{"id":11467,"date":"2025-04-18T18:44:06","date_gmt":"2025-04-18T10:44:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/11467.html"},"modified":"2025-04-18T18:44:06","modified_gmt":"2025-04-18T10:44:06","slug":"%e3%80%90linux%e5%ae%9e%e8%b7%b5%e7%b3%bb%e5%88%97%e3%80%91%ef%bc%9a%e5%8c%bf%e5%90%8d%e7%ae%a1%e9%81%93%e6%94%b6%e5%b0%be%e5%ae%8c%e5%96%84shell%e5%a4%96%e5%a3%b3%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/11467.html","title":{"rendered":"\u3010Linux\u5b9e\u8df5\u7cfb\u5217\u3011\uff1a\u533f\u540d\u7ba1\u9053\u6536\u5c3e+\u5b8c\u5584shell\u5916\u58f3\u7a0b\u5e8f"},"content":{"rendered":"

🔥 \u672c\u6587\u4e13\u680f：Linux Linux\u5b9e\u8df5\u9879\u76ee 🌸\u4f5c\u8005\u4e3b\u9875：\u52aa\u529b\u52aa\u529b\u518d\u52aa\u529bwz<\/p>\n

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\n

1.\u5185\u5bb9\u56de\u987e<\/h2>\n

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2.Linux\u7684\u533f\u540d\u7ba1\u9053\u6307\u4ee4<\/h2>\n

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cmd1 |<\/span> cmd2<\/p>\n

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3.\u5b8c\u5584shell\u5916\u58f3\u7a0b\u5e8f<\/h2>\n

(1).\u6574\u4f53\u6846\u67b6<\/h3>\n

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1.\u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u5b57\u7b26\u4e32<\/h4>\n

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\n

2.\u89e3\u6790\u5b57\u7b26\u4e32<\/h4>\n

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\n

3.\u5224\u65ad\u6307\u4ee4\u4e2a\u6570<\/h4>\n

\u90a3\u4e48\u5728\u4e0a\u4e00\u4e2a\u73af\u8282\u6211\u4eec\u4f1a\u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570，\u662f\u96f6\u4e2a\u8fd8\u662f\u4e24\u4e2a\u8fd8\u662f4\u4e2a，\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u8981\u5224\u65ad，\u5982\u679c\u662f\u96f6\u4e2a\u57fa\u672c\u6307\u4ee4，\u90a3\u4e48\u4ee3\u8868\u7528\u6237\u5c31\u53ea\u662f\u6572\u4e86\u4e00\u4e2a\u56de\u8f66\u952e，\u610f\u5473\u7740\u6ca1\u6709\u8f93\u5165\u4efb\u4f55\u76f8\u5173\u5185\u5bb9，\u90a3\u4e48\u6b64\u65f6\u5c31\u5f97\u56de\u5230\u5f00\u5934\u7684\u7b2c\u4e00\u6b65，\u800c\u5230\u65f6\u5019\u8fd9\u6240\u6709\u7684\u6a21\u5757\u4f1a\u5904\u4e8e\u4e00\u4e2a\u6b7b\u5faa\u73af\u7684\u903b\u8f91，\u90a3\u4e48\u8fd9\u91cc\u5982\u679c\u6307\u4ee4\u4e2a\u6570\u4e3a0，\u90a3\u4e48\u5c31\u4f1acontinue\u56de\u5230\u5f00\u5934\u7684\u7b2c\u4e00\u6b65\u53bb\u7ee7\u7eed\u83b7\u53d6\u7528\u6237\u4e0b\u4e00\u6b21\u7684\u8f93\u5165，\u90a3\u4e48\u5982\u679c\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u4e2a\u6570\u4e3a1\u4e2a，\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u5f97\u5224\u65ad\u7528\u6237\u8f93\u5165\u7684\u6307\u4ee4\u662f\u5185\u7f6e\u6307\u4ee4\u8fd8\u662f\u5916\u90e8\u547d\u4ee4，\u90a3\u4e48\u5982\u679c\u662f\u5185\u7f6e\u6307\u4ee4\u5219\u4e0d\u9700\u8981\u8c03\u7528fork\u63a5\u53e3\u521b\u5efa\u5b50\u8fdb\u7a0b\u6765\u6267\u884c，\u800c\u5982\u679c\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570\u5927\u4e8e1，\u90a3\u4e48\u7528\u6237\u5fc5\u5b9a\u8f93\u5165\u4e86\u7ba1\u9053\u7b26\u8fdb\u884c\u4e86\u5206\u5272，\u90a3\u4e48\u8fd9\u91cc\u5c31\u8981\u6267\u884c\u5173\u4e8e\u7ba1\u9053\u76f8\u5173\u7684\u5904\u7406\u903b\u8f91\u4e86<\/p>\n

\n

4.\u6307\u4ee4\u7684\u6267\u884c<\/h4>\n

\u90a3\u4e48\u8fd9\u91cc\u6307\u4ee4\u7684\u6267\u884c\u7684\u524d\u63d0\u4e00\u5b9a\u662f\u6709\u6307\u4ee4，\u4e5f\u5c31\u662f\u6307\u4ee4\u7684\u4e2a\u6570\u5927\u4e8e\u7b49\u4e8e1，\u90a3\u4e48\u6307\u4ee4\u7684\u4e2a\u6570\u7b49\u4e8e1,\u5982\u4f55\u6267\u884c，\u90a3\u4e48\u4e0a\u6587\u7b2c\u4e09\u4e2a\u73af\u8282\u8bf4\u8fc7，\u8fd9\u91cc\u5c31\u4e0d\u5728\u91cd\u590d，\u800c\u5982\u679c\u6307\u4ee4\u7684\u4e2a\u6570\u5927\u4e8e1，\u90a3\u4e48\u5fc5\u5b9a\u6d89\u53ca\u5230\u7ba1\u9053，\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u5f97\u4e13\u95e8\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u6a21\u5757\u6765\u6267\u884c\u5404\u4e2a\u57fa\u672c\u6307\u4ee4\u4ee5\u53ca\u8981\u5b9e\u73b0\u8fd9\u4e9b\u57fa\u672c\u6307\u4ee4\u901a\u8fc7\u7ba1\u9053\u6765\u4f20\u8f93\u5185\u5bb9，\u4e5f\u5c31\u662f\u901a\u8fc7\u8f93\u51fa\u91cd\u5b9a\u5411\u6765\u5b9e\u73b0<\/p>\n

\n

\u90a3\u4e48\u8fd9\u5c31\u662f\u6211\u4eecshell\u5916\u58f3\u7a0b\u5e8f\u7684\u4e00\u4e2a\u5927\u81f4\u7684\u6267\u884c\u601d\u8def，\u90a3\u4e48\u68b3\u7406\u6e05\u695a\u4e4b\u540e，\u6211\u4eec\u5c31\u8981\u843d\u5b9e\u5230\u6bcf\u4e00\u4e2a\u6a21\u5757\u5982\u4f55\u53bb\u5b9e\u73b0，\u4ee5\u53ca\u8981\u6ce8\u610f\u7684\u4e00\u4e9b\u5b9e\u73b0\u7ec6\u8282 \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

(2).\u5177\u4f53\u6a21\u5757\u5b9e\u73b0<\/h3>\n

1.\u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u5b57\u7b26\u4e32<\/h4>\n

\u90a3\u4e48\u5e73\u5e38\u6211\u4eec\u83b7\u53d6\u7528\u6237\u7684\u952e\u76d8\u8f93\u5165\u7684\u8bdd，\u91c7\u53d6\u7684\u51fd\u6570\u90fd\u662fscanf\u51fd\u6570\u6765\u83b7\u53d6\u7528\u6237\u7684\u8f93\u5165，\u4f46\u662f\u8fd9\u91cc\u7531\u4e8e\u7528\u6237\u5728\u8f93\u5165\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u7684\u65f6\u5019，\u90a3\u4e48\u6709\u610f\u601d\u7684\u624b\u52a8\u6dfb\u52a0\u7a7a\u683c\u5c06\u57fa\u672c\u6307\u4ee4\u7684\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u9694\u5f00，\u800cscanf\u8bfb\u53d6\u5230\u7a7a\u683c\u65f6，\u4fbf\u505c\u6b62\u8bfb\u53d6\u8f93\u5165\u4e86，\u90a3\u4e48\u65e0\u6cd5\u83b7\u53d6\u7528\u6237\u5b8c\u6574\u8f93\u5165\u7684\u5b57\u7b26\u4e32，\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u4e0d\u80fd\u91c7\u53d6scanf\u51fd\u6570\u6765\u83b7\u53d6\u7528\u6237\u7684\u8f93\u5165，\u800c\u662f\u5e94\u8be5\u91c7\u53d6fgets\u51fd\u6570，\u90a3\u4e48\u5b83\u4f1a\u8bfb\u53d6\u5305\u62ec\u7a7a\u683c\u7684\u8fde\u7eed\u5b57\u7b26，\u9047\u5230\u6362\u884c\u7b26\u505c\u6b62\u8bfb\u53d6，\u6240\u4ee5\u8fd9\u91cc\u5728\u5b9e\u73b0\u7684\u65f6\u5019，\u6ce8\u610f\u4e00\u5b9a\u4e0d\u80fd\u9009\u62e9scanf\u6765\u8bfb\u53d6<\/p>\n

