{"id":38083,"date":"2025-05-19T14:13:59","date_gmt":"2025-05-19T06:13:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/38083.html"},"modified":"2025-05-19T14:13:59","modified_gmt":"2025-05-19T06:13:59","slug":"%e3%80%90linux%e3%80%91%e7%ae%80%e6%98%93%e7%89%88shell%e5%ae%9e%e7%8e%b0%ef%bc%88%e9%99%84%e6%ba%90%e7%a0%81%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/38083.html","title":{"rendered":"\u3010Linux\u3011\u7b80\u6613\u7248Shell\u5b9e\u73b0\uff08\u9644\u6e90\u7801\uff09"},"content":{"rendered":"

\"\"<\/p>\n

🌟🌟\u4f5c\u8005\u4e3b\u9875：ephemerals__<\/p>\n

🌟🌟\u6240\u5c5e\u4e13\u680f：Linux<\/p>\n

\u524d\u8a00<\/h2>\n

\u4e4b\u524d\u6211\u4eec\u5b66\u4e60\u4e86Linux\u7684\u8fdb\u7a0b\u6982\u5ff5\u4ee5\u53ca\u8fdb\u7a0b\u63a7\u5236\u76f8\u5173\u63a5\u53e3：<\/p>\n

\u3010Linux\u3011\u8fdb\u7a0b\u63a7\u5236-CSDN\u535a\u5ba2<\/p>\n

\u672c\u7bc7\u6587\u7ae0，\u6211\u4eec\u5c06\u4e00\u8d77\u8e0f\u4e0a\u4e00\u6bb5\u6709\u8da3\u7684\u65c5\u7a0b，\u57fa\u4e8e\u4e4b\u524d\u5b66\u4e60\u7684\u8fdb\u7a0b\u76f8\u5173\u6982\u5ff5\u4ee5\u53ca\u63a7\u5236\u63a5\u53e3，\u4eff\u7167CentOS \u2013 Bash\u7684\u5de5\u4f5c\u6d41\u7a0b，\u5b9e\u73b0\u4e00\u4e2a\u529f\u80fd\u867d\u7136\u7b80\u5355，\u4f46\u8db3\u4ee5\u8ba9\u4f60\u6df1\u523b\u7406\u89e3 Shell \u5de5\u4f5c\u539f\u7406\u7684\u8ff7\u4f60 Shell\u3002<\/p>\n

\u6b63\u6587\u5f00\u59cb<\/p>\n

\u4e00\u3001\u7a0b\u5e8f\u6d41\u7a0b\u5206\u6790<\/h2>\n

\u6211\u4eec\u65e5\u5e38\u4f7f\u7528Bash\u65f6，\u901a\u8fc7\u8f93\u5165\u547d\u4ee4\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c，\u6bd4\u5982：<\/p>\n

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

\u90a3\u4e48，Bash\u662f\u5982\u4f55\u8fdb\u884c\u5de5\u4f5c\u7684\u5462？\u89c2\u5bdf\u4e00\u4e0b，\u5c31\u4f1a\u53d1\u73b0，\u9996\u5148Bash\u4f1a\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26，\u5305\u62ec\u5f53\u524d\u7528\u6237\u3001\u4e3b\u673a\u540d\u4ee5\u53ca\u8def\u5f84\u3002\u4e4b\u540e\u4f1a\u7b49\u5f85\u6211\u4eec\u8f93\u5165\u76f8\u5173\u547d\u4ee4，\u7136\u540e\u6839\u636e\u547d\u4ee4\u6267\u884c\u76f8\u5e94\u7a0b\u5e8f\u3002\u7a0b\u5e8f\u6267\u884c\u7ed3\u675f\u540e，\u5c31\u4f1a\u518d\u6b21\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26，\u7b49\u5f85\u6211\u4eec\u518d\u6b21\u8f93\u5165\u6307\u4ee4\u2026\u5f88\u660e\u663e\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\u3002<\/p>\n

\u603b\u7ed3\u4e00\u4e0b，Bash\u7684\u5927\u4f53\u5de5\u4f5c\u6d41\u7a0b\u662f：<\/p>\n

  • \u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26（\u5305\u62ec\u5f53\u524d\u7528\u6237\u540d\u3001\u4e3b\u673a\u540d\u3001\u8def\u5f84）<\/li>\n
  • \u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/li>\n
  • \u89e3\u6790\u547d\u4ee4\u884c<\/li>\n
  • \u6267\u884c\u547d\u4ee4<\/li>\n
  • \u7ee7\u7eed\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u2026<\/li>\n

    \u6ce8\u610f：\u5f53Bash\u6267\u884c\u975e\u5185\u5efa\u547d\u4ee4\u65f6，\u4f1a\u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b，\u7531\u5b50\u8fdb\u7a0b\u5b8c\u6210\u76f8\u5e94\u7684\u5de5\u4f5c，Bash\u81ea\u5df1\u7b49\u5f85\u5b50\u8fdb\u7a0b\u5de5\u4f5c\u7ed3\u675f\u3002\u800c\u5bf9\u4e8e\u5185\u5efa\u547d\u4ee4（\u5982cd，echo），\u9700\u8981Bash\u81ea\u5df1\u6267\u884c\u4efb\u52a1\u3002<\/p>\n

    \"![[Pasted<\/p>\n

    \u4e8c\u3001\u4ee3\u7801\u5b9e\u73b0<\/h2>\n

    \u63a5\u4e0b\u6765，\u6211\u4eec\u5f00\u59cb\u6309\u7167\u4e0a\u8ff0\u5de5\u4f5c\u6d41\u7a0b，\u4e00\u6b65\u6b65\u5b9e\u73b0\u6211\u4eec\u7684\u7b80\u6613Shell\u3002<\/p>\n

    1. \u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/h3>\n

    CentOS\u7684\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u4e3b\u8981\u5305\u542b\u4e09\u4e2a\u5185\u5bb9：\u5f53\u524d\u7528\u6237\u540d\u3001\u4e3b\u673a\u540d\u548c\u5f53\u524d\u6240\u5728\u8def\u5f84\u3002 \u4e4b\u524d\u5b66\u4e60Linux\u73af\u5883\u53d8\u91cf\u65f6，\u6211\u4eec\u4e86\u89e3\u5230\u73af\u5883\u53d8\u91cf（USER\u3001HOSTNAME\u3001PWD）\u4e2d\u5b58\u50a8\u7740\u8fd9\u4e9b\u5185\u5bb9\u3002\u6240\u4ee5\u6211\u4eec\u4f7f\u7528getenv\u51fd\u6570\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u76f8\u5e94\u7684\u503c\u3002<\/p>\n

    \u4ee3\u7801\u5b9e\u73b0：<\/p>\n

    #<\/span>include<\/span> <iostream><\/span><\/span>
    \n#<\/span>include<\/span> <cstdio><\/span><\/span>
    \n#<\/span>include<\/span> <cstring><\/span><\/span>
    \n#<\/span>include<\/span> <cstdlib><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/types.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/wait.h><\/span><\/span><\/p>\n

    \/\/\u83b7\u53d6\u5f53\u524d\u7528\u6237\u540d<\/span>
    \nconst<\/span> char<\/span>*<\/span> GetUserName<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n const<\/span> char<\/span>*<\/span> name =<\/span> getenv<\/span>(<\/span>"USER"<\/span>)<\/span>;<\/span>
    \n return<\/span> name ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> name;<\/span>
    \n}<\/span><\/p>\n

    \/\/\u83b7\u53d6\u5f53\u524d\u4e3b\u673a\u540d<\/span>
    \nconst<\/span> char<\/span>*<\/span> GetHostName<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n const<\/span> char<\/span>*<\/span> name =<\/span> getenv<\/span>(<\/span>"HOSTNAME"<\/span>)<\/span>;<\/span>
    \n return<\/span> name ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> name;<\/span>
    \n}<\/span><\/p>\n

    \/\/\u83b7\u53d6\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
    \nconst<\/span> char<\/span>*<\/span> GetPwd<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n const<\/span> char<\/span>*<\/span> pwd =<\/span> getenv<\/span>(<\/span>"PWD"<\/span>)<\/span>;<\/span>
    \n return<\/span> pwd ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> pwd;<\/span>
    \n}<\/span><\/p>\n

