{"id":84876,"date":"2026-07-26T19:40:37","date_gmt":"2026-07-26T11:40:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/84876.html"},"modified":"2026-07-26T19:40:37","modified_gmt":"2026-07-26T11:40:37","slug":"linux%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%bb%9f-shell%e7%bc%96%e7%a8%8b%e4%b9%8b%e6%9d%a1%e4%bb%b6%e5%88%a4%e6%96%ad%e3%80%81%e5%be%aa%e7%8e%af%e4%b8%8e%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/84876.html","title":{"rendered":"Linux\u64cd\u4f5c\u7cfb\u7edf-shell\u7f16\u7a0b\u4e4b\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570"},"content":{"rendered":"<h2>Linux Shell \u7f16\u7a0b&#xff1a;\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570\u5b9e\u6218\u6307\u5357<\/h2>\n<p>\u5728 Linux \u8fd0\u7ef4\u548c\u5f00\u53d1\u4e2d&#xff0c;Shell \u811a\u672c\u662f\u81ea\u52a8\u5316\u4efb\u52a1\u7684\u5229\u5668\u3002\u65e0\u8bba\u4f60\u662f\u521d\u5b66\u8005\u8fd8\u662f\u6709\u4e00\u5b9a\u7ecf\u9a8c\u7684\u5f00\u53d1\u8005&#xff0c;\u719f\u7ec3\u638c\u63e1 test\u3001\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u7ed3\u6784\u4ee5\u53ca\u51fd\u6570\u5c01\u88c5&#xff0c;\u90fd\u80fd\u8ba9\u4f60\u7684\u811a\u672c\u66f4\u5065\u58ee\u3001\u66f4\u9ad8\u6548\u3002<\/p>\n<ul>\n<li>\u6761\u4ef6\u5224\u65ad&#xff08;\u5982 if\u3001case&#xff09;\u8ba9\u811a\u672c\u80fd\u591f\u6839\u636e\u4e0d\u540c\u7684\u7cfb\u7edf\u72b6\u6001\u6216\u8f93\u5165\u505a\u51fa\u51b3\u7b56&#xff0c;\u907f\u514d\u786c\u7f16\u7801\u903b\u8f91&#xff0c;\u4ece\u800c\u63d0\u5347\u811a\u672c\u7684\u9002\u5e94\u6027\u548c\u5065\u58ee\u6027\u3002<\/li>\n<li>\u5faa\u73af\u7ed3\u6784&#xff08;\u5982 for\u3001while\u3001until&#xff09;\u4f7f\u4f60\u80fd\u591f\u9ad8\u6548\u5730\u5904\u7406\u91cd\u590d\u6027\u4efb\u52a1&#xff0c;\u4f8b\u5982\u6279\u91cf\u5904\u7406\u6587\u4ef6\u6216\u76d1\u63a7\u8fdb\u7a0b\u72b6\u6001&#xff0c;\u6781\u5927\u5730\u63d0\u5347\u4e86\u81ea\u52a8\u5316\u6548\u7387\u3002<\/li>\n<li>\u51fd\u6570\u5c01\u88c5\u5c06\u590d\u6742\u7684\u64cd\u4f5c\u6a21\u5757\u5316&#xff0c;\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u590d\u7528\u6027&#xff0c;\u8fd8\u8ba9\u811a\u672c\u7ed3\u6784\u66f4\u6e05\u6670&#xff0c;\u4fbf\u4e8e\u8c03\u8bd5\u548c\u7ef4\u62a4&#xff0c;\u662f\u6784\u5efa\u5927\u578b\u3001\u5065\u58ee\u811a\u672c\u7684\u57fa\u77f3\u3002\u672c\u6587\u5c06\u7cfb\u7edf\u68b3\u7406\u8fd9\u4e9b\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u5e76\u8f85\u4ee5\u5927\u91cf\u793a\u4f8b&#xff0c;\u52a9\u4f60\u5feb\u901f\u4e0a\u624b\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>1. test \u547d\u4ee4\u4e0e\u6761\u4ef6\u6d4b\u8bd5<\/h3>\n<p>Shell \u4e2d\u7684\u6761\u4ef6\u6d4b\u8bd5\u4e3b\u8981\u901a\u8fc7 test \u547d\u4ee4\u6216\u5176\u7b49\u4ef7\u5f62\u5f0f [ ] \u6765\u5b9e\u73b0\u3002\u6b64\u5916&#xff0c;Bash \u8fd8\u63d0\u4f9b\u4e86\u589e\u5f3a\u7248 [[ ]]&#xff0c;\u652f\u6301\u66f4\u591a\u7279\u6027\u3002<\/p>\n<h4>1.1 test \u548c [ ] \u7684\u57fa\u672c\u7528\u6cd5<\/h4>\n<p><span class=\"token builtin class-name\">test<\/span> \u6761\u4ef6\u8868\u8fbe\u5f0f<br \/>\n<span class=\"token comment\"># \u6216<\/span><br \/>\n<span class=\"token punctuation\">[<\/span> \u6761\u4ef6\u8868\u8fbe\u5f0f <span class=\"token punctuation\">]<\/span>   <span class=\"token