\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u8c03\u7528fegts\u51fd\u6570\u5219\u662f\u4ece\u6807\u51c6\u8f93\u5165\u6d41\u4e2d，\u8bfb\u53d6\u6307\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32，\u7136\u540e\u4fdd\u5b58\u5230\u4e00\u4e2a\u4e34\u65f6\u7684temp\u5b57\u7b26\u6570\u7ec4\u4e2d<\/p>\n

char<\/span> temp[<\/span>MAX_SIZE]<\/span>;<\/span>
\nif<\/span>(<\/span>fgets<\/span>(<\/span>temp,<\/span>sizeof<\/span>(<\/span>temp)<\/span>,<\/span>stdin<\/span>)<\/span>==<\/span>NULL<\/span>)<\/span>
\n{<\/span>
\nperror<\/span>(<\/span>"fgets"<\/span>)<\/span>;<\/span>
\ncontinue<\/span>;<\/span>
\n}<\/span><\/p>\n

2.\u89e3\u6790\u5b57\u7b26\u4e32<\/h4>\n

\u800c\u6211\u4eec\u77e5\u9053\u7528\u6237\u8f93\u5165\u7684\u57fa\u672c\u6307\u4ee4\u53ef\u80fd\u4e0d\u6b62\u4e00\u4e2a，\u56e0\u4e3a\u6709\u7ba1\u9053\u7684\u5b58\u5728，\u5e76\u4e14\u6211\u4eec\u8fd8\u5f97\u83b7\u53d6\u5176\u4e2d\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u7684\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206，\u4ee5\u53ca\u5b83\u662f\u5426\u6709\u8f93\u5165\u6216\u8005\u8f93\u51fa\u91cd\u5b9a\u5411，\u5982\u679c\u6709\u7684\u8bdd，\u6211\u4eec\u8fd8\u5f97\u4fdd\u5b58\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u7684\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u540d，\u90a3\u4e48\u6240\u4ee5\u6211\u4eec\u5f97\u91c7\u53d6\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\u6765\u4fdd\u5b58\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u4ee5\u53ca\u5176\u5bf9\u5e94\u7684\u8fd9\u5404\u79cd\u5c5e\u6027，\u6240\u4ee5\u8fd9\u91cc\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u5bf9\u8c61\u6216\u8005\u7ed3\u6784\u4f53，\u5176\u4e2d\u5c01\u88c5\u4e00\u4e2a\u5b57\u7b26\u6307\u9488\u6570\u7ec4 _ argv，\u90a3\u4e48\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u6307\u9488，\u5bf9\u5e94\u8be5\u57fa\u672c\u6307\u4ee4\u7684\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u7684\u5b57\u7b26\u4e32，\u7136\u540e\u5c31\u662f\u4e00\u4e2a\u5305\u62ec\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u7684\u53c2\u6570\u603b\u4e2a\u6570 _ argc,\u4ee5\u53ca\u4e00\u4e2a\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u7684\u6807\u8bb0\u4f4d_check_redir，\u90a3\u4e48\u5b83\u662f\u4e00\u4e2aint\u7c7b\u578b\u7684\u53d8\u91cf，\u5982\u679c\u8be5\u57fa\u672c\u6307\u4ee4\u6d89\u53ca\u5230\u8f93\u51fa\u91cd\u5b9a\u5411，\u90a3\u4e48\u5b83\u7684\u503c\u5c31\u4f1a\u88ab\u8bbe\u7f6e\u4e3a1，\u8ffd\u52a0\u91cd\u5b9a\u5411\u5176\u503c\u4f1a\u88ab\u8bbe\u7f6e\u4e3a2，\u800c\u5982\u679c\u662f\u8f93\u5165\u91cd\u5b9a\u5411\u5176\u503c\u4f1a\u88ab\u8bbe\u7f6e\u4e3a3，\u800c\u6ca1\u6709\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411，\u90a3\u4e48\u5b83\u7684\u503c\u5c31\u662f0，\u800c\u8be5\u5bf9\u8c61\u6216\u8005\u7ed3\u6784\u4f53\u8fd8\u4f1a\u5c01\u88c5\u4e00\u4e2a\u5b57\u7b26\u6307\u9488filename，\u6307\u5411\u4e00\u4e2a\u5b57\u7b26\u4e32，\u5982\u679c\u6709\u8f93\u5165\u6216\u8005\u8f93\u51fa\u91cd\u5b9a\u5411，\u90a3\u4e48\u5b83\u4fdd\u5b58\u7684\u5c31\u662f\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u7684\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u540d<\/p>\n

\u800c\u8fd9\u91cc\u6211\u662f\u91c7\u53d6c++\u7684\u7c7b\u6765\u5b9e\u73b0\u7684：<\/p>\n

class<\/span> order<\/span><\/p>\n

{<\/span><\/p>\n

public<\/span>:<\/span><\/p>\n

char<\/span>*<\/span> _argv[<\/span>MAX_SIZE]<\/span>;<\/span><\/p>\n

int<\/span> _argc=<\/span>0<\/span>;<\/span><\/p>\n

int<\/span> _check_redir=<\/span>0<\/span>;<\/span><\/p>\n

char<\/span>*<\/span> filename=<\/span>nullptr<\/span>;<\/span><\/p>\n

}<\/span>;<\/span><\/p>\n

\u7136\u540e\u518d\u5b57\u7b26\u4e32\u89e3\u6790\u4e4b\u524d，\u6211\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684vector\u6570\u7ec4，\u5176\u4e2d\u6bcf\u4e00\u4e2a\u5143\u7d20\u662forder\u7c7b，\u901a\u8fc7vector\u6765\u4fdd\u5b58\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u4ee5\u53ca\u5176\u5bf9\u5e94\u7684\u8fd9\u5404\u79cd\u5c5e\u6027，\u90a3\u4e48\u521b\u5efa\u5b8c\u7136\u540e\u4ea4\u7ed9\u5b57\u7b26\u4e32\u89e3\u6790\u51fd\u6570\u53bb\u8fdb\u884c\u521d\u59cb\u5316<\/p>\n

\u800c\u5bf9\u4e8e\u5b57\u7b26\u4e32\u89e3\u6790\u51fd\u6570\u6a21\u5757\u5185\u90e8\u7684\u5b9e\u73b0，\u90a3\u4e48\u9996\u5148\u6211\u4eec\u9700\u8981\u8c03\u7528strtok\u51fd\u6570，\u90a3\u4e48\u4ee5\u7ba1\u9053\u7b26(|)\u4f5c\u4e3a\u5206\u9694\u7b26\u6765\u5206\u5272\u51fa\u4e00\u4e2a\u4e2a\u7684\u57fa\u672c\u6307\u4ee4，\u90a3\u4e48\u8fd9\u4e9b\u57fa\u672c\u6307\u4ee4\u6211\u4eec\u5148\u4fdd\u5b58\u5728\u4e34\u65f6\u7684\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e2d，\u90a3\u4e48\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u6211\u4eec\u987a\u4fbf\u53ef\u4ee5\u7edf\u8ba1\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570，\u5e76\u4e14\u8be5\u51fd\u6570\u8c03\u7528\u7ed3\u675f\u5c31\u8fd4\u56de\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570\u4ea4\u7ed9\u5916\u90e8\u4e3b\u51fd\u6570\u63a5\u6536<\/p>\n

int<\/span> pipe_string<\/span>(<\/span>std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span>char<\/span> temp[<\/span>]<\/span>)<\/span>
\n {<\/span>
\n int<\/span> cmdnum=<\/span>0<\/span>;<\/span>
\n char<\/span>*<\/span> tmp[<\/span>MAX_SIZE]<\/span>;<\/span>
\n char<\/span>*<\/span> token=<\/span>strtok<\/span>(<\/span>temp,<\/span>"|"<\/span>)<\/span>;<\/span>
\n while<\/span>(<\/span>token!=<\/span>NULL<\/span>&&<\/span>cmdnum<<\/span>MAX_SIZE)<\/span>
\n {<\/span>
\n tmp[<\/span>cmdnum]<\/span>=<\/span>token;<\/span>
\n cmdnum++<\/span>;<\/span>
\n token=<\/span>strtok<\/span>(<\/span>NULL<\/span>,<\/span>"|"<\/span>)<\/span>;<\/span>
\n }<\/span>
\n for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>;<\/span>i<<\/span>cmdnum;<\/span>i++<\/span>)<\/span>
\n {<\/span>
\n get_string<\/span>(<\/span>order_array[<\/span>i]<\/span>,<\/span>tmp[<\/span>i]<\/span>)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> cmdnum;<\/span>
\n }<\/span><\/p>\n