    \u63a5\u4e0b\u6765，\u8c03\u7528\u8fd9\u4e9b\u51fd\u6570，\u5f62\u6210\u4e00\u4e32\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u5e76\u6253\u5370：<\/p>\n

    \/\/\u521b\u5efa\u5e76\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
    \nvoid<\/span> PrintCommandPrompt<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n char<\/span> CommandPrompt[<\/span>1024<\/span>]<\/span>;<\/span>
    \n \/\/\u8fd9\u91cc\u4e3a\u4e86\u533a\u5206Bash，\u7528\u5927\u62ec\u53f7<\/span>
    \n snprintf<\/span>(<\/span>CommandPrompt,<\/span> sizeof<\/span> CommandPrompt,<\/span>"{%s@%s %s}@ "<\/span> ,<\/span> GetUserName<\/span>(<\/span>)<\/span>,<\/span> GetHostName<\/span>(<\/span>)<\/span>,<\/span> GetPwd<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n std::<\/span>cout <<<\/span> CommandPrompt <<<\/span> std::<\/span>flush;<\/span> \/\/ \u6253\u5370\u5e76\u5237\u65b0\u7f13\u51b2\u533a<\/span>
    \n}<\/span><\/p>\n

    \u6ce8\u610f\u8fd9\u91cc\u6253\u5370\u7ed3\u675f\u540e，\u7531\u4e8e\u6ca1\u6709\u6362\u884c，\u6240\u4ee5\u7f13\u51b2\u533a\u53ef\u80fd\u4e0d\u4f1a\u5237\u65b0，\u5bfc\u81f4\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u6ca1\u6709\u51fa\u73b0\u5728\u5c4f\u5e55\u4e0a\u3002\u56e0\u6b64\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u4e3b\u52a8\u5237\u65b0\u7f13\u51b2\u533a\u3002<\/p>\n

    \u8fdb\u884c\u6d4b\u8bd5：<\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/p>\n

    \"obsidian:\/\/open?vault=%E5%8D%9A%E5%AE%A2&file=Pasted%20image%2020250518155420.png\"<\/p>\n

    \u53ef\u4ee5\u770b\u5230，\u7528\u6237\u540d\u548c\u4e3b\u673a\u540d\u90fd\u6b63\u5e38\u6253\u5370，\u4f46\u5728\u6211\u4eec\u5199\u7684shell\u4e2d，\u5f53\u524d\u6240\u5728\u8def\u5f84\u662f\u7edd\u5bf9\u8def\u5f84，\u592a\u8fc7\u5197\u957f，\u6240\u4ee5\u53ef\u4ee5\u5bf9\u751f\u6210\u7684\u8def\u5f84\u8fdb\u884c\u4e00\u4e9b\u5904\u7406：<\/p>\n

    \/\/\u521b\u5efa\u5e76\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
    \nvoid<\/span> PrintCommandPrompt<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n char<\/span> CommandPrompt[<\/span>1024<\/span>]<\/span>;<\/span><\/p>\n

    \/\/\u5904\u7406\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
    \n std::<\/span>string pwd =<\/span> GetPwd<\/span>(<\/span>)<\/span>;<\/span>
    \n if<\/span>(<\/span>pwd !=<\/span> "\/"<\/span>)<\/span> \/\/ \u5982\u679c\u662f\u6839\u76ee\u5f55，\u5219\u76f4\u63a5\u8f93\u51fa<\/span>
    \n pwd =<\/span> pwd.<\/span>substr<\/span>(<\/span>pwd.<\/span>rfind<\/span>(<\/span>'\/'<\/span>)<\/span> +<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u67e5\u627e\u6700\u540e\u4e00\u4e2a"\/"，\u5e76\u4ece\u4e0b\u4e00\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u5206\u5272<\/span><\/p>\n

    \/\/\u8fd9\u91cc\u4e3a\u4e86\u533a\u5206Bash，\u7528\u5927\u62ec\u53f7<\/span>
    \n snprintf<\/span>(<\/span>CommandPrompt,<\/span> sizeof<\/span> CommandPrompt,<\/span>"{%s@%s %s}@ "<\/span> ,<\/span> GetUserName<\/span>(<\/span>)<\/span>,<\/span> GetHostName<\/span>(<\/span>)<\/span>,<\/span> pwd.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n \/\/std::cout << CommandPrompt << std::flush; \/\/ \u6253\u5370\u5e76\u5237\u65b0\u7f13\u51b2\u533a<\/span>
    \n std::<\/span>cout <<<\/span> "{ep@VM-20-13-centos code035}@ "<\/span> <<<\/span> std::<\/span>flush;<\/span>
    \n}<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/p>\n

    \"![[Pasted<\/p>\n

    2. \u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/h3>\n

    \u5728Bash\u8f93\u5165\u547d\u4ee4\u65f6，\u5f80\u5f80\u4f1a\u5e26\u4e0a\u4e00\u4e9b\u9009\u9879，\u5e76\u7528\u7a7a\u683c\u9694\u5f00\u3002\u56e0\u6b64，\u4f7f\u7528scanf\u6216cin\u8bfb\u5165\u65f6\u4f1a\u4ee5\u7a7a\u683c\u4f5c\u4e3a\u5206\u9694\u7b26，\u8fbe\u4e0d\u5230\u60f3\u8981\u7684\u6548\u679c\u3002\u8fd9\u91cc\u6211\u4eec\u9009\u62e9\u7528fgets\u8fdb\u884c\u8bfb\u53d6\u3002<\/p>\n

    \u53e6\u5916，\u4e3b\u51fd\u6570\u5f53\u4e2d，\u547d\u4ee4\u7684\u5168\u90e8\u5904\u7406\u5e94\u8be5\u653e\u5728\u4e00\u4e2a\u6b7b\u5faa\u73af\u5f53\u4e2d，\u8fd9\u6837\u624d\u80fd\u5b8c\u6210\u7528\u6237\u591a\u6b21\u6d3e\u53d1\u7684\u4efb\u52a1\u3002<\/p>\n

    \/\/\u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
    \nbool<\/span> GetCommandLine<\/span>(<\/span>char<\/span>*<\/span> command,<\/span> int<\/span> size)<\/span>
    \n{<\/span>
    \n \/\/\u4ece\u952e\u76d8\u8bfb\u53d6\u547d\u4ee4<\/span>
    \n if<\/span>(<\/span>fgets<\/span>(<\/span>command,<\/span> size,<\/span> stdin<\/span>)<\/span> ==<\/span> nullptr<\/span>)<\/span>
    \n {<\/span>
    \n return<\/span> false<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/\u6ce8\u610f\u6e05\u7406\u672b\u5c3e\u7684'\\\\n'<\/span>
    \n if<\/span>(<\/span>strlen<\/span>(<\/span>command)<\/span> ==<\/span> 0<\/span>)<\/span> return<\/span> false<\/span>;<\/span>
    \n command[<\/span>strlen<\/span>(<\/span>command)<\/span> –<\/span> 1<\/span>]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
    \n return<\/span> true<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n while<\/span>(<\/span>true<\/span>)<\/span>
    \n {<\/span>
    \n \/\/\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
    \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \/\/\u8bfb\u5165\u547d\u4ee4<\/span>
    \n char<\/span> command[<\/span>1024<\/span>]<\/span>;<\/span>
    \n if<\/span>(<\/span>!<\/span>GetCommandLine<\/span>(<\/span>command,<\/span> sizeof<\/span> command)<\/span>)<\/span> \/\/ \u82e5\u8bfb\u53d6\u9519\u8bef，\u5c31continue\u91cd\u65b0\u8bfb\u53d6<\/span>
    \n {<\/span>
    \n std::<\/span>cout <<<\/span> "\u8bfb\u53d6\u9519\u8bef"<\/span> <<<\/span> std::<\/span>endl;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/\u6253\u5370\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
    \n std::<\/span>cout <<<\/span> command <<<\/span> std::<\/span>endl;<\/span>
    \n }<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u6ce8\u610f：\u4f7f\u7528fgets\u4ece\u952e\u76d8\u8bfb\u53d6\u5b57\u7b26\u4e32\u65f6\u4f1a\u9644\u5e26\u672b\u5c3e\u2019\\\\n\u2019，\u9700\u8981\u8fdb\u884c\u5904\u7406\u3002<\/p>\n