comment\"># \u6ce8\u610f\u62ec\u53f7\u4e0e\u8868\u8fbe\u5f0f\u4e4b\u95f4\u5fc5\u987b\u6709\u7a7a\u683c<\/span><\/p>\n<p>\u5e38\u7528\u6d4b\u8bd5\u7c7b\u578b&#xff1a;<\/p>\n<ul>\n<li>\u6587\u4ef6\u6d4b\u8bd5&#xff1a;-f&#xff08;\u666e\u901a\u6587\u4ef6&#xff09;\u3001-d&#xff08;\u76ee\u5f55&#xff09;\u3001-e&#xff08;\u5b58\u5728&#xff09;\u3001-r&#xff08;\u53ef\u8bfb&#xff09;\u3001-w(\u53ef\u5199)\u3001-x&#xff08;\u53ef\u6267\u884c&#xff09; \u7b49\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u6d4b\u8bd5&#xff1a;-z&#xff08;\u7a7a\u4e32&#xff09;\u3001-n&#xff08;\u975e\u7a7a&#xff09;\u3001&#061;&#061;&#xff08;\u76f8\u7b49&#xff09;\u3001!&#061;&#xff08;\u4e0d\u7b49&#xff09;\u3002<\/li>\n<li>\u6570\u503c\u6d4b\u8bd5&#xff1a;-eq&#xff08;\u7b49\u4e8e&#xff09;\u3001-ne&#xff08;\u4e0d\u7b49&#xff09;\u3001-gt&#xff08;\u5927\u4e8e&#xff09;\u3001-lt&#xff08;\u5c0f\u4e8e&#xff09;\u3001-ge&#xff08;\u2265&#xff09;\u3001-le&#xff08;\u2264&#xff09;\u3002<\/li>\n<li>\u6587\u4ef6\u6bd4\u8f83&#xff1a;<\/li>\n<\/ul>\n<p><span class=\"token operator\">&gt;<\/span> <span class=\"token parameter variable\">-nt<\/span>  <span class=\"token comment\"># test file1 -nt file2    \u6d4b\u8bd5file1\u662f\u5426\u6bd4file2\u65b0<\/span><br \/>\n<span class=\"token operator\">&gt;<\/span> <span class=\"token parameter variable\">-ot<\/span>  <span class=\"token comment\"># test file1 -ot file2    \u6d4b\u8bd5file1\u662f\u5426\u6bd4file2\u65e7<\/span><br \/>\n<span class=\"token operator\">&gt;<\/span> <span class=\"token parameter variable\">-ef<\/span>  <span class=\"token comment\"># \u6d4b\u8bd5file1\u548cfile2\u662f\u5426\u4e3a\u540c\u4e00\u4e2a\u6587\u4ef6\u3002<\/span><\/p>\n<ul>\n<li>\u591a\u91cd\u6761\u4ef6\u5224\u65ad&#xff1a;<\/li>\n<\/ul>\n<p><span class=\"token parameter variable\">-a<\/span> <span class=\"token builtin class-name\">:<\/span> <span class=\"token builtin class-name\">test<\/span> <span class=\"token parameter variable\">-r<\/span> <span class=\"token function\">file<\/span> <span class=\"token parameter variable\">-a<\/span> <span class=\"token parameter variable\">-x<\/span> <span class=\"token function\">file<\/span><br \/>\n<span class=\"token parameter variable\">-o<\/span> <span class=\"token builtin class-name\">:<\/span> <span class=\"token builtin class-name\">test<\/span> <span class=\"token parameter variable\">-r<\/span> <span class=\"token function\">file<\/span> <span class=\"token parameter variable\">-o<\/span> <span class=\"token parameter variable\">-x<\/span> <span class=\"token function\">file<\/span><br \/>\n<span class=\"token operator\">!<\/span>  <span class=\"token builtin class-name\">:<\/span> <span class=\"token builtin class-name\">test<\/span> <span class=\"token parameter variable\">-r<\/span> <span class=\"token function\">file<\/span> <span class=\"token operator\">!<\/span> <span class=\"token parameter variable\">-x<\/span> <span class=\"token function\">file<\/span><\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token punctuation\">[<\/span> <span class=\"token parameter variable\">-f<\/span> \/etc\/passwd <span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u5b58\u5728&#034;<\/span><br \/>\n<span class=\"token punctuation\">[<\/span> <span class=\"token string\">&#034;<span class=\"token environment constant\">$USER<\/span>&#034;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;root&#034;<\/span> <span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u5f53\u524d\u662f