\u63a5\u7740\u6211\u4eec\u5728\u5bf9\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u8fdb\u884c\u5206\u5272，\u5176\u4e2d\u4f1a\u4e13\u95e8\u521b\u5efa\u4e00\u4e2a\u51fd\u6570get_string\u6765\u5b9e\u73b0\u8fd9\u4e2a\u5185\u5bb9，\u5e76\u4e14\u5176\u4f1a\u63a5\u6536\u4e00\u4e2avector\u6570\u7ec4\u4e2d\u7684\u4e00\u4e2aorder\u5bf9\u8c61\u4ee5\u53ca\u4e00\u4e2a\u6307\u5411\u57fa\u672c\u6307\u4ee4\u5bf9\u5e94\u7684\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u6307\u9488，\u7136\u540e\u8c03\u7528strtok\u51fd\u6570，\u4ee5\u7a7a\u683c\u4f5c\u4e3a\u5206\u5272\u7b26，\u5c06\u5206\u5272\u51fa\u6765\u7684\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u7684\u5b57\u7b26\u4e32\u4fdd\u5b58\u5230order\u5bf9\u8c61\u4e2d\u7684_ argv\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e2d,\u5176\u4e2d\u6ce8\u610f _ argv\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u8981\u8bbe\u7f6e\u4e3aNULL，\u56e0\u4e3a\u5728\u540e\u9762\u5982\u679c\u8981\u8fdb\u884c\u8fdb\u7a0b\u7684\u66ff\u6362，\u5176\u4e2d\u5c31\u6d89\u53ca\u5230\u8c03\u7528exec\u51fd\u6570，\u90a3\u4e48\u8be5\u51fd\u6570\u4f1a\u63a5\u6536\u4fdd\u5b58\u57fa\u672c\u6307\u4ee4\u7684\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u7684\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e5f\u5c31\u662f_argv，\u90a3\u4e48\u8be5\u51fd\u6570\u4f1a\u89e3\u6790\u8be5\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4ece\u800c\u8ba1\u7b97\u51fa\u53c2\u6570\u4e2a\u6570\u7136\u540e\u4ea4\u7ed9\u66ff\u6362\u540e\u7684\u8fdb\u7a0b\u7684main\u51fd\u6570，\u90a3\u4e48\u5b83\u4f1a\u904d\u5386\u8be5\u5b57\u7b26\u6307\u9488\u6570\u7ec4，\u76f4\u5230\u9047\u5230NULL\u7ed3\u675f，\u6240\u4ee5\u6211\u4eec\u4e00\u5b9a\u8981\u5728\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e2d\u663e\u793a\u7684\u8bbe\u7f6e\u4ee5NULL\u7ed3\u5c3e<\/p>\n

\u63a5\u4e0b\u6765\u8fd8\u4f1a\u5224\u65ad\u662f\u5426\u6709\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u7b26\u53f7，\u90a3\u4e48\u5c31\u4f1a\u6d89\u53ca\u5230\u904d\u5386\u8fd9\u4e2a_ argv\u6570\u7ec4，\u5e76\u4e14\u662f\u4ece\u540e\u5f80\u524d\u904d\u5386，\u56e0\u4e3a\u6211\u4eec\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u89c4\u5b9a\u662f\u91cd\u5b9a\u5411\u7b26\u53f7\u540e\u9762\u7684\u5b57\u7b26\u4e32\u662f\u91cd\u5b9a\u5411\u7684\u6587\u4ef6\u540d，\u90a3\u4e48\u5176\u4e2d\u6211\u4eec\u4f1a\u8c03\u7528strcmp\u51fd\u6570\u6765\u5339\u914d\u53c2\u6570\u90e8\u5206\u7684\u5b57\u7b26\u4e32\u662f\u5426\u662f\u91cd\u5b9a\u5411\u7b26\u53f7，\u8fd9\u91cc\u6ce8\u610f\u6211\u4eec\u53ea\u80fd\u4ece\u5012\u6570\u7b2c\u4e8c\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u5f80\u524d\u5339\u914d，\u56e0\u4e3a\u5012\u6570\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u7684\u503c\u662fNULL，\u6700\u540e\u6839\u636e\u5339\u914d\u7684\u91cd\u5b9a\u5411\u7b26\u53f7\u6765\u521d\u59cb\u5316order\u5bf9\u8c61\u7684 _chekc _redir\u53d8\u91cf<\/p>\n

\u5176\u4e2d\u8fd8\u8981\u6ce8\u610f\u7684\u662f，\u91cd\u5b9a\u5411\u7b26\u53f7\u4ee5\u53ca\u540e\u9762\u91cd\u5b9a\u5411\u7684\u76ee\u6807\u6587\u4ef6\u5e76\u4e0d\u662f\u6307\u4ee4\u7684\u6709\u6548\u5185\u5bb9，\u90a3\u4e48\u6211\u4eec\u5f97\u624b\u52a8\u5c06\u6307\u5411\u8fd9\u4e24\u90e8\u5206\u7684\u5b57\u7b26\u6307\u9488\u8bbe\u7f6e\u4e3aNULL，\u4f46\u662f\u5728\u8bbe\u7f6e\u4e3aNULL\u4e4b\u524d，\u4e00\u5b9a\u8981\u4fdd\u5b58\u91cd\u5b9a\u5411\u7684\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u540d\u4e5f\u5c31\u662f\u521d\u59cb\u5316order\u5bf9\u8c61\u7684filename\u6210\u5458\u53d8\u91cf，\u5e76\u4e14\u7531\u4e8e\u91cd\u5b9a\u5411\u7684\u7b26\u53f7\u4ee5\u53ca\u6587\u4ef6\u540d\u4e0d\u662f\u6709\u6548\u6307\u4ee4\u5185\u5bb9，\u6240\u4ee5\u6700\u540e\u5728\u5224\u65ad\u91cd\u5b9a\u5411\u7ed3\u675f\u4e4b\u540e，\u6211\u4eec\u8981\u518d\u6700\u540e\u7edf\u8ba1\u6307\u4ee4\u90e8\u5206\u4ee5\u53ca\u53c2\u6570\u90e8\u5206\u7684\u603b\u4e2a\u6570，\u90a3\u4e48\u5176\u4e2d\u5c31\u662f\u4ece\u524d\u5f80\u540e\u904d\u5386，\u56e0\u4e3a\u91cd\u5b9a\u5411\u7b26\u53f7\u7684\u5b57\u7b26\u6307\u9488\u5df2\u7ecf\u88ab\u8bbe\u7f6e\u4e3a\u7a7a\u4e86，\u90a3\u4e48\u6211\u4eec\u91c7\u53d6\u4e00\u4e2awhile\u5faa\u73af\u7684\u903b\u8f91，\u6bcf\u6b21\u904d\u5386\u662forder\u5bf9\u8c61\u7684_ argc\u52a0\u4e00，\u76f4\u5230\u904d\u5386\u5e26 _ agrv\u7684\u5b57\u7b26\u6307\u9488\u4e3aNULL\u7ed3\u675f<\/p>\n

\/\/\u89e3\u6790\u57fa\u672c\u6307\u4ee4<\/span>
\nvoid<\/span> get_string<\/span>(<\/span>order&<\/span> a,<\/span>char<\/span>*<\/span> temp_order)<\/span>
\n{<\/span>
\nint<\/span> len=<\/span>strlen<\/span>(<\/span>temp_order)<\/span>;<\/span>
\nif<\/span>(<\/span>len><\/span>0<\/span>&&<\/span>temp_order[<\/span>len–<\/span>1<\/span>]<\/span>==<\/span>'\\\\n'<\/span>)<\/span>
\n{<\/span>
\ntemp_order[<\/span>len–<\/span>1<\/span>]<\/span>=<\/span>'\\\\0'<\/span>;<\/span>
\n}<\/span>
\nchar<\/span>*<\/span> token=<\/span>strtok<\/span>(<\/span>temp_order,<\/span>" "<\/span>)<\/span>;<\/span>
\nint<\/span> argc=<\/span>0<\/span>;<\/span>
\nwhile<\/span>(<\/span>token!=<\/span>NULL<\/span>&&<\/span>argc<<\/span>MAX_SIZE)<\/span>
\n{<\/span>
\na.<\/span>_argv[<\/span>argc++<\/span>]<\/span>=<\/span>token;<\/span>
\ntoken=<\/span>strtok<\/span>(<\/span>NULL<\/span>,<\/span>" "<\/span>)<\/span>;<\/span>
\n}<\/span>
\na.<\/span>_argv[<\/span>argc]<\/span>=<\/span>NULL<\/span>;<\/span>
\na.<\/span>_argc=<\/span>0<\/span>;<\/span>
\nfor<\/span>(<\/span>int<\/span> i=<\/span>argc–<\/span>2<\/span>;<\/span>i>=<\/span>0<\/span>;<\/span>i—<\/span>)<\/span>
\n{<\/span>
\nif<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>">"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n{<\/span>
\na.<\/span>_check_redir=<\/span>1<\/span>;<\/span>
\nif<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\na.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\na.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\na.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n}<\/span>
\nbreak<\/span>;<\/span>
\n}<\/span>else<\/span> if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>">>"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n a.<\/span>_check_redir=<\/span>2<\/span>;<\/span>
\n if<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\n a.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n }<\/span>
\n break<\/span>;<\/span>
\n }<\/span>else<\/span> if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>"<"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n a.<\/span>_check_redir=<\/span>3<\/span>;<\/span>
\n if<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\n a.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n }<\/span>
\n break<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n while<\/span>(<\/span>a.<\/span>_argv[<\/span>a.<\/span>_argc]<\/span>!=<\/span>NULL<\/span>&&<\/span>a.<\/span>argc<<\/span>MAX_SIZE)<\/span>
\n {<\/span>
\n a.<\/span>_argc++<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\u6ce8\u610f\u8fd9\u91cc\u6709\u4e00\u4e2a\u5751，\u4f60\u4f1a\u53d1\u73b0\u6211\u8fd9\u91cc\u5728\u5b9e\u73b0pipe_string\u51fd\u6570\u7684\u65f6\u5019，\u90a3\u4e48\u6211\u91c7\u53d6\u7684\u65b9\u5f0f\u662f\u4f1a\u5148\u5206\u5272\u51fa\u6240\u6709\u7684\u57fa\u672c\u6307\u4ee4，\u7136\u540e\u5c06\u5176\u4fdd\u5b58\u5728\u4e00\u4e2a\u4e34\u65f6\u7684\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e2d，\u5206\u5272\u5b8c\u6240\u6709\u7684\u57fa\u672c\u6307\u4ee4\u5728\u5bf9\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u89e3\u6790，\u800c\u5e76\u6ca1\u6709\u91c7\u53d6\u5206\u5272\u51fa\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u4e4b\u540e\u5c31\u76f4\u63a5\u5c06\u8fd9\u4e2a\u57fa\u672c\u6307\u4ee4\u89e3\u6790\u7136\u540e\u521d\u59cb\u5316vector\u6570\u7ec4\u4e2d\u7684\u4e00\u4e2aorder\u5bf9\u8c61：<\/p>\n