    \u8fd0\u884c\u6d4b\u8bd5：<\/p>\n

    \"![[Pasted<\/p>\n

    \u53ef\u4ee5\u770b\u5230，\u7a0b\u5e8f\u6210\u529f\u8bfb\u5165\u4e86\u6211\u4eec\u7684\u547d\u4ee4（\u5305\u62ec\u7a7a\u683c），\u5e76\u4e14\u5c06\u547d\u4ee4\u56de\u663e\u51fa\u6765\u3002<\/p>\n

    3. \u547d\u4ee4\u884c\u89e3\u6790<\/h3>\n

    \u547d\u4ee4\u884c\u89e3\u6790\u7684\u8fc7\u7a0b\u4e2d，\u9700\u8981\u5c06\u7528\u6237\u8bfb\u5165\u7684\u547d\u4ee4\u884c\u8fdb\u884c\u5206\u5272，\u63d0\u53d6\u51fa\u8981\u6267\u884c\u7684\u7a0b\u5e8f\u540d\u4ee5\u53ca\u9009\u9879\u3002\u8fd9\u91cc\u6211\u4eec\u521b\u5efa\u4e24\u4e2a\u5168\u5c40\u53d8\u91cfg_argc\u548cg_argv，\u5206\u522b\u5b58\u50a8\u89e3\u6790\u5230\u7684\u547d\u4ee4\u884c\u53c2\u6570\u4ee5\u53ca\u53c2\u6570\u4e2a\u6570，\u65b9\u4fbf\u540e\u7eed\u6307\u4ee4\u7684\u6267\u884c\u3002<\/p>\n

    \u6ce8：\u8fd9\u91cc\u7684\u547d\u4ee4\u884c\u5206\u5272\u64cd\u4f5c\u7531strtok\u51fd\u6570\u5b8c\u6210\u3002\u5982\u679c\u4f60\u4e0d\u662f\u5f88\u4e86\u89e3strtok\u51fd\u6570，\u53ef\u4ee5\u53c2\u9605\u8fd9\u7bc7\u6587\u7ae0：<\/p>\n

    \u3010c\u8bed\u8a00\u3011\u5b57\u7b26\u4e32\u51fd\u6570\u548c\u5185\u5b58\u51fd\u6570-CSDN\u535a\u5ba2<\/p>\n

    \u4ee3\u7801\u5b9e\u73b0：<\/p>\n

    \/\/\u5168\u5c40\u53d8\u91cf\u5b58\u50a8\u547d\u4ee4\u884c\u53c2\u6570\u53ca\u5176\u4e2a\u6570<\/span>
    \nint<\/span> g_argc =<\/span> 0<\/span>;<\/span>
    \nchar<\/span>*<\/span> g_argv[<\/span>128<\/span>]<\/span>;<\/span><\/p>\n

    \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
    \nbool<\/span> CommandParse<\/span>(<\/span>char<\/span>*<\/span> command)<\/span>
    \n{<\/span>
    \n g_argc =<\/span> 0<\/span>;<\/span>
    \n for<\/span>(<\/span>char<\/span>*<\/span> p =<\/span> strtok<\/span>(<\/span>command,<\/span> " "<\/span>)<\/span>;<\/span> p !=<\/span> nullptr<\/span>;<\/span> p =<\/span> strtok<\/span>(<\/span>nullptr<\/span>,<\/span> " "<\/span>)<\/span>)<\/span>
    \n {<\/span>
    \n g_argv[<\/span>g_argc++<\/span>]<\/span> =<\/span> p;<\/span>
    \n }<\/span>
    \n return<\/span> g_argc ==<\/span> 0<\/span> ?<\/span> false<\/span> :<\/span> true<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span>
    \n{<\/span>
    \n while<\/span>(<\/span>true<\/span>)<\/span>
    \n {<\/span>
    \n \/\/\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
    \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \/\/\u8bfb\u5165\u547d\u4ee4<\/span>
    \n char<\/span> command[<\/span>1024<\/span>]<\/span>;<\/span>
    \n if<\/span>(<\/span>!<\/span>GetCommandLine<\/span>(<\/span>command,<\/span> sizeof<\/span> command)<\/span>)<\/span> \/\/ \u82e5\u8bfb\u53d6\u9519\u8bef，\u5c31continue\u91cd\u65b0\u8bfb\u53d6<\/span>
    \n {<\/span>
    \n std::<\/span>cout <<<\/span> "\u8f93\u5165\u9519\u8bef"<\/span> <<<\/span> std::<\/span>endl;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span>
    \n \/\/ \/\/\u6253\u5370\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
    \n \/\/ std::cout << command << std::endl;<\/span><\/p>\n

    \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
    \n if<\/span>(<\/span>!<\/span>CommandParse<\/span>(<\/span>command)<\/span>)<\/span>
    \n {<\/span>
    \n std::<\/span>cout <<<\/span> "\u547d\u4ee4\u884c\u89e3\u6790\u5931\u8d25"<\/span> <<<\/span> std::<\/span>endl;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span>
    \n \/\/\u6253\u5370\u89e3\u6790\u7ed3\u679c<\/span>
    \n for<\/span>(<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> g_argc;<\/span> i++<\/span>)<\/span>
    \n {<\/span>
    \n std::<\/span>cout <<<\/span> g_argv[<\/span>i]<\/span> <<<\/span> std::<\/span>endl;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u6d4b\u8bd5\u7ed3\u679c：<\/p>\n

    \"![[Pasted<\/p>\n

    \u7a0b\u5e8f\u6210\u529f\u5730\u6309\u7167\u7a7a\u683c\u5c06\u6211\u4eec\u8f93\u5165\u7684\u547d\u4ee4\u884c\u53c2\u6570\u63d0\u53d6\u4e86\u51fa\u6765\u3002\u63a5\u4e0b\u6765，\u6839\u636e\u63d0\u53d6\u5230\u7684\u53c2\u6570，\u5c31\u53ef\u4ee5\u6267\u884c\u76f8\u5173\u6307\u4ee4\u4e86\u3002<\/p>\n

    4. \u6267\u884c\u547d\u4ee4<\/h3>\n

    \u5bf9\u4e8e\u975e\u5185\u5efa\u547d\u4ee4，Bash\u4f1a\u521b\u5efa\u5b50\u8fdb\u7a0b，\u5e76\u8ba9\u5b50\u8fdb\u7a0b\u6267\u884c；\u800c\u5bf9\u4e8e\u5185\u5efa\u547d\u4ee4，\u5219\u662f\u7531Bash\u81ea\u5df1\u6267\u884c\u3002\u56e0\u6b64，\u6267\u884c\u547d\u4ee4\u4e4b\u524d，\u9700\u8981\u5148\u5224\u65ad\u8be5\u547d\u4ee4\u662f\u5426\u662f\u5185\u5efa\u547d\u4ee4，\u7136\u540e\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n