root&#034;<\/span><br \/>\n<span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$#<\/span> <span class=\"token parameter variable\">-eq<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6ca1\u6709\u4f20\u5165\u53c2\u6570&#034;<\/span><\/p>\n<h4>1.2 [[ ]] \u589e\u5f3a\u6d4b\u8bd5&#xff08;Bash \u7279\u6709&#xff09;<\/h4>\n<p>[[ ]] \u662f Bash \u7684\u5173\u952e\u5b57&#xff0c;\u6bd4 [ ] \u66f4\u667a\u80fd&#xff1a;<\/p>\n<ul>\n<li>\u652f\u6301 &amp;&amp;\u3001|| \u903b\u8f91\u8fd0\u7b97\u7b26&#xff08;[ ] \u5185\u5fc5\u987b\u7528 -a\u3001-o&#xff09;\u3002<\/li>\n<li>\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f &#061;~\u3002<\/li>\n<li>\u652f\u6301\u901a\u914d\u7b26\u5339\u914d&#xff08;\u5982 [[ $str &#061;&#061; a* ]]&#xff09;\u3002<\/li>\n<li>\u53d8\u91cf\u5f15\u7528\u65f6\u53ef\u4ee5\u4e0d\u52a0\u53cc\u5f15\u53f7&#xff08;\u4f46\u5efa\u8bae\u52a0&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token parameter variable\">-z<\/span> <span class=\"token string\">&#034;<span class=\"token variable\">$var<\/span>&#034;<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;var \u4e3a\u7a7a&#034;<\/span><br \/>\n<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$num<\/span> <span class=\"token parameter variable\">-gt<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token variable\">$num<\/span> <span class=\"token parameter variable\">-lt<\/span> <span class=\"token number\">20<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;num \u5728 10~20 \u4e4b\u95f4&#034;<\/span><br \/>\n<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$file<\/span> <span class=\"token operator\">&#061;&#061;<\/span> *.txt <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u662f txt \u6587\u4ef6&#034;<\/span><\/p>\n<hr \/>\n<h3>2.shell\u811a\u672c<\/h3>\n<p>shell\u811a\u672c\u53ef\u4ee5\u7b80\u5355\u7684\u7406\u89e3\u4e3a\u6279\u5904\u7406\u7a0b\u5e8f&#xff0c;\u4f7f\u7528shell\u811a\u672c\u53ef\u4ee5\u505a\u5982\u4e0b\u4e00\u4e9b\u529f\u80fd&#xff1a;<\/p>\n<p>   &#xff08;1&#xff09;\u81ea\u52a8\u5316\u7ba1\u7406&#xff1b;<br \/>\n   &#xff08;2&#xff09;\u7ba1\u7406\u7cfb\u7edf&#xff1b;<br \/>\n   &#xff08;3&#xff09;\u7b80\u5355\u7684\u5165\u4fb5\u4fa6\u6d4b\u529f\u80fd&#xff1b;<br \/>\n   &#xff08;4&#xff09;\u8fde\u7eed\u6307\u4ee4\u5355\u4e00\u5316&#xff1b;<br \/>\n   &#xff08;5&#xff09;\u7b80\u5355\u7684\u8d44\u6599\u5904\u7406\u3002<\/p>\n<p>shell\u811a\u672c\u6ce8\u610f\u4e8b\u9879&#xff1a;<\/p>\n<p>\u6307\u4ee4\u6267\u884c\u662f\u4ece\u4e0a\u5230\u4e0b\u3001\u4ece\u5de6\u5230\u53f3\u5206\u6790\u6267\u884c\u7684&#xff1b;<br \/>\n\u6307\u4ee4\u3001\u9009\u9879\u4e0e\u53c2\u6570\u95f4\u7684\u591a\u4e2a\u7a7a\u767d\u4f1a\u88ab\u5ffd\u7565\u6389&#xff1b;<br \/>\n\u7a7a\u767d\u884c\u4e5f\u4f1a\u88ab\u5ffd\u7565\u7684&#xff1b;<br \/>\n\u5982\u679c\u8bfb\u53d6\u5230\u4e00\u4e2aenter&#xff0c;\u5c31\u5c1d\u8bd5\u6267\u884c\u8be5\u884c\u547d\u4ee4&#xff1b;<br \/>\n#\u53ef\u4f5c\u4e3a\u6ce8\u91ca&#xff0c;#\u540e\u9762\u7684\u6587\u5b57\u90fd\u4f1a\u88ab\u5ffd\u7565\u3002<\/p>\n<p>shell\u811a\u672c\u6267\u884c&#xff1a;<\/p>\n<p>\u7edd\u5bf9\u8def\u5f84\u4e0b\u8fbe\u6267\u884c&#xff1a;\/home\/zhang\/shell.sh<br \/>\n\u76f8\u5bf9\u8def\u5f84\u4e0b\u8fbe\u6267\u884c&#xff1a;.