while<\/span>(<\/span>token!=<\/span>NULL<\/span>&&<\/span>cmdnum<<\/span>MAX_SIZE)<\/span>
\n {<\/span>
\n get_string<\/span>(<\/span>order_array[<\/span>i]<\/span>,<\/span>token)<\/span>;<\/span>
\n cmdnum++<\/span>;<\/span>
\n token=<\/span>strtok<\/span>(<\/span>NULL<\/span>,<\/span>"|"<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\u90a3\u4e48\u9996\u5148\u7ed9\u51fa\u4e00\u4e2a\u7b54\u6848，\u8fd9\u79cd\u65b9\u5f0f\u80af\u5b9a\u662f\u9519\u8bef\u7684，\u90a3\u4e48\u4e3a\u4ec0\u4e48\u662f\u9519\u8bef\u7684？<\/p>\n

\u90a3\u4e48\u8fd9\u5c31\u548cstrtok\u51fd\u6570\u6709\u5173，\u56e0\u4e3astrtok\u51fd\u6570\u88ab\u8c03\u7528\u7684\u65f6\u5019，\u90a3\u4e48\u5185\u90e8\u4e3a\u7ef4\u62a4\u4e00\u4e2a\u9759\u6001\u7684\u6307\u9488，\u6307\u5411\u8981\u4e0b\u4e00\u6b21\u5206\u5272\u7684\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e，\u90a3\u4e48\u6b64\u65f6\u6211\u4eec\u6700\u5f00\u59cb\u5728pipe_string\u8c03\u7528strtok\u51fd\u6570,\u7136\u540e\u57fa\u672c\u6307\u4ee4\u8fd8\u6ca1\u5206\u5272\u5b8c，\u5c31\u63a5\u7740\u5728get_string\u51fd\u6570\u4e2d\u53c8\u518d\u4e00\u6b21\u8c03\u7528strtok\u51fd\u6570，\u90a3\u4e48\u6b64\u65f6\u5b83\u4f1a\u8986\u76d6\u4e4b\u524d\u7684\u9759\u6001\u6307\u9488，\u7136\u540e\u6307\u5411\u65b0\u7684\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e\u5f00\u59cb\u5f80\u540e\u5206\u5272，\u7b49\u5230get_string\u8c03\u7528\u7ed3\u675f，\u90a3\u4e48\u6b64\u65f6strtok\u5185\u90e8\u7ef4\u62a4\u7684\u9759\u6001\u7684\u6307\u9488\u5df2\u7ecf\u6307\u5411\u4e86\u5b57\u7b26\u4e32\u7ed3\u5c3e，\u90a3\u4e48\u6b64\u65f6\u5b83\u4f1a\u8fd4\u56deNULL，\u90a3\u4e48\u6839\u636e\u6b64\u65f6while\u5faa\u73af\u7684\u5faa\u73af\u8c03\u8282，\u90a3\u4e48\u4f1a\u5bfc\u81f4\u76f4\u63a5\u9000\u51fa\u5faa\u73af，\u4e0d\u4f1a\u7ee7\u7eed\u5206\u5272\u57fa\u672c\u6307\u4ee4，\u90a3\u4e48\u4f60\u4f1a\u53d1\u73b0\u65e0\u8bba\u4f60\u8f93\u5165\u591a\u5c11\u4e2a\u5e26\u6709\u7ba1\u9053\u7684\u57fa\u672c\u6307\u4ee4，\u6700\u7ec8\u53ea\u4f1a\u4fdd\u5b58\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4，\u4e5f\u5c31\u662f\u7b2c\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4，\u90a3\u4e48\u6211\u4e4b\u524d\u5c31\u662f\u8fd9\u4e48\u505a\u7684，\u53ef\u8c13\u628a\u6211\u7ed9\u5751\u60e8\u4e86，\u90a3\u4e48\u8fd9\u91cc\u63d0\u9192\u8bfb\u8005\u4e0d\u8981\u8df3\u8fdb\u8fd9\u5751\u91cc\u9762，\u90a3\u4e48\u8fd9\u662f\u975e\u5e38\u5173\u952e\u7684\u7ec6\u8282<\/p>\n

3.\u5224\u65ad\u6307\u4ee4\u4e2a\u6570<\/h4>\n

\u90a3\u4e48\u63a5\u4e0b\u6765\u5c31\u662f\u5224\u65ad\u6307\u4ee4\u7684\u4e2a\u6570，\u5982\u679c\u6307\u4ee4\u7684\u4e2a\u6570\u4e3a0，\u90a3\u4e48\u5c31\u4f1a\u7ee7\u7eed\u56de\u5230\u8d77\u59cb\u4f4d\u7f6e\u5904，\u800c\u5982\u679c\u6307\u4ee4\u4e2a\u6570\u4e3a1，\u90a3\u4e48\u6211\u4eec\u5c31\u5f97\u518d\u5224\u65ad\u5b83\u662f\u5426\u4e3a\u5185\u5efa\u6307\u4ee4，\u90a3\u4e48\u6240\u8c13\u7684\u5185\u5efa\u6307\u4ee4，\u5c31\u662f\u8be5\u6307\u4ee4\u7684\u5185\u5bb9\u548c\u7236\u8fdb\u7a0b\u6240\u5904\u7684\u8fd0\u884c\u73af\u5883\u6709\u5173，\u6bd4\u5982cd\u6307\u4ee4，cd\u6307\u4ee4\u7684\u5185\u5bb9\u662f\u8981\u66f4\u6362\u7528\u6237\u6216\u8005\u8bf4\u662f\u7236\u8fdb\u7a0bbash\u6240\u5904\u7684\u5de5\u4f5c\u76ee\u5f55，\u90a3\u4e48\u5982\u679c\u4f60\u4ea4\u7ed9\u5b50\u8fdb\u7a0b，\u90a3\u4e48\u5b50\u8fdb\u7a0b\u4f1a\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u4e00\u4efd\u73af\u5883\u53d8\u91cf，\u90a3\u4e48\u5b83\u7684\u5de5\u4f5c\u76ee\u5f55\u7684\u66f4\u6539\u4e0d\u5f71\u54cd\u7236\u8fdb\u7a0b，\u6240\u4ee5\u50cf\u8fd9\u6837\u7684\u6307\u4ee4\u5c31\u662f\u5185\u7f6e\u6307\u4ee4，\u4e00\u5b9a\u5f97\u4ea4\u7ed9\u7236\u8fdb\u7a0b\u6765\u5b8c\u6210，\u90a3\u4e48\u6211\u4eec\u5c31\u5f97\u51c6\u5907\u4e00\u4e2a\u5168\u5c40\u7684\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u6765\u4fdd\u5b58\u5185\u7f6e\u6307\u4ee4\u5bf9\u5e94\u7684\u5b57\u7b26\u4e32，\u800corder\u5bf9\u8c61\u4e2d\u7684_argv\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u4fbf\u662f\u6307\u4ee4\u90e8\u5206，\u90a3\u4e48\u6211\u4eec\u4fbf\u4f1a\u53bb\u548c\u4fdd\u5b58\u5185\u7f6e\u6307\u4ee4\u7684\u5b57\u7b26\u6307\u9488\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u4f9d\u6b21\u53bb\u5339\u914d\u770b\u662f\u5426\u4e3a\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u8fd9\u4e2a\u8fc7\u7a0b\u4f1a\u6d89\u53ca\u8c03\u7528strcmp\u51fd\u6570，\u5e76\u4e14\u5c06\u5176\u5c01\u88c5\u5230check _ order\u51fd\u6570\u4e2d<\/p>\n

const<\/span> char<\/span>*<\/span> in_cmd[<\/span>]<\/span>=<\/span>{<\/span>"cd"<\/span>,<\/span>"pwd"<\/span>,<\/span>"NULL"<\/span>}<\/span>;<\/span>
\n\/\/\u5224\u65ad\u5185\u7f6e\u6307\u4ee4<\/span>
\n bool<\/span> check_order<\/span>(<\/span>order&<\/span> a)<\/span>
\n {<\/span>
\n for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>;<\/span>in_cmd[<\/span>i]<\/span>!=<\/span>NULL<\/span>;<\/span>i++<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>in_cmd[<\/span>i]<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n return<\/span> true<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n return<\/span> false<\/span>;<\/span>
\n }<\/span><\/p>\n