    \u4e3a\u4ec0\u4e48\u4f1a\u6709\u5185\u5efa\u547d\u4ee4？<\/p>\n

      \n
    • \u6548\u7387： \u6267\u884c\u5185\u5efa\u547d\u4ee4\u901a\u5e38\u6bd4\u6267\u884c\u5916\u90e8\u547d\u4ee4\u66f4\u5feb，\u56e0\u4e3a\u907f\u514d\u4e86\u521b\u5efa\u65b0\u8fdb\u7a0b\u7684\u5f00\u9500\u3002<\/li>\n
    • Shell \u529f\u80fd： \u8bb8\u591a\u5185\u5efa\u547d\u4ee4\u76f4\u63a5\u64cd\u4f5c Shell \u7684\u5185\u90e8\u72b6\u6001，\u4f8b\u5982\u6539\u53d8\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55 (cd)\u3001\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf (export)\u3001\u63a7\u5236 Shell \u884c\u4e3a\u7b49，\u8fd9\u4e9b\u529f\u80fd\u5982\u679c\u4f5c\u4e3a\u5916\u90e8\u547d\u4ee4\u5b9e\u73b0\u4f1a\u66f4\u52a0\u590d\u6742\u6216\u4e0d\u53ef\u80fd\u3002<\/li>\n
    • \u57fa\u672c\u64cd\u4f5c： \u4e00\u4e9b\u975e\u5e38\u57fa\u7840\u548c\u5e38\u7528\u7684\u64cd\u4f5c\u9700\u8981\u4f5c\u4e3a\u5185\u5efa\u547d\u4ee4\u63d0\u4f9b，\u4ee5\u786e\u4fdd Shell \u7684\u57fa\u672c\u529f\u80fd\u53ef\u7528<\/li>\n<\/ul>\n

      \u5185\u5efa\u547d\u4ee4\u7684\u5904\u7406<\/h4>\n

      \u5728Bash\u5f53\u4e2d，\u53ef\u4ee5\u4f7f\u7528type\u547d\u4ee4\u5224\u65ad\u4e00\u4e2a\u547d\u4ee4\u662f\u5426\u662f\u5185\u5efa\u547d\u4ee4，\u4f8b\u5982：<\/p>\n

      \"![[Pasted<\/p>\n

      \u5f53\u7136，\u9664\u4e86cd\u548cecho\u547d\u4ee4，\u8fd8\u6709printf\u3001help\u7b49\u5185\u5efa\u547d\u4ee4\u3002\u672c\u6b21\u5b9e\u73b0\u4e2d，\u4e3a\u4e86\u80fd\u591f\u8ba9\u5927\u5bb6\u6df1\u523b\u7406\u89e3shell\u8fd0\u884c\u539f\u7406，\u540c\u65f6\u964d\u4f4e\u5b9e\u73b0\u96be\u5ea6，\u535a\u4e3b\u5c31\u53ea\u9488\u5bf9cd\u548cecho\u8fd9\u4e24\u4e2a\u5185\u5efa\u547d\u4ee4\u8fdb\u884c\u7b80\u6613\u5b9e\u73b0\u3002<\/p>\n

      \u5185\u5efa\u547d\u4ee4\u7684\u68c0\u67e5\u548c\u5904\u7406：<\/p>\n

      \/\/\u5185\u5efa\u547d\u4ee4\u5904\u7406<\/span>
      \nbool<\/span> CheckAndExecBuiltin<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n \/\/\u53d6\u51fa\u547d\u4ee4\u884c\u53c2\u6570\u8868\u7684\u9996\u5143\u7d20，\u5224\u65ad\u662f\u5426\u4e3a\u5185\u5efa\u547d\u4ee4，\u5982\u679c\u662f，\u5219\u76f4\u63a5\u6267\u884c<\/span>
      \n std::<\/span>string str =<\/span> g_argv[<\/span>0<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>str ==<\/span> "cd"<\/span>)<\/span>
      \n {<\/span>
      \n Cd<\/span>(<\/span>)<\/span>;<\/span>
      \n return<\/span> true<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>str ==<\/span> "echo"<\/span>)<\/span>
      \n {<\/span>
      \n Echo<\/span>(<\/span>)<\/span>;<\/span>
      \n return<\/span> true<\/span>;<\/span>
      \n }<\/span>
      \n \/\/else if(…)<\/span>
      \n return<\/span> false<\/span>;<\/span> \/\/ \u4e0d\u662f\u5185\u5efa\u547d\u4ee4，\u76f4\u63a5\u8fd4\u56de<\/span>
      \n}<\/span><\/p>\n

      int<\/span> main<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n while<\/span>(<\/span>true<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
      \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u8bfb\u5165\u547d\u4ee4<\/span>
      \n char<\/span> command[<\/span>1024<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>!<\/span>GetCommandLine<\/span>(<\/span>command,<\/span> sizeof<\/span> command)<\/span>)<\/span> \/\/ \u82e5\u8bfb\u53d6\u9519\u8bef，\u5c31continue\u91cd\u65b0\u8bfb\u53d6<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u8f93\u5165\u9519\u8bef"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
      \n \/\/ std::cout << command << std::endl;<\/span><\/p>\n

      \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
      \n if<\/span>(<\/span>!<\/span>CommandParse<\/span>(<\/span>command)<\/span>)<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u547d\u4ee4\u884c\u89e3\u6790\u5931\u8d25"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u89e3\u6790\u7ed3\u679c<\/span>
      \n \/\/ for(int i = 0; i < g_argc; i++)<\/span>
      \n \/\/ {<\/span>
      \n \/\/ std::cout << g_argv[i] << std::endl;<\/span>
      \n \/\/ }<\/span><\/p>\n

      \/\/\u5185\u5efa\u547d\u4ee4\u7684\u5904\u7406<\/span>
      \n if<\/span>(<\/span>CheckAndExecBuiltin<\/span>(<\/span>)<\/span>)<\/span>
      \n {<\/span>
      \n continue<\/span>;<\/span> \/\/ \u662f\u5185\u5efa\u547d\u4ee4，\u6267\u884c\u5b8c\u6bd5\u5c31\u56de\u53bb\u91cd\u65b0\u6253\u5370\u63d0\u793a\u7b26<\/span>
      \n }<\/span><\/p>\n

      \/\/\u4e0d\u662f\u5185\u5efa\u547d\u4ee4，\u7531\u5b50\u8fdb\u7a0b\u5904\u7406<\/span>
      \n }<\/span>
      \n return<\/span> 0<\/span>;<\/span>
      \n}<\/span><\/p>\n

      cd\u7684\u7b80\u6613\u5b9e\u73b0<\/h5>\n

      cd\u7684\u529f\u80fd\u662f\u6539\u53d8\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u3002\u5982\u679c\u521b\u5efa\u5b50\u8fdb\u7a0b，\u5176\u53ea\u80fd\u4fee\u6539\u5b83\u81ea\u5df1\u7684\u5de5\u4f5c\u8def\u5f84，\u800c\u65e0\u6cd5\u4fee\u6539Bash\u7684\u5de5\u4f5c\u8def\u5f84\u3002\u56e0\u6b64cd\u64cd\u4f5c\u9700\u8981Bash\u4eb2\u81ea\u5b8c\u6210\u3002 \u6211\u4eec\u83b7\u53d6\u5230\u547d\u4ee4\u884c\u53c2\u6570\u540e，\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528chdir\u51fd\u6570\u5b9e\u73b0：<\/p>\n

      void<\/span> Cd<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n std::<\/span>string dst;<\/span>
      \n if<\/span>(<\/span>g_argc ==<\/span> 1<\/span> ||<\/span> g_argv[<\/span>1<\/span>]<\/span> ==<\/span> std::<\/span>string<\/span>(<\/span>"~"<\/span>)<\/span>)<\/span> \/\/ \u5904\u7406\u8fdb\u5165\u5bb6\u76ee\u5f55\u7684\u60c5\u51b5<\/span>
      \n {<\/span>
      \n dst =<\/span> GetHome<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>dst ==<\/span> ""<\/span>)<\/span> return<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span>
      \n {<\/span>
      \n dst =<\/span> g_argv[<\/span>1<\/span>]<\/span>;<\/span>
      \n }<\/span>
      \n chdir<\/span>(<\/span>dst.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u6d4b\u8bd5\u7ed3\u679c：<\/p>\n