\/shell.sh<br \/>\n\u5c06shell.sh\u653e\u5165PATH\u76ee\u5f55<br \/>\n\u4ee5bash\u7a0b\u5f0f\u6267\u884c&#xff1a;bash shell.sh\u6216sh shell.sh<br \/>\n\u6ce8\u610f&#xff1a;\u4ee5\u4e0a\u6267\u884c\u65b9\u5f0f\u4e2d&#xff0c;\u7b2c1-3\u79cd\u65b9\u6cd5\u9700\u8981\u7ed9\u811a\u672c\u8d4b\u4e88\u6267\u884c\u6743\u9650\u624d\u80fd\u6267\u884c&#xff0c;\u7b2c4\u79cd\u65b9\u5f0f\u4e0d\u9700\u8981\u6267\u884c\u6743\u9650\u3002<\/p>\n<p>SHELL\u8bed\u6cd5&#xff1a;<\/p>\n<p>  <span class=\"token comment\">#!\/bin\/bash         #\u5ba3\u544a\u8fd9\u4e2ashell\u811a\u672c\u4f7f\u7528\u7684shell\u540d\u79f0<\/span><br \/>\n  \u7a0b\u5e8f\u8bf4\u660e             <span class=\"token comment\">#\u7a0b\u5e8f\u529f\u80fd&#xff0c;\u7a0b\u5e8f\u7248\u672c&#xff0c;\u4f5c\u8005\u7b49\u8bf4\u660e<\/span><br \/>\n  \u73af\u5883\u53d8\u91cf\u5ba3\u544a          <span class=\"token comment\">#PATH&#061;\/bin:\/usr\/local\/bin&#8230;&#8230;&#8230;.<\/span><br \/>\n  \u4e3b\u7a0b\u5e8f\u90e8\u5206            <span class=\"token comment\">#\u4e3b\u8981\u7a0b\u5e8f<\/span><br \/>\n  \u6267\u884c\u6210\u679c\u544a\u77e5          <span class=\"token comment\">#\u5b9a\u4e49\u8fd4\u56de\u503c exit 0, exit n<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;#!\/bin\/bash \u79f0\u4e3aShebang&#xff0c;\u662f Linux\/Unix \u7cfb\u7edf\u4e2d\u811a\u672c\u6587\u4ef6\u7684\u7b2c\u4e00\u884c\u7279\u6b8a\u6807\u8bb0&#xff0c;\u7531 #! \u5f00\u5934&#xff0c;\u540e\u63a5\u89e3\u91ca\u5668\u7684\u7edd\u5bf9\u8def\u5f84&#xff0c;\u5b83\u7684\u6838\u5fc3\u4f5c\u7528\u662f\u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf\u200c\u4f7f\u7528\u54ea\u4e2a\u89e3\u91ca\u5668\u6765\u6267\u884c\u8be5\u811a\u672c\u200c\u3002\u4e3b\u7a0b\u5e8f\u90e8\u5206\u662fshell\u811a\u672c\u529f\u80fd\u7684\u5b9e\u73b0\u3002\u8fd9\u4e24\u4e2a\u90e8\u5206\u662fshell\u811a\u672c\u5fc5\u987b\u8981\u6709\u7684\u90e8\u5206&#xff0c;\u5176\u4ed6\u90e8\u5206\u53ef\u9009&#xff0c;\u4f46\u4e00\u822c\u4e3a\u4e86\u811a\u672c\u89c4\u8303\u53ca\u540e\u671f\u7ef4\u62a4&#xff0c;\u7a0b\u5e8f\u8bf4\u660e\u3001\u73af\u5883\u53d8\u91cf\u5ba3\u544a\u4e5f\u4f1a\u6dfb\u52a0\u5728\u811a\u672c\u4e2d\u3002<br \/>\n\u5982\u4e0b\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u811a\u672c\u8bf4\u660eshell\u811a\u672c\u7ed3\u6784&#xff1a;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260726114035-6a65f233900b8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>3. \u6761\u4ef6\u5224\u65ad&#xff1a;if \u8bed\u53e5<\/h3>\n<p>if \u8bed\u53e5\u6839\u636e\u547d\u4ee4\u7684\u9000\u51fa\u72b6\u6001\u7801&#xff08;0 \u4e3a\u771f&#xff0c;\u975e 0 \u4e3a\u5047&#xff09;\u6765\u51b3\u5b9a\u6267\u884c\u8def\u5f84\u3002<\/p>\n<h4>3.1 \u57fa\u672c\u7ed3\u6784<\/h4>\n<p><span class=\"token keyword\">if<\/span> \u6761\u4ef6<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    \u547d\u4ee4<br \/>\n<span class=\"token keyword\">elif<\/span> \u6761\u4ef6<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    \u547d\u4ee4<br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    \u547d\u4ee4<br \/>\n<span class=\"token keyword\">fi<\/span><\/p>\n<h4>3.2 \u5b9e\u6218\u793a\u4f8b<\/h4>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token builtin class-name\">read<\/span> <span class=\"token parameter variable\">-p<\/span> <span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57: &#034;<\/span> num<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$num<\/span> <span