\u90a3\u4e48\u5982\u679c\u8c03\u7528check_order\u51fd\u6570\u8fd4\u56de\u4e3atrue，\u90a3\u4e48\u5c31\u610f\u5473\u7740\u5176\u662f\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u4fbf\u4f1a\u7531\u7236\u8fdb\u7a0b\u53bb\u4eb2\u81ea\u6267\u884c，\u90a3\u4e48\u6240\u8c13\u7684\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u610f\u5473\u7740\u8be5\u6307\u4ee4\u7684\u5185\u5bb9\u4f1a\u88ab\u5c01\u88c5\u4e3a\u4e86\u4e00\u4e2a\u6a21\u5757\u5316\u7684\u51fd\u6570，\u90a3\u4e48\u6211\u8fd9\u91cc\u5728\u5b9e\u73b0\u7684\u65f6\u5019\u53ea\u6d89\u53ca\u5230cd\u4ee5\u53capwd\u4e24\u4e2a\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u8bfb\u8005\u53ef\u4ee5\u8bd5\u7740\u5c1d\u8bd5\u6dfb\u52a0\u66f4\u591a\u7684\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u5185\u7f6e\u6307\u4ee4\u7684\u5bf9\u5e94\u7684\u51fd\u6570\u8c03\u7528，\u90a3\u4e48\u6211\u5c06\u5176\u5c01\u88c5\u5230\u4e86in_order_complete\u51fd\u6570\u4e2d<\/p>\n

void<\/span> in_order_complete<\/span>(<\/span>order&<\/span> a)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>"cd"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_argc==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>chdir<\/span>(<\/span>a.<\/span>_argv[<\/span>1<\/span>]<\/span>)<\/span>!=<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"chdir"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>else<\/span>
\n {<\/span>
\n std::<\/span>cout<<<\/span>"the order is not right"<\/span><<<\/span>std::<\/span>endl;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>"pwd"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n char<\/span> cwd[<\/span>1024<\/span>]<\/span>;<\/span>
\n if<\/span>(<\/span>getcwd<\/span>(<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>!=<\/span>NULL<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>1<\/span>||<\/span>a.<\/span>_check_redir==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>1<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>a.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>write<\/span>(<\/span>_fd,<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"write"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>else<\/span> if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>a.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY|<\/span>O_APPEND,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>write<\/span>(<\/span>_fd,<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"write"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

}<\/span>else<\/span>
\n {<\/span>
\n std::<\/span>cout<<<\/span>cwd<<<\/span>std::<\/span>endl;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

4.\u6307\u4ee4\u7684\u6267\u884c<\/h4>\n

\u90a3\u4e48\u521a\u624d\u6307\u4ee4\u4e2a\u6570\u4e3a1，\u5982\u4f55\u6267\u884c\u4ee5\u53ca\u5176\u5404\u79cd\u7ec6\u8282\u5728\u4e0a\u6587\u5df2\u7ecf\u8bf4\u660e，\u800c\u5982\u679c\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570\u5927\u4e8e1，\u90a3\u4e48\u5219\u8bf4\u660e\u6709\u7ba1\u9053，\u90a3\u4e48\u5bf9\u4e8e\u542b\u6709\u7ba1\u9053\u7684\u591a\u4e2a\u57fa\u672c\u6307\u4ee4\u7684\u6267\u884c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a pipe_order_complete\u51fd\u6570\u6765\u5b9e\u73b0 \u90a3\u4e48\u5176\u4e2dpipe_order_complete\u51fd\u6570\u6a21\u5757\u5b9e\u73b0\u7684\u4e00\u4e2a\u601d\u8def，\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u6765\u7406\u89e3： \u5047\u8bbe\u57fa\u672c\u6307\u4ee4\u7684\u4e2a\u6570\u4e3an，\u90a3\u4e48\u7ba1\u9053\u7684\u4e2a\u6570\u5c31\u662fn-1,\u90a3\u4e48\u9996\u5148\u6211\u4eec\u4f1a\u5148\u8c03\u7528pipe\u63a5\u53e3\u5229\u7528for\u5faa\u73af\u6765\u521b\u5efan-1\u4e2a\u7ba1\u9053，\u6240\u4ee5\u8fd9\u91cc\u6211\u4f1a\u5b9a\u4e49\u4e00\u4e2apipe\u7c7b，\u90a3\u4e48pipe\u7c7b\u5c01\u88c5\u4e00\u4e2a\u957f\u5ea6\u4e3a2\u7684int\u7c7b\u578b\u7684\u6570\u7ec4，\u7136\u540e\u63a5\u7740\u6211\u4f1a\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3an-1\u7684vector\u6570\u7ec4,\u5176\u4e2d\u6bcf\u4e00\u4e2a\u5143\u7d20\u5c31\u662fpipe\u5bf9\u8c61，\u800c\u8c03\u7528pipe\u63a5\u53e3\u7684\u521b\u5efa\u7684\u6bcf\u4e00\u4e2a\u7ba1\u9053\u7684\u8bfb\u5199\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5c31\u4fdd\u5b58\u5728\u4e86\u5bf9\u5e94\u7684\u6570\u7ec4\u7684pipe\u5bf9\u8c61\u7684\u957f\u5ea6\u4e3a2\u7684int\u7c7b\u578b\u7684\u6570\u7ec4\u4e2d<\/p>\n

class<\/span> _pipe<\/span>
\n{<\/span>
\n public<\/span>:<\/span>
\n int<\/span> pipe_fd[<\/span>2<\/span>]<\/span>;<\/span>
\n}<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n int<\/span> n=<\/span>pipe<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd)<\/span>;<\/span>
\n if<\/span> (<\/span>n<<\/span>0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"pipe"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span> \/\/ \u9519\u8bef\u65f6\u76f4\u63a5\u9000\u51fa<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\u800c\u521b\u5efa\u5b8c\u4e86\u4e00\u6279\u7ba1\u9053\u6587\u4ef6，\u90a3\u4e48\u4e0b\u4e00\u6b65\u4fbf\u662f\u521b\u5efan\u4e2a\u8fdb\u7a0b，\u90a3\u4e48\u8fd8\u662f\u91c7\u53d6\u7684\u662f\u4e00\u4e2afor\u5faa\u73af\u7684\u903b\u8f91，\u7136\u540e\u5176\u4e2d\u8c03\u7528fork\u63a5\u53e3，\u90a3\u4e48\u5b50\u8fdb\u7a0b\u4f1a\u7ee7\u627f\u7236\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6，\u90a3\u4e48\u5176\u4e2d\u5bf9\u4e8e\u8d77\u59cb\u6307\u4ee4\u4ee5\u53ca\u7ed3\u5c3e\u6307\u4ee4\u8981\u8fdb\u884c\u7279\u6b8a\u7684\u5904\u7406，\u5bf9\u4e8e\u8d77\u59cb\u6307\u4ee4\u6765\u8bf4，\u90a3\u4e48\u5b83\u53ea\u80fd\u5411\u7ba1\u9053\u6587\u4ef6\u4e2d\u5199\u5165\u800c\u4e0d\u80fd\u8bfb\u53d6，\u56e0\u4e3a\u5b83\u5904\u4e8e\u8d77\u59cb\u4f4d\u7f6e，\u540c\u7406\u5bf9\u4e8e\u6700\u540e\u4e00\u4e2a\u57fa\u672c\u6765\u8bf4，\u90a3\u4e48\u5b83\u53ea\u80fd\u4ece\u7ba1\u9053\u6587\u4ef6\u4e2d\u8bfb\u53d6\u800c\u4e0d\u80fd\u5199\u5165<\/p>\n

\u800c\u5bf9\u4e8e\u4e2d\u95f4\u7684\u8fdb\u7a0b\u6765\u8bf4，\u90a3\u4e48\u6211\u4eec\u5c31\u5f97\u5c06\u5176\u7684\u6807\u51c6\u8f93\u5165\u7ed9\u91cd\u5b9a\u5411\u5230\u4e0a\u4e00\u4e2a\u7ba1\u9053\u6587\u4ef6\u7684\u8bfb\u7aef，\u800c\u5b83\u7684\u6807\u51c6\u8f93\u5165\u5219\u91cd\u5b9a\u5411\u5230\u5bf9\u5e94\u7ba1\u9053\u6587\u4ef6\u7684\u5199\u7aef<\/p>\n

\u5176\u6b21\u6ce8\u610f\u7684\u662f\u5982\u679c\u57fa\u672c\u6307\u4ee4\u542b\u6709\u8f93\u5165\u6216\u8005\u8f93\u51fa\u91cd\u5b9a\u5411，\u90a3\u4e48\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u7684\u4f18\u5148\u7ea7\u662f\u8981\u5927\u4e8e\u7ba1\u9053\u6587\u4ef6\u7684\u91cd\u5b9a\u5411，\u6bd4\u5982<\/p>\n

cmd1 >> log.<\/span>txt |<\/span> cmd2<\/p>\n

\u90a3\u4e48\u5bf9\u4e8ecmd1\u6765\u8bf4，\u5982\u679c\u5b83\u4f1a\u50cf\u663e\u793a\u5668\u4e5f\u5c31\u662f\u6807\u51c6\u8f93\u51fa\u6587\u4ef6\u4e2d\u5199\u5165\u7684\u8bdd，\u90a3\u4e48\u6b64\u65f6\u5b83\u4f1a\u5c06\u5199\u5165\u5230\u5185\u5bb9\u91cd\u5b9a\u5411\u5230log.txt\u4e2d\u800c\u4e0d\u662f\u7ba1\u9053\u6587\u4ef6\u4e2d，\u4e00\u5b9a\u8981\u6ce8\u610f\u8fd9\u4e2a\u7ec6\u8282，\u90a3\u4e48\u6700\u540e\u5bf9\u4e8e\u7236\u8fdb\u7a0b\u6765\u8bf4\u5219\u662f\u5173\u95ed\u5176\u4e4b\u524d\u521b\u5efa\u7684\u6240\u6709\u7684\u7ba1\u9053\u6587\u4ef6<\/p>\n