      \"![[Pasted<\/p>\n

      \u53ef\u4ee5\u770b\u5230，\u4f7f\u7528cd\u540e，\u5f53\u524d\u8def\u5f84\u8c8c\u4f3c\u5e76\u6ca1\u6709\u53d1\u751f\u6539\u53d8\u3002\u4e3a\u4ec0\u4e48\u5462？\u5b9e\u9645\u4e0achdir\u786e\u5b9e\u8d77\u5230\u4e86\u6548\u679c，\u4f46\u662f\u6211\u4eec\u7684\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u4e2d，\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u662f\u4ece\u73af\u5883\u53d8\u91cf\u4e2d\u83b7\u53d6\u7684，\u73af\u5883\u53d8\u91cf\u4e2d\u7684PWD\u5e76\u6ca1\u6709\u53d1\u751f\u6539\u53d8\u3002 \u56e0\u6b64，\u4fee\u6539\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u4e4b\u540e，\u8981\u987a\u5e26\u7740\u4fee\u6539\u73af\u5883\u53d8\u91cfPWD\u7684\u503c\u3002\u5176\u6b21，\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u6539\u53d8\u540e，\u4fee\u6539\u73af\u5883\u53d8\u91cf\u4e4b\u524d，\u8981\u83b7\u53d6\u5230\u5f53\u524d\u5de5\u4f5c\u8def\u5f84，\u5c31\u9700\u8981\u4f7f\u7528getcwd\u51fd\u6570\u3002\u8fdb\u884c\u952e\u503c\u5904\u7406\u540e，\u4f7f\u7528putenv\u4fee\u6539\u73af\u5883\u53d8\u91cf\u3002<\/p>\n

      \u53e6\u5916\u8981\u6ce8\u610f：\u8bb8\u591aputenv\u51fd\u6570\u7684\u5b9e\u73b0（\u7279\u522b\u662f POSIX \u6807\u51c6\u7684\u5b9e\u73b0）\u4e0d\u4f1a\u590d\u5236\u6211\u4eec\u4f20\u9012\u7ed9\u5b83\u7684\u5b57\u7b26\u4e32，\u800c\u4f1a\u76f4\u63a5\u4f7f\u7528\u4f20\u5165\u7684\u6307\u9488\u6765\u8868\u793a\u65b0\u7684\u73af\u5883\u53d8\u91cf，\u56e0\u6b64\u8981\u521b\u5efa\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u5b58\u50a8PWD\u952e\u503c\u5bf9，\u786e\u4fdd\u5176\u4e0d\u4f1a\u88ab\u9500\u6bc1\u3002<\/p>\n

      \"![[Pasted<\/p>\n

      \u4ee3\u7801\u5b9e\u73b0：<\/p>\n

      \/\/\u5168\u5c40\u7684\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \nchar<\/span> cwd[<\/span>256<\/span>]<\/span>;<\/span><\/p>\n

      void<\/span> Cd<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n std::<\/span>string dst;<\/span>
      \n if<\/span>(<\/span>g_argc ==<\/span> 1<\/span> ||<\/span> g_argv[<\/span>1<\/span>]<\/span> ==<\/span> "~"<\/span>)<\/span> \/\/ \u5904\u7406\u8fdb\u5165\u5bb6\u76ee\u5f55\u7684\u60c5\u51b5<\/span>
      \n {<\/span>
      \n dst =<\/span> GetHome<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>dst ==<\/span> ""<\/span>)<\/span> return<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span>
      \n {<\/span>
      \n dst =<\/span> g_argv[<\/span>1<\/span>]<\/span>;<\/span>
      \n }<\/span>
      \n chdir<\/span>(<\/span>dst.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u540c\u65f6\u4fee\u6539\u73af\u5883\u53d8\u91cf\u4e2d\u7684\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \n char<\/span> tmp[<\/span>128<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>getcwd<\/span>(<\/span>tmp,<\/span> sizeof<\/span> tmp)<\/span>)<\/span>
      \n {<\/span>
      \n snprintf<\/span>(<\/span>cwd,<\/span> sizeof<\/span> cwd,<\/span> "PWD=%s"<\/span>,<\/span> tmp)<\/span>;<\/span> \/\/ \u952e\u503c\u5904\u7406<\/span>
      \n putenv<\/span>(<\/span>cwd)<\/span>;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \u6d4b\u8bd5\u7ed3\u679c：<\/p>\n

      \"![[Pasted<\/p>\n

      echo\u7684\u7b80\u6613\u5b9e\u73b0<\/h5>\n

      echo\u4e0d\u4ec5\u53ef\u4ee5\u5411\u5c4f\u5e55\u6253\u5370\u5b57\u7b26\u4e32，\u8fd8\u53ef\u4ee5\u6253\u5370\u4e0a\u4e00\u4e2a\u6267\u884c\u7684\u7a0b\u5e8f\u7684\u9000\u51fa\u7801\u3001\u4ee5\u53ca\u73af\u5883\u53d8\u91cf\u7b49\u4fe1\u606f\u3002\u4e3a\u4e86\u786e\u4fdd\u6548\u7387\u4ee5\u53ca\u6267\u884c\u7684\u53ef\u9760\u6027，\u8be5\u547d\u4ee4\u4e5f\u662f\u4e00\u4e2a\u5185\u5efa\u547d\u4ee4，\u7531Bash\u4eb2\u81ea\u6267\u884c\u3002<\/p>\n

      \/\/\u5168\u5c40\u53d8\u91cf\u8bb0\u5f55\u4e0a\u4e00\u4e2a\u7a0b\u5e8f\u7684\u9000\u51fa\u7801<\/span>
      \nint<\/span> exit_code;<\/span><\/p>\n

      void<\/span> Echo<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n std::<\/span>string op =<\/span> g_argv[<\/span>1<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>op ==<\/span> "$?"<\/span>)<\/span> \/\/ \u6253\u5370\u4e0a\u4e00\u4e2a\u7a0b\u5e8f\u7684\u9000\u51fa\u7801<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> exit_code <<<\/span> std::<\/span>endl;<\/span>
      \n exit_code =<\/span> 0<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>op[<\/span>0<\/span>]<\/span> ==<\/span> '$'<\/span>)<\/span> \/\/ \u6253\u5370\u73af\u5883\u53d8\u91cf\u7684\u503c<\/span>
      \n {<\/span>
      \n \/\/\u4ece"$"\u540e\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb，\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u540d<\/span>
      \n std::<\/span>string name =<\/span> op.<\/span>substr<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u7528getenv\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u503c<\/span>
      \n const<\/span> char<\/span>*<\/span> value =<\/span> getenv<\/span>(<\/span>name.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>value)<\/span>
      \n std::<\/span>cout <<<\/span> value <<<\/span> std::<\/span>endl;<\/span>
      \n }<\/span>
      \n else<\/span> \/\/ \u6253\u5370\u5b57\u7b26\u4e32<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> op <<<\/span> std::<\/span>endl;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \u6d4b\u8bd5\u7ed3\u679c：<\/p>\n

      \"![[Pasted<\/p>\n

      \u975e\u5185\u5efa\u547d\u4ee4\u7684\u5904\u7406<\/h4>\n

      \u9488\u5bf9\u975e\u5185\u5efa\u547d\u4ee4，\u9700\u8981\u521b\u5efa\u5b50\u8fdb\u7a0b，\u7136\u540e\u7531\u5b50\u8fdb\u7a0b\u627e\u5230\u7cfb\u7edf\u7684\u5bf9\u5e94\u6307\u4ee4\u7a0b\u5e8f\u7684\u4f4d\u7f6e，\u76f4\u63a5\u8fdb\u884c\u8fdb\u7a0b\u7a0b\u5e8f\u66ff\u6362，\u5b8c\u6210\u76f8\u5173\u4efb\u52a1\u3002\u8fd9\u6837\u6211\u4eec\u5c31\u65e0\u9700\u4e00\u4e2a\u4e2a\u5b9e\u73b0\u76f8\u5173\u6307\u4ee4\u64cd\u4f5c\u4e86\u3002<\/p>\n

      \u4e3a\u4e86\u8ba9\u5b50\u8fdb\u7a0b\u81ea\u52a8\u67e5\u627e\u5bf9\u5e94\u7a0b\u5e8f\u7684\u4f4d\u7f6e，\u51cf\u5c11\u6211\u4eec\u7684\u5de5\u4f5c\u91cf，\u4e14\u4f7f\u7a0b\u5e8f\u66ff\u6362\u7684\u53c2\u6570\u4e0e\u6211\u4eec\u521b\u5efa\u7684\u5168\u5c40\u547d\u4ee4\u884c\u53c2\u6570\u8868\u4e00\u4e00\u5bf9\u5e94，\u8fd9\u91cc\u6211\u4eec\u76f4\u63a5\u9009\u7528execvp\u8fdb\u884c\u7a0b\u5e8f\u66ff\u6362\u3002<\/p>\n

      #<\/span>include<\/span> <unistd.h><\/span><\/span><\/p>\n

      int<\/span> execvp<\/span>(<\/span>const<\/span> char<\/span> *<\/span>file,<\/span> char<\/span> *<\/span>const<\/span> argv[<\/span>]<\/span>)<\/span><\/p>\n

      \u4ee3\u7801\u5b9e\u73b0：<\/p>\n

      \/\/\u6267\u884c\u975e\u5185\u5efa\u547d\u4ee4<\/span>
      \nvoid<\/span> Execute<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b<\/span>
      \n pid_t id =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>id <<\/span> 0<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b\u5931\u8d25，\u76f4\u63a5\u9000\u51fa<\/span>
      \n exit<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>id ==<\/span> 0<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u5b50\u8fdb\u7a0b — \u901a\u8fc7\u7a0b\u5e8f\u66ff\u6362\u6267\u884c\u6307\u4ee4<\/span>
      \n execvp<\/span>(<\/span>g_argv[<\/span>0<\/span>]<\/span>,<\/span> g_argv)<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span>
      \n {<\/span>
      \n \/\/\u7236\u8fdb\u7a0b — \u7b49\u5f85\u5b50\u8fdb\u7a0b，\u5e76\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f<\/span>
      \n int<\/span> status =<\/span> 0<\/span>;<\/span>
      \n pid_t rid =<\/span> waitpid<\/span>(<\/span>id,<\/span> &<\/span>status,<\/span> 0<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>rid ><\/span> 0<\/span>)<\/span> \/\/ \u7b49\u5f85\u6210\u529f<\/span>
      \n {<\/span>
      \n \/\/\u5c06\u9000\u51fa\u4fe1\u606f\u5b58\u5165\u5168\u5c40exit_code<\/span>
      \n exit_code =<\/span> WEXITSTATUS<\/span>(<\/span>status)<\/span>;<\/span>
      \n }<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      int<\/span> main<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n while<\/span>(<\/span>true<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
      \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u8bfb\u5165\u547d\u4ee4<\/span>
      \n char<\/span> command[<\/span>1024<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>!<\/span>GetCommandLine<\/span>(<\/span>command,<\/span> sizeof<\/span> command)<\/span>)<\/span> \/\/ \u82e5\u8bfb\u53d6\u9519\u8bef，\u5c31continue\u91cd\u65b0\u8bfb\u53d6<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u8f93\u5165\u9519\u8bef"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
      \n \/\/ std::cout << command << std::endl;<\/span><\/p>\n

      \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
      \n if<\/span>(<\/span>!<\/span>CommandParse<\/span>(<\/span>command)<\/span>)<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u547d\u4ee4\u884c\u89e3\u6790\u5931\u8d25"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u89e3\u6790\u7ed3\u679c<\/span>
      \n \/\/ for(int i = 0; i < g_argc; i++)<\/span>
      \n \/\/ {<\/span>
      \n \/\/ std::cout << g_argv[i] << std::endl;<\/span>
      \n \/\/ }<\/span><\/p>\n

      \/\/\u5185\u5efa\u547d\u4ee4\u7684\u5904\u7406<\/span>
      \n if<\/span>(<\/span>CheckAndExecBuiltin<\/span>(<\/span>)<\/span>)<\/span>
      \n {<\/span>
      \n continue<\/span>;<\/span> \/\/ \u662f\u5185\u5efa\u547d\u4ee4，\u6267\u884c\u5b8c\u6bd5\u5c31\u56de\u53bb\u91cd\u65b0\u6253\u5370\u63d0\u793a\u7b26<\/span>
      \n }<\/span><\/p>\n

      \/\/\u4e0d\u662f\u5185\u5efa\u547d\u4ee4，\u7531\u5b50\u8fdb\u7a0b\u5904\u7406<\/span>
      \n Execute<\/span>(<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n return<\/span> 0<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u4e09\u3001\u6d4b\u8bd5<\/h2>\n

      \u63a5\u4e0b\u6765，\u6211\u4eec\u8f93\u5165\u4e00\u4e9b\u6307\u4ee4\u8fdb\u884c\u6d4b\u8bd5，\u770b\u770b\u6211\u4eec\u5b9e\u73b0\u7684shell\u80fd\u5426\u8fbe\u5230\u9884\u671f\u6548\u679c： \"![[Pasted perfect！<\/p>\n

      \u56db\u3001\u7a0b\u5e8f\u5168\u90e8\u4ee3\u7801<\/h2>\n

      \u81ea\u5b9e\u73b0shell\u7684\u5168\u90e8\u4ee3\u7801\u5982\u4e0b：<\/p>\n

      #<\/span>include<\/span> <iostream><\/span><\/span>
      \n#<\/span>include<\/span> <cstdio><\/span><\/span>
      \n#<\/span>include<\/span> <cstdlib><\/span><\/span>
      \n#<\/span>include<\/span> <cstring><\/span><\/span>
      \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
      \n#<\/span>include<\/span> <sys\/types.h><\/span><\/span>
      \n#<\/span>include<\/span> <sys\/wait.h><\/span><\/span><\/p>\n

      \/\/\u5168\u5c40\u53d8\u91cf\u5b58\u50a8\u547d\u4ee4\u884c\u53c2\u6570\u53ca\u5176\u4e2a\u6570<\/span>
      \nint<\/span> g_argc =<\/span> 0<\/span>;<\/span>
      \nchar<\/span>*<\/span> g_argv[<\/span>128<\/span>]<\/span>;<\/span><\/p>\n

      \/\/\u5168\u5c40\u7684\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \nchar<\/span> cwd[<\/span>256<\/span>]<\/span>;<\/span><\/p>\n

      \/\/\u5168\u5c40\u53d8\u91cf\u8bb0\u5f55\u4e0a\u4e00\u4e2a\u7a0b\u5e8f\u7684\u9000\u51fa\u7801<\/span>
      \nint<\/span> exit_code;<\/span><\/p>\n

      \/\/\u83b7\u53d6\u5f53\u524d\u7528\u6237\u540d<\/span>
      \nconst<\/span> char<\/span>*<\/span> GetUserName<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n const<\/span> char<\/span>*<\/span> name =<\/span> getenv<\/span>(<\/span>"USER"<\/span>)<\/span>;<\/span>
      \n return<\/span> name ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> name;<\/span>
      \n}<\/span><\/p>\n

      \/\/\u83b7\u53d6\u5f53\u524d\u4e3b\u673a\u540d<\/span>
      \nconst<\/span> char<\/span>*<\/span> GetHostName<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n const<\/span> char<\/span>*<\/span> name =<\/span> getenv<\/span>(<\/span>"HOSTNAME"<\/span>)<\/span>;<\/span>
      \n return<\/span> name ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> name;<\/span>
      \n}<\/span><\/p>\n

      \/\/\u83b7\u53d6\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \nconst<\/span> char<\/span>*<\/span> GetPwd<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n const<\/span> char<\/span>*<\/span> pwd =<\/span> getenv<\/span>(<\/span>"PWD"<\/span>)<\/span>;<\/span>
      \n return<\/span> pwd ==<\/span> nullptr<\/span> ?<\/span> "none"<\/span> :<\/span> pwd;<\/span>
      \n}<\/span><\/p>\n

      \/\/\u83b7\u53d6\u7528\u6237\u7684\u5bb6\u76ee\u5f55<\/span>
      \nconst<\/span> char<\/span>*<\/span> GetHome<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n const<\/span> char<\/span>*<\/span> home =<\/span> getenv<\/span>(<\/span>"HOME"<\/span>)<\/span>;<\/span>
      \n return<\/span> home ==<\/span> nullptr<\/span> ?<\/span> ""<\/span> :<\/span> home;<\/span>
      \n}<\/span><\/p>\n