\u5176\u4e2d\u6ce8\u610f\u7684\u662f，\u5bf9\u4e8e\u5e26\u6709\u7ba1\u9053\u6587\u4ef6\u7684\u591a\u4e2a\u57fa\u672c\u6307\u4ee4\u7684\u6267\u884c，\u90a3\u4e48\u6211\u4eec\u4e0d\u9700\u8981\u5728\u53bb\u5224\u65ad\u6bcf\u4e00\u4e2a\u57fa\u672c\u6307\u4ee4\u662f\u5426\u4e3a\u5185\u7f6e\u6307\u4ee4，\u56e0\u4e3a\u5373\u4f7f\u662f\u5185\u7f6e\u6307\u4ee4，\u90a3\u4e48\u5b83\u4e5f\u53ea\u80fd\u5728\u5b50\u8fdb\u7a0b\u4e2d\u6267\u884c，\u56e0\u4e3a\u5982\u679c\u5185\u7f6e\u6307\u4ee4\u8fd8\u5728\u7236\u8fdb\u7a0b\u4e2d\u6267\u884c，\u90a3\u4e48\u6b64\u65f6\u7236\u8fdb\u7a0b\u4e5f\u5c31\u662fbash\u8fdb\u7a0b\u4f1a\u5411\u7ba1\u9053\u4e2d\u8bfb\u53d6\u4ee5\u53ca\u5199\u5165，\u90a3\u4e48\u8fd9\u4e9b\u7ba1\u9053\u80af\u5b9a\u90fd\u662f\u5b50\u8fdb\u7a0b\u4e4b\u95f4\u901a\u4fe1\u4f20\u9012\u4fe1\u606f，\u90a3\u4e48\u548c\u7236\u8fdb\u7a0b\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb，\u5e76\u4e14\u7ba1\u9053\u6587\u4ef6\u6d89\u53ca\u5230\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411\u4e5f\u5c31\u662f\u5173\u95ed\u6807\u51c6\u8f93\u5165\u4ee5\u53ca\u6807\u51c6\u8f93\u51fa\u6587\u4ef6，\u90a3\u4e48\u660e\u663e\u4f1a\u5f71\u54cd\u7236\u8fdb\u7a0b，\u56e0\u4e3a\u7236\u8fdb\u7a0b\u8fd8\u9700\u8981\u4ece\u6807\u51c6\u8f93\u5165\u6587\u4ef6\u4e2d\u8bfb\u53d6\u7528\u6237\u4e0b\u4e00\u6b21\u8f93\u5165\u7684\u6307\u4ee4\u4ee5\u53ca\u5c06\u6307\u4ee4\u7684\u6267\u884c\u7ed3\u679c\u6253\u5370\u5230\u7ec8\u7aef\u4e0a，\u6240\u4ee5\u4e0d\u7ba1\u662f\u5185\u7f6e\u8fd8\u662f\u5916\u90e8\u90fd\u7edf\u4e00\u4ea4\u7ed9\u5b50\u8fdb\u7a0b\u6765\u6267\u884c，\u6240\u4ee5\u4e00\u5b9a\u8981\u6ce8\u610f\u8fd9\u4e2a\u7ec6\u8282<\/p>\n

\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8efork\u521b\u5efa\u51fa\u7684\u6bcf\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u7684\u6267\u884c\u903b\u8f91\u548c\u4e4b\u524d\u6267\u884c\u5355\u4e2a\u57fa\u672c\u6307\u4ee4\u7684\u6267\u884c\u903b\u8f91\u662f\u4e00\u6837\u7684，\u5148\u5224\u65ad\u662f\u5426\u6709\u8f93\u5165\u4ee5\u53ca\u8f93\u51fa\u91cd\u5b9a\u5411，\u6ca1\u6709\u5c31\u91cd\u5b9a\u5411\u76f8\u5e94\u7684\u7ba1\u9053\u6587\u4ef6，\u7136\u540e\u518d\u8fdb\u884c\u8fdb\u7a0b\u7684\u66ff\u6362<\/p>\n

void<\/span> pipe_order_complete<\/span>(<\/span>int<\/span> cmdnum,<\/span> std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span> std::<\/span>vector<<\/span>_pipe><\/span>&<\/span> pipe_array)<\/span> {<\/span>
\n \/\/ 1. \u521b\u5efa\u6240\u6709\u7ba1\u9053<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n int<\/span> n=<\/span>pipe<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd)<\/span>;<\/span>
\n if<\/span> (<\/span>n<<\/span>0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"pipe"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span> \/\/ \u9519\u8bef\u65f6\u76f4\u63a5\u9000\u51fa<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 2. \u521b\u5efa\u5b50\u8fdb\u7a0b\u5904\u7406\u6bcf\u4e2a\u547d\u4ee4<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum;<\/span> i++<\/span>)<\/span> {<\/span>
\n int<\/span> pid =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>pid <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"fork"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span><\/p>\n

if<\/span> (<\/span>pid ==<\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u5b50\u8fdb\u7a0b<\/span>
\n \/\/ 2.1 \u5904\u7406\u8f93\u5165\u91cd\u5b9a\u5411\u6216\u524d\u4e00\u4e2a\u7ba1\u9053<\/span>
\n if<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 3<\/span>)<\/span> {<\/span> \/\/ \u8f93\u5165\u91cd\u5b9a\u5411 <<\/span>
\n int<\/span> fd_in =<\/span> open<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>filename,<\/span> O_RDONLY)<\/span>;<\/span>
\n if<\/span> (<\/span>fd_in <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n dup2<\/span>(<\/span>fd_in,<\/span> STDIN_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>fd_in)<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>i ><\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u4ece\u4e0a\u4e00\u4e2a\u7ba1\u9053\u8bfb\u53d6\u8f93\u5165<\/span>
\n dup2<\/span>(<\/span>pipe_array[<\/span>i–<\/span>1<\/span>]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>,<\/span> STDIN_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i–<\/span>1<\/span>]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 2.2 \u5904\u7406\u8f93\u51fa\u91cd\u5b9a\u5411\u6216\u4e0b\u4e00\u4e2a\u7ba1\u9053<\/span>
\n if<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 1<\/span> ||<\/span> order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 2<\/span>)<\/span> {<\/span>
\n \/\/ \u8f93\u51fa\u5230\u6587\u4ef6（\u4f18\u5148\u7ea7\u9ad8\u4e8e\u7ba1\u9053）<\/span>
\n int<\/span> flags =<\/span> O_WRONLY |<\/span> O_CREAT;<\/span>
\n flags |=<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 1<\/span>)<\/span> ?<\/span> O_TRUNC :<\/span> O_APPEND;<\/span>
\n int<\/span> fd_out =<\/span> open<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>filename,<\/span> flags,<\/span> 0666<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>fd_out <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n dup2<\/span>(<\/span>fd_out,<\/span> STDOUT_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>fd_out)<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>i <<\/span> cmdnum –<\/span> 1<\/span>)<\/span> {<\/span> \/\/ \u8f93\u51fa\u5230\u4e0b\u4e00\u4e2a\u7ba1\u9053<\/span>
\n dup2<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>,<\/span> STDOUT_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 2.3 \u5173\u95ed\u6240\u6709\u65e0\u5173\u7684\u7ba1\u9053\u7aef<\/span>
\n for<\/span> (<\/span>int<\/span> j =<\/span> 0<\/span>;<\/span> j <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
\n if<\/span> (<\/span>j !=<\/span> i &&<\/span> j !=<\/span> i–<\/span>1<\/span>)<\/span> {<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>j]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>j]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 2.4 \u6267\u884c\u547d\u4ee4<\/span>
\n execvp<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span> order_array[<\/span>i]<\/span>.<\/span>_argv)<\/span>;<\/span>
\n perror<\/span>(<\/span>"execvp"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 3. \u7236\u8fdb\u7a0b\u5173\u95ed\u6240\u6709\u7ba1\u9053\u7aef<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 4. \u7b49\u5f85\u6240\u6709\u5b50\u8fdb\u7a0b\u7ed3\u675f<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum;<\/span> i++<\/span>)<\/span> {<\/span>
\n wait<\/span>(<\/span>NULL<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

(3).\u5b8c\u6574\u5b9e\u73b0<\/h3>\n

myshell.h<\/p>\n

#<\/span>include<\/span><iostream><\/span><\/span>
\n#<\/span>include<\/span><cstdio><\/span><\/span>
\n#<\/span>include<\/span><cstdio><\/span><\/span>
\n#<\/span>include<\/span><sys\/wait.h><\/span><\/span>
\n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
\n#<\/span>include<\/span><unistd.h><\/span><\/span>
\n#<\/span>include<\/span><vector><\/span><\/span>
\n#<\/span>include<\/span><cstring><\/span><\/span>
\n#<\/span>include<\/span><fcntl.h><\/span><\/span>
\n#<\/span>include<\/span><cstdlib><\/span><\/span>
\n#<\/span>include<\/span><cstdbool><\/span><\/span>
\n#<\/span>define<\/span> MAX_SIZE<\/span> 1024<\/span><\/span><\/span>
\nconst<\/span> char<\/span>*<\/span> in_cmd[<\/span>]<\/span>=<\/span>{<\/span>"cd"<\/span>,<\/span>"pwd"<\/span>,<\/span>NULL<\/span>}<\/span>;<\/span>
\nclass<\/span> order<\/span>
\n{<\/span>
\n public<\/span>:<\/span>
\n char<\/span>*<\/span> _argv[<\/span>MAX_SIZE]<\/span>;<\/span>
\n int<\/span> _argc=<\/span>0<\/span>;<\/span>
\n int<\/span> _check_redir=<\/span>0<\/span>;<\/span>
\n char<\/span>*<\/span> filename=<\/span>nullptr<\/span>;<\/span>
\n}<\/span>;<\/span>
\nclass<\/span> _pipe<\/span>
\n{<\/span>
\n public<\/span>:<\/span>
\n int<\/span> pipe_fd[<\/span>2<\/span>]<\/span>;<\/span>
\n}<\/span>;<\/span>
\nvoid<\/span> get_string<\/span>(<\/span>order&<\/span> a,<\/span>char<\/span>*<\/span> temp_order)<\/span>;<\/span>
\nint<\/span> pipe_string<\/span>(<\/span>std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span>char<\/span> temp[<\/span>]<\/span>)<\/span>;<\/span>
\nbool<\/span> check_order<\/span>(<\/span>order&<\/span> a)<\/span>;<\/span>
\nvoid<\/span> in_order_complete<\/span>(<\/span>order&<\/span> a)<\/span>;<\/span>
\nvoid<\/span> pipe_order_complete<\/span>(<\/span>int<\/span> cmdnum,<\/span>std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span>std::<\/span>vector<<\/span>_pipe><\/span>&<\/span> pipe_array)<\/span>;<\/span><\/p>\n