      \/\/\u521b\u5efa\u5e76\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
      \nvoid<\/span> PrintCommandPrompt<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n char<\/span> CommandPrompt[<\/span>1024<\/span>]<\/span>;<\/span><\/p>\n

      \/\/\u5904\u7406\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \n std::<\/span>string pwd =<\/span> GetPwd<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>pwd !=<\/span> "\/"<\/span>)<\/span> \/\/ \u5982\u679c\u662f\u6839\u76ee\u5f55，\u5219\u76f4\u63a5\u8f93\u51fa<\/span>
      \n pwd =<\/span> pwd.<\/span>substr<\/span>(<\/span>pwd.<\/span>rfind<\/span>(<\/span>'\/'<\/span>)<\/span> +<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u67e5\u627e\u6700\u540e\u4e00\u4e2a"\/"，\u5e76\u4ece\u4e0b\u4e00\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u5206\u5272<\/span><\/p>\n

      \/\/\u8fd9\u91cc\u4e3a\u4e86\u533a\u5206Bash，\u7528\u5927\u62ec\u53f7<\/span>
      \n snprintf<\/span>(<\/span>CommandPrompt,<\/span> sizeof<\/span> CommandPrompt,<\/span>"{%s@%s %s}@ "<\/span> ,<\/span> GetUserName<\/span>(<\/span>)<\/span>,<\/span> GetHostName<\/span>(<\/span>)<\/span>,<\/span> pwd.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \n std::<\/span>cout <<<\/span> CommandPrompt <<<\/span> std::<\/span>flush;<\/span> \/\/ \u6253\u5370\u5e76\u5237\u65b0\u7f13\u51b2\u533a<\/span>
      \n}<\/span><\/p>\n

      \/\/\u83b7\u53d6\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
      \nbool<\/span> GetCommandLine<\/span>(<\/span>char<\/span>*<\/span> command,<\/span> int<\/span> size)<\/span>
      \n{<\/span>
      \n \/\/\u4ece\u952e\u76d8\u8bfb\u53d6\u547d\u4ee4<\/span>
      \n if<\/span>(<\/span>fgets<\/span>(<\/span>command,<\/span> size,<\/span> stdin<\/span>)<\/span> ==<\/span> nullptr<\/span>)<\/span>
      \n {<\/span>
      \n return<\/span> false<\/span>;<\/span>
      \n }<\/span><\/p>\n

      \/\/\u6ce8\u610f\u6e05\u7406\u672b\u5c3e\u7684'\\\\n'<\/span>
      \n if<\/span>(<\/span>strlen<\/span>(<\/span>command)<\/span> ==<\/span> 0<\/span>)<\/span> return<\/span> false<\/span>;<\/span>
      \n command[<\/span>strlen<\/span>(<\/span>command)<\/span> –<\/span> 1<\/span>]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
      \n return<\/span> true<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
      \nbool<\/span> CommandParse<\/span>(<\/span>char<\/span>*<\/span> command)<\/span>
      \n{<\/span>
      \n g_argc =<\/span> 0<\/span>;<\/span>
      \n for<\/span>(<\/span>char<\/span>*<\/span> p =<\/span> strtok<\/span>(<\/span>command,<\/span> " "<\/span>)<\/span>;<\/span> p !=<\/span> nullptr<\/span>;<\/span> p =<\/span> strtok<\/span>(<\/span>nullptr<\/span>,<\/span> " "<\/span>)<\/span>)<\/span>
      \n {<\/span>
      \n g_argv[<\/span>g_argc++<\/span>]<\/span> =<\/span> p;<\/span>
      \n }<\/span>
      \n return<\/span> g_argc ==<\/span> 0<\/span> ?<\/span> false<\/span> :<\/span> true<\/span>;<\/span>
      \n}<\/span><\/p>\n

      void<\/span> Cd<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n std::<\/span>string dst;<\/span>
      \n if<\/span>(<\/span>g_argc ==<\/span> 1<\/span> ||<\/span> g_argv[<\/span>1<\/span>]<\/span> ==<\/span> std::<\/span>string<\/span>(<\/span>"~"<\/span>)<\/span>)<\/span> \/\/ \u5904\u7406\u8fdb\u5165\u5bb6\u76ee\u5f55\u7684\u60c5\u51b5<\/span>
      \n {<\/span>
      \n dst =<\/span> GetHome<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>dst ==<\/span> ""<\/span>)<\/span> return<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span>
      \n {<\/span>
      \n dst =<\/span> g_argv[<\/span>1<\/span>]<\/span>;<\/span>
      \n }<\/span>
      \n chdir<\/span>(<\/span>dst.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u540c\u65f6\u4fee\u6539\u73af\u5883\u53d8\u91cf\u4e2d\u7684\u5f53\u524d\u5de5\u4f5c\u8def\u5f84<\/span>
      \n char<\/span> tmp[<\/span>128<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>getcwd<\/span>(<\/span>tmp,<\/span> sizeof<\/span> tmp)<\/span>)<\/span>
      \n {<\/span>
      \n snprintf<\/span>(<\/span>cwd,<\/span> sizeof<\/span> cwd,<\/span> "PWD=%s"<\/span>,<\/span> tmp)<\/span>;<\/span>
      \n putenv<\/span>(<\/span>cwd)<\/span>;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      void<\/span> Echo<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n std::<\/span>string op =<\/span> g_argv[<\/span>1<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>op ==<\/span> "$?"<\/span>)<\/span> \/\/ \u6253\u5370\u4e0a\u4e00\u4e2a\u7a0b\u5e8f\u7684\u9000\u51fa\u7801<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> exit_code <<<\/span> std::<\/span>endl;<\/span>
      \n exit_code =<\/span> 0<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>op[<\/span>0<\/span>]<\/span> ==<\/span> '$'<\/span>)<\/span> \/\/ \u6253\u5370\u73af\u5883\u53d8\u91cf\u7684\u503c<\/span>
      \n {<\/span>
      \n \/\/\u4ece"$"\u540e\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb，\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u540d<\/span>
      \n std::<\/span>string name =<\/span> op.<\/span>substr<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u7528getenv\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u503c<\/span>
      \n const<\/span> char<\/span>*<\/span> value =<\/span> getenv<\/span>(<\/span>name.<\/span>c_str<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>value)<\/span>
      \n std::<\/span>cout <<<\/span> value <<<\/span> std::<\/span>endl;<\/span>
      \n }<\/span>
      \n else<\/span> \/\/ \u6253\u5370\u5b57\u7b26\u4e32<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> op <<<\/span> std::<\/span>endl;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \/\/\u5185\u5efa\u547d\u4ee4\u5904\u7406<\/span>
      \nbool<\/span> CheckAndExecBuiltin<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n \/\/\u53d6\u51fa\u547d\u4ee4\u884c\u53c2\u6570\u8868\u7684\u9996\u5143\u7d20，\u5224\u65ad\u662f\u5426\u4e3a\u5185\u5efa\u547d\u4ee4，\u5982\u679c\u662f，\u5219\u76f4\u63a5\u6267\u884c<\/span>
      \n std::<\/span>string str =<\/span> g_argv[<\/span>0<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>str ==<\/span> "cd"<\/span>)<\/span>
      \n {<\/span>
      \n Cd<\/span>(<\/span>)<\/span>;<\/span>
      \n return<\/span> true<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>str ==<\/span> "echo"<\/span>)<\/span>
      \n {<\/span>
      \n Echo<\/span>(<\/span>)<\/span>;<\/span>
      \n return<\/span> true<\/span>;<\/span>
      \n }<\/span>
      \n \/\/else if(…)<\/span>
      \n return<\/span> false<\/span>;<\/span> \/\/ \u4e0d\u662f\u5185\u5efa\u547d\u4ee4，\u76f4\u63a5\u8fd4\u56de<\/span>
      \n}<\/span><\/p>\n