myshell.hpp<\/p>\n

```cpp
\n#<\/span>include<\/span>"myshell.h"<\/span><\/span>
\nvoid<\/span> get_string<\/span>(<\/span>order&<\/span> a,<\/span>char<\/span>*<\/span> temp_order)<\/span>
\n{<\/span>
\nint<\/span> len=<\/span>strlen<\/span>(<\/span>temp_order)<\/span>;<\/span>
\nif<\/span>(<\/span>len><\/span>0<\/span>&&<\/span>temp_order[<\/span>len–<\/span>1<\/span>]<\/span>==<\/span>'\\\\n'<\/span>)<\/span>
\n{<\/span>
\ntemp_order[<\/span>len–<\/span>1<\/span>]<\/span>=<\/span>'\\\\0'<\/span>;<\/span>
\n}<\/span>
\nchar<\/span>*<\/span> token=<\/span>strtok<\/span>(<\/span>temp_order,<\/span>" "<\/span>)<\/span>;<\/span>
\nint<\/span> argc=<\/span>0<\/span>;<\/span>
\nwhile<\/span>(<\/span>token!=<\/span>NULL<\/span>&&<\/span>argc<<\/span>MAX_SIZE)<\/span>
\n{<\/span>
\na.<\/span>_argv[<\/span>argc++<\/span>]<\/span>=<\/span>token;<\/span>
\ntoken=<\/span>strtok<\/span>(<\/span>NULL<\/span>,<\/span>" "<\/span>)<\/span>;<\/span>
\n}<\/span>
\na.<\/span>_argv[<\/span>argc]<\/span>=<\/span>NULL<\/span>;<\/span>
\na.<\/span>_argc=<\/span>0<\/span>;<\/span>
\nfor<\/span>(<\/span>int<\/span> i=<\/span>argc–<\/span>2<\/span>;<\/span>i>=<\/span>0<\/span>;<\/span>i—<\/span>)<\/span>
\n{<\/span>
\nif<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>">"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n{<\/span>
\na.<\/span>_check_redir=<\/span>1<\/span>;<\/span>
\nif<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\na.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\na.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\na.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n}<\/span>
\nbreak<\/span>;<\/span>
\n}<\/span>else<\/span> if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>">>"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n a.<\/span>_check_redir=<\/span>2<\/span>;<\/span>
\n if<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\n a.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n }<\/span>
\n break<\/span>;<\/span>
\n }<\/span>else<\/span> if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>i]<\/span>,<\/span>"<"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n a.<\/span>_check_redir=<\/span>3<\/span>;<\/span>
\n if<\/span>(<\/span>i+<\/span>1<\/span><<\/span>argc)<\/span>{<\/span>
\n a.<\/span>filename=<\/span>a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i]<\/span>=<\/span>NULL<\/span>;<\/span>
\n a.<\/span>_argv[<\/span>i+<\/span>1<\/span>]<\/span>=<\/span>NULL<\/span>;<\/span>
\n }<\/span>
\n break<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n while<\/span>(<\/span>a.<\/span>_argv[<\/span>a.<\/span>_argc]<\/span>!=<\/span>NULL<\/span>&&<\/span>a.<\/span>argc<<\/span>MAX_SIZE)<\/span>
\n {<\/span>
\n a.<\/span>_argc++<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n int<\/span> pipe_string<\/span>(<\/span>std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span>char<\/span> temp[<\/span>]<\/span>)<\/span>
\n {<\/span>
\n int<\/span> cmdnum=<\/span>0<\/span>;<\/span>
\n char<\/span>*<\/span> tmp[<\/span>MAX_SIZE]<\/span>;<\/span>
\n char<\/span>*<\/span> token=<\/span>strtok<\/span>(<\/span>temp,<\/span>"|"<\/span>)<\/span>;<\/span>
\n while<\/span>(<\/span>token!=<\/span>NULL<\/span>&&<\/span>cmdnum<<\/span>MAX_SIZE)<\/span>
\n {<\/span>
\n tmp[<\/span>cmdnum]<\/span>=<\/span>token;<\/span>
\n cmdnum++<\/span>;<\/span>
\n token=<\/span>strtok<\/span>(<\/span>NULL<\/span>,<\/span>"|"<\/span>)<\/span>;<\/span>
\n }<\/span>
\n for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>;<\/span>i<<\/span>cmdnum;<\/span>i++<\/span>)<\/span>
\n {<\/span>
\n get_string<\/span>(<\/span>order_array[<\/span>i]<\/span>,<\/span>tmp[<\/span>i]<\/span>)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> cmdnum;<\/span>
\n }<\/span>
\n bool<\/span> check_order<\/span>(<\/span>order&<\/span> a)<\/span>
\n {<\/span>
\n for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>;<\/span>in_cmd[<\/span>i]<\/span>!=<\/span>NULL<\/span>;<\/span>i++<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>in_cmd[<\/span>i]<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n return<\/span> true<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n return<\/span> false<\/span>;<\/span>
\n }<\/span>
\n void<\/span> in_order_complete<\/span>(<\/span>order&<\/span> a)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>"cd"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_argc==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>chdir<\/span>(<\/span>a.<\/span>_argv[<\/span>1<\/span>]<\/span>)<\/span>!=<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"chdir"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>else<\/span>
\n {<\/span>
\n std::<\/span>cout<<<\/span>"the order is not right"<\/span><<<\/span>std::<\/span>endl;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n if<\/span>(<\/span>strcmp<\/span>(<\/span>a.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>"pwd"<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n char<\/span> cwd[<\/span>1024<\/span>]<\/span>;<\/span>
\n if<\/span>(<\/span>getcwd<\/span>(<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>!=<\/span>NULL<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>1<\/span>||<\/span>a.<\/span>_check_redir==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>1<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>a.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>write<\/span>(<\/span>_fd,<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"write"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span>else<\/span> if<\/span>(<\/span>a.<\/span>_check_redir==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>a.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY|<\/span>O_APPEND,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>write<\/span>(<\/span>_fd,<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"write"<\/span>)<\/span>;<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

}<\/span>else<\/span>
\n {<\/span>
\n std::<\/span>cout<<<\/span>cwd<<<\/span>std::<\/span>endl;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span>
\n void<\/span> pipe_order_complete<\/span>(<\/span>int<\/span> cmdnum,<\/span> std::<\/span>vector<<\/span>order><\/span>&<\/span> order_array,<\/span> std::<\/span>vector<<\/span>_pipe><\/span>&<\/span> pipe_array)<\/span> {<\/span>
\n \/\/ 1. \u521b\u5efa\u6240\u6709\u7ba1\u9053<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n int<\/span> n=<\/span>pipe<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd)<\/span>;<\/span>
\n if<\/span> (<\/span>n<<\/span>0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"pipe"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span> \/\/ \u9519\u8bef\u65f6\u76f4\u63a5\u9000\u51fa<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 2. \u521b\u5efa\u5b50\u8fdb\u7a0b\u5904\u7406\u6bcf\u4e2a\u547d\u4ee4<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum;<\/span> i++<\/span>)<\/span> {<\/span>
\n int<\/span> pid =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>pid <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"fork"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span><\/p>\n

if<\/span> (<\/span>pid ==<\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u5b50\u8fdb\u7a0b<\/span>
\n \/\/ 2.1 \u5904\u7406\u8f93\u5165\u91cd\u5b9a\u5411\u6216\u524d\u4e00\u4e2a\u7ba1\u9053<\/span>
\n if<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 3<\/span>)<\/span> {<\/span> \/\/ \u8f93\u5165\u91cd\u5b9a\u5411 <<\/span>
\n int<\/span> fd_in =<\/span> open<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>filename,<\/span> O_RDONLY)<\/span>;<\/span>
\n if<\/span> (<\/span>fd_in <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n dup2<\/span>(<\/span>fd_in,<\/span> STDIN_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>fd_in)<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>i ><\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u4ece\u4e0a\u4e00\u4e2a\u7ba1\u9053\u8bfb\u53d6\u8f93\u5165<\/span>
\n dup2<\/span>(<\/span>pipe_array[<\/span>i–<\/span>1<\/span>]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>,<\/span> STDIN_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i–<\/span>1<\/span>]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 2.2 \u5904\u7406\u8f93\u51fa\u91cd\u5b9a\u5411\u6216\u4e0b\u4e00\u4e2a\u7ba1\u9053<\/span>
\n if<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 1<\/span> ||<\/span> order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 2<\/span>)<\/span> {<\/span>
\n \/\/ \u8f93\u51fa\u5230\u6587\u4ef6（\u4f18\u5148\u7ea7\u9ad8\u4e8e\u7ba1\u9053）<\/span>
\n int<\/span> flags =<\/span> O_WRONLY |<\/span> O_CREAT;<\/span>
\n flags |=<\/span> (<\/span>order_array[<\/span>i]<\/span>.<\/span>_check_redir ==<\/span> 1<\/span>)<\/span> ?<\/span> O_TRUNC :<\/span> O_APPEND;<\/span>
\n int<\/span> fd_out =<\/span> open<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>filename,<\/span> flags,<\/span> 0666<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>fd_out <<\/span> 0<\/span>)<\/span> {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n dup2<\/span>(<\/span>fd_out,<\/span> STDOUT_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>fd_out)<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>i <<\/span> cmdnum –<\/span> 1<\/span>)<\/span> {<\/span> \/\/ \u8f93\u51fa\u5230\u4e0b\u4e00\u4e2a\u7ba1\u9053<\/span>
\n dup2<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>,<\/span> STDOUT_FILENO)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 2.3 \u5173\u95ed\u6240\u6709\u65e0\u5173\u7684\u7ba1\u9053\u7aef<\/span>
\n for<\/span> (<\/span>int<\/span> j =<\/span> 0<\/span>;<\/span> j <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
\n if<\/span> (<\/span>j !=<\/span> i &&<\/span> j !=<\/span> i–<\/span>1<\/span>)<\/span> {<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>j]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>j]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 2.4 \u6267\u884c\u547d\u4ee4<\/span>
\n execvp<\/span>(<\/span>order_array[<\/span>i]<\/span>.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span> order_array[<\/span>i]<\/span>.<\/span>_argv)<\/span>;<\/span>
\n perror<\/span>(<\/span>"execvp"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ 3. \u7236\u8fdb\u7a0b\u5173\u95ed\u6240\u6709\u7ba1\u9053\u7aef<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum –<\/span> 1<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n close<\/span>(<\/span>pipe_array[<\/span>i]<\/span>.<\/span>pipe_fd[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/ 4. \u7b49\u5f85\u6240\u6709\u5b50\u8fdb\u7a0b\u7ed3\u675f<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> cmdnum;<\/span> i++<\/span>)<\/span> {<\/span>
\n wait<\/span>(<\/span>NULL<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n` <\/p>\n

myshell.cpp<\/p>\n

#<\/span>include<\/span>"myshell.hpp"<\/span><\/span>
\nint<\/span> main<\/span>(<\/span>)<\/span>
\n{<\/span>
\nwhile<\/span>(<\/span>true<\/span>)<\/span>
\n{<\/span>
\n char<\/span> cwd[<\/span>1024<\/span>]<\/span>;<\/span>
\n getcwd<\/span>(<\/span>cwd,<\/span>sizeof<\/span>(<\/span>cwd)<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"[%s@%s %s]$"<\/span>,<\/span>getenv<\/span>(<\/span>"USER"<\/span>)<\/span>,<\/span>getenv<\/span>(<\/span>"HOSTNAME"<\/span>)<\/span>,<\/span>cwd)<\/span>;<\/span>
\nchar<\/span> temp[<\/span>MAX_SIZE]<\/span>;<\/span>
\nif<\/span>(<\/span>fgets<\/span>(<\/span>temp,<\/span>sizeof<\/span>(<\/span>temp)<\/span>,<\/span>stdin<\/span>)<\/span>==<\/span>NULL<\/span>)<\/span>
\n{<\/span>
\nperror<\/span>(<\/span>"fgets"<\/span>)<\/span>;<\/span>
\ncontinue<\/span>;<\/span>
\n}<\/span>
\nint<\/span> cmdnum=<\/span>0<\/span>;<\/span>
\nstd::<\/span>vector<<\/span>order><\/span> order_array<\/span>(<\/span>MAX_SIZE)<\/span>;<\/span>
\ncmdnum=<\/span>pipe_string<\/span>(<\/span>order_array,<\/span>temp)<\/span>;<\/span>
\nif<\/span>(<\/span>cmdnum==<\/span>0<\/span>)<\/span>
\n{<\/span>
\ncontinue<\/span>;<\/span>
\n}<\/span>
\nelse<\/span> if<\/span>(<\/span>cmdnum==<\/span>1<\/span>)<\/span>
\n{<\/span>
\nif<\/span>(<\/span>check_order<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>)<\/span>)<\/span>
\n {<\/span>
\n in_order_complete<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
\n }<\/span>else<\/span>
\n {<\/span>
\n int<\/span> id=<\/span>fork<\/span>(<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>id<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"fork"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n if<\/span>(<\/span>id==<\/span>0<\/span>)<\/span>
\n {<\/span>
\n if<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>_check_redir==<\/span>1<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY|<\/span>O_TRUNC,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>dup2<\/span>(<\/span>_fd,<\/span>1<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"dup2"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n if<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>_check_redir==<\/span>2<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>filename,<\/span>O_CREAT|<\/span>O_WRONLY|<\/span>O_APPEND,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>dup2<\/span>(<\/span>_fd,<\/span>1<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"dup2"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n if<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>_check_redir==<\/span>3<\/span>)<\/span>
\n {<\/span>
\n int<\/span> _fd=<\/span>open<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>filename,<\/span>O_CREAT|<\/span>O_RDONLY,<\/span>0666<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>_fd<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"open"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n int<\/span> n=<\/span>dup2<\/span>(<\/span>_fd,<\/span>0<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"dup2"<\/span>)<\/span>;<\/span>
\n continue<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n execvp<\/span>(<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>_argv[<\/span>0<\/span>]<\/span>,<\/span>order_array[<\/span>0<\/span>]<\/span>.<\/span>_argv)<\/span>;<\/span>
\n perror<\/span>(<\/span>"execvp"<\/span>)<\/span>;<\/span>
\n exit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
\n }<\/span>
\n int<\/span> statues;<\/span>
\n int<\/span> n=<\/span>waitpid<\/span>(<\/span>id,<\/span>&<\/span>statues,<\/span>0<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span>n<<\/span>0<\/span>)<\/span>
\n {<\/span>
\n perror<\/span>(<\/span>"waitpid"<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>else<\/span>{<\/span><\/p>\n

std::<\/span>vector<<\/span>_pipe><\/span> pipe_array<\/span>(<\/span>cmdnum–<\/span>1<\/span>)<\/span>;<\/span>
\n pipe_order_complete<\/span>(<\/span>cmdnum,<\/span>order_array,<\/span>pipe_array)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

4.\u7ed3\u8bed<\/h2>\n

\u90a3\u4e48\u8fd9\u5c31\u662f\u672c\u671f\u5173\u4e8e\u5b8c\u5584shell\u5916\u58f3\u7a0b\u5e8f\u7684\u5168\u90e8\u8fc7\u7a0b\u4e86，\u90a3\u4e48\u5e0c\u671b\u8bfb\u8005\u4e5f\u53ef\u4ee5\u81ea\u5df1\u53bb\u5b9e\u73b0\u4e00\u4e0b，\u53ef\u4ee5\u52a0\u6df1\u4f60\u5bf9\u533f\u540d\u7ba1\u9053\u7684\u7406\u89e3，\u90a3\u4e48\u6211\u4e0b\u4e00\u671f\u4f1a\u7ee7\u7eed\u66f4\u65b0\u533f\u540d\u7ba1\u9053\u7684\u76f8\u5173\u5185\u5bb9，\u5e76\u4e14\u6765\u52a8\u624b\u5b9e\u73b0\u4e00\u4e2a\u7b80\u6613\u7684\u8fdb\u7a0b\u6c60，\u90a3\u4e48\u6211\u4f1a\u6301\u7eed\u66f4\u65b0，\u5e0c\u671b\u4f60\u591a\u591a\u5173\u6ce8，\u5982\u679c\u672c\u6587\u6709\u5e2e\u7ec4\u5230\u4f60\u7684\u8bdd，\u8fd8\u8bf7\u591a\u591a\u4e09\u8fde\u52a0\u5173\u6ce8\u54e6，\u4f60\u7684\u652f\u6301\u5c31\u662f\u6211\u6700\u5927\u7684\u52a8\u529b！<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

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