      \/\/\u6267\u884c\u975e\u5185\u5efa\u547d\u4ee4<\/span>
      \nvoid<\/span> Execute<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b<\/span>
      \n pid_t id =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>id <<\/span> 0<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u521b\u5efa\u5b50\u8fdb\u7a0b\u5931\u8d25，\u76f4\u63a5\u9000\u51fa<\/span>
      \n exit<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span> if<\/span>(<\/span>id ==<\/span> 0<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u5b50\u8fdb\u7a0b — \u901a\u8fc7\u7a0b\u5e8f\u66ff\u6362\u6267\u884c\u6307\u4ee4<\/span>
      \n execvp<\/span>(<\/span>g_argv[<\/span>0<\/span>]<\/span>,<\/span> g_argv)<\/span>;<\/span>
      \n }<\/span>
      \n else<\/span>
      \n {<\/span>
      \n \/\/\u7236\u8fdb\u7a0b — \u7b49\u5f85\u5b50\u8fdb\u7a0b，\u5e76\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u4fe1\u606f<\/span>
      \n int<\/span> status =<\/span> 0<\/span>;<\/span>
      \n pid_t rid =<\/span> waitpid<\/span>(<\/span>id,<\/span> &<\/span>status,<\/span> 0<\/span>)<\/span>;<\/span>
      \n if<\/span>(<\/span>rid ><\/span> 0<\/span>)<\/span> \/\/ \u7b49\u5f85\u6210\u529f<\/span>
      \n {<\/span>
      \n \/\/\u5c06\u9000\u51fa\u4fe1\u606f\u5b58\u5165\u5168\u5c40exit_code<\/span>
      \n exit_code =<\/span> WEXITSTATUS<\/span>(<\/span>status)<\/span>;<\/span>
      \n }<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      int<\/span> main<\/span>(<\/span>)<\/span>
      \n{<\/span>
      \n while<\/span>(<\/span>true<\/span>)<\/span>
      \n {<\/span>
      \n \/\/\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26<\/span>
      \n PrintCommandPrompt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

      \/\/\u8bfb\u5165\u547d\u4ee4<\/span>
      \n char<\/span> command[<\/span>1024<\/span>]<\/span>;<\/span>
      \n if<\/span>(<\/span>!<\/span>GetCommandLine<\/span>(<\/span>command,<\/span> sizeof<\/span> command)<\/span>)<\/span> \/\/ \u82e5\u8bfb\u53d6\u9519\u8bef，\u5c31continue\u91cd\u65b0\u8bfb\u53d6<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u8f93\u5165\u9519\u8bef"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u8f93\u5165\u7684\u547d\u4ee4\u884c<\/span>
      \n \/\/ std::cout << command << std::endl;<\/span><\/p>\n

      \/\/\u547d\u4ee4\u884c\u89e3\u6790<\/span>
      \n if<\/span>(<\/span>!<\/span>CommandParse<\/span>(<\/span>command)<\/span>)<\/span>
      \n {<\/span>
      \n std::<\/span>cout <<<\/span> "\u547d\u4ee4\u884c\u89e3\u6790\u5931\u8d25"<\/span> <<<\/span> std::<\/span>endl;<\/span>
      \n continue<\/span>;<\/span>
      \n }<\/span>
      \n \/\/ \/\/\u6253\u5370\u89e3\u6790\u7ed3\u679c<\/span>
      \n \/\/ for(int i = 0; i < g_argc; i++)<\/span>
      \n \/\/ {<\/span>
      \n \/\/ std::cout << g_argv[i] << std::endl;<\/span>
      \n \/\/ }<\/span><\/p>\n

      \/\/\u5185\u5efa\u547d\u4ee4\u7684\u5904\u7406<\/span>
      \n if<\/span>(<\/span>CheckAndExecBuiltin<\/span>(<\/span>)<\/span>)<\/span>
      \n {<\/span>
      \n continue<\/span>;<\/span> \/\/ \u662f\u5185\u5efa\u547d\u4ee4，\u6267\u884c\u5b8c\u6bd5\u5c31\u56de\u53bb\u91cd\u65b0\u6253\u5370\u63d0\u793a\u7b26<\/span>
      \n }<\/span><\/p>\n

      \/\/\u4e0d\u662f\u5185\u5efa\u547d\u4ee4，\u7531\u5b50\u8fdb\u7a0b\u5904\u7406<\/span>
      \n Execute<\/span>(<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n return<\/span> 0<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u603b\u7ed3<\/h2>\n

      \u672c\u7bc7\u6587\u7ae0，\u6211\u4eec\u57fa\u4e8e\u4e4b\u524d\u5b66\u4e60\u7684Linux\u8fdb\u7a0b\u76f8\u5173\u6982\u5ff5\u4ee5\u53ca\u8fdb\u7a0b\u63a7\u5236\u63a5\u53e3，\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u6613\u7248\u7684shell\u3002\u672c\u6b21\u5b9e\u73b0\u8ba9\u6211\u4eec\u5bf9Shell\u7684\u8fd0\u884c\u539f\u7406\u6709\u4e86\u66f4\u6df1\u523b\u7684\u7406\u89e3\u3002\u4e4b\u540e\u535a\u4e3b\u4f1a\u548c\u5927\u5bb6\u4e00\u8d77\u5f00\u542f\u65b0\u7bc7\u7ae0，\u6b63\u5f0f\u8fdb\u5165Linux\u5185\u5b58\u7ba1\u7406\u4ee5\u53ca\u6587\u4ef6\u7ba1\u7406\u7684\u5927\u95e8\u3002\u5982\u679c\u4f60\u89c9\u5f97\u535a\u4e3b\u8bb2\u7684\u8fd8\u4e0d\u9519，\u5c31\u8bf7\u7559\u4e0b\u4e00\u4e2a\u5c0f\u5c0f\u7684\u8d5e\u5728\u8d70\u54e6，\u611f\u8c22\u5927\u5bb6\u7684\u652f\u6301\u2764\u2764\u2764<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb955\u6b21\uff0c\u70b9\u8d5e42\u6b21\uff0c\u6536\u85cf37\u6b21\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u5982\u4f55\u57fa\u4e8eLinux\u8fdb\u7a0b\u63a7\u5236\u63a5\u53e3\u5b9e\u73b0\u4e00\u4e2a\u7b80\u6613\u7684Shell\u3002\u9996\u5148\u5206\u6790\u4e86Bash\u7684\u5de5\u4f5c\u6d41\u7a0b\uff0c\u5305\u62ec\u6253\u5370\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u3001\u83b7\u53d6\u7528\u6237\u8f93\u5165\u3001\u89e3\u6790\u547d\u4ee4\u884c\u3001\u6267\u884c\u547d\u4ee4\u7b49\u6b65\u9aa4\u3002\u63a5\u7740\uff0c\u901a\u8fc7\u4ee3\u7801\u5b9e\u73b0\u4e86\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u7684\u6253\u5370\u3001\u7528\u6237\u8f93\u5165\u7684\u83b7\u53d6\u4ee5\u53ca\u547d\u4ee4\u884c\u7684\u89e3\u6790\u3002\u5177\u4f53\u5b9e\u73b0\u4e2d\uff0c\u4f7f\u7528getenv\u51fd\u6570\u83b7\u53d6\u73af\u5883\u53d8\u91cf\u4e2d\u7684\u7528\u6237\u540d\u3001\u4e3b\u673a\u540d\u548c\u8def\u5f84\uff0c\u5e76\u901a\u8fc7fgets\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u7684\u547d\u4ee4\u884c\uff0c\u6700\u540e\u4f7f\u7528strtok\u51fd\u6570\u5bf9\u547d\u4ee4\u884c\u8fdb\u884c\u5206\u5272\uff0c\u63d0\u53d6\u51fa\u547d\u4ee4\u548c\u53c2\u6570\u3002\u8be5\u7b80\u6613Shell\u867d\u7136\u529f\u80fd\u7b80\u5355\uff0c\u4f46\u6709\u52a9\u4e8e\u6df1\u5165\u7406\u89e3Shell\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n","protected":false},"author":2,"featured_media":38070,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[130,58,44],"topic":[],"class_list":["post-38083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-chrome","tag-linux","tag-44"],"yoast_head":"\n\u3010Linux\u3011\u7b80\u6613\u7248Shell\u5b9e\u73b0\uff08\u9644\u6e90\u7801\uff09 - 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