class=\"token parameter variable\">-eq<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u96f6&#034;<\/span><br \/>\n<span class=\"token keyword\">elif<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$num<\/span> <span class=\"token parameter variable\">-gt<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6b63\u6570&#034;<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u8d1f\u6570&#034;<\/span><br \/>\n<span class=\"token keyword\">fi<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;if \u540e\u53ef\u4ee5\u76f4\u63a5\u8ddf\u547d\u4ee4&#xff0c;\u800c\u4e0d\u53ea\u662f test\u3001[]\u3001[[]]&#xff0c;\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-q<\/span> <span class=\"token string\">&#034;error&#034;<\/span> \/var\/log\/messages<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u53d1\u73b0\u9519\u8bef\u65e5\u5fd7&#034;<\/span><br \/>\n<span class=\"token keyword\">fi<\/span><\/p>\n<hr \/>\n<h3>4. \u591a\u5206\u652f\u9009\u62e9&#xff1a;case \u8bed\u53e5<\/h3>\n<p>\u5f53\u5206\u652f\u8f83\u591a\u65f6&#xff0c;case \u6bd4\u5d4c\u5957 if-elif \u66f4\u6e05\u6670\u3002<\/p>\n<h4>4.1 \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">case<\/span> \u53d8\u91cf <span class=\"token keyword\">in<\/span><br \/>\n    \u6a21\u5f0f1<span class=\"token punctuation\">)<\/span><br \/>\n        \u547d\u4ee4<span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    \u6a21\u5f0f2<span class=\"token punctuation\">)<\/span><br \/>\n        \u547d\u4ee4<span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    *<span class=\"token punctuation\">)<\/span><br \/>\n        \u9ed8\u8ba4\u547d\u4ee4<span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">esac<\/span><\/p>\n<h4>4.2 \u793a\u4f8b&#xff1a;\u670d\u52a1\u7ba1\u7406\u811a\u672c<\/h4>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token variable\">$1<\/span> <span class=\"token keyword\">in<\/span><br \/>\n    start<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u542f\u52a8\u670d\u52a1&#8230;&#034;<\/span><br \/>\n        systemctl start myapp<br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    stop<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u505c\u6b62\u670d\u52a1&#8230;&#034;<\/span><br \/>\n        systemctl stop myapp<br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    restart<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u91cd\u542f\u670d\u52a1&#8230;&#034;<\/span><br \/>\n        systemctl restart myapp<br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    status<span class=\"token punctuation\">)<\/span><br \/>\n        systemctl status myapp<br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    *<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u7528\u6cd5: <span class=\"token variable\">$0<\/span> {start|stop|restart|status}&#034;<\/span><br \/>\n        <span class=\"token builtin class-name\">exit<\/span> <span class=\"token number\">1<\/span><br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">esac<\/span><\/p>\n<p>\u6a21\u5f0f\u652f\u6301\u901a\u914d\u7b26&#xff08;*\u3001?\u3001[]&#xff09;\u548c\u7ad6\u7ebf | \u8868\u793a\u6216&#xff0c;\u4f8b\u5982 [yY]|[yY][eE][sS])\u3002<\/p>\n<hr \/>\n<h3>5. \u5faa\u73af\u7ed3\u6784<\/h3>\n<h4>5.1 for \u5faa\u73af<\/h4>\n<p>for \u7528\u4e8e\u904d\u5386\u5217\u8868\u6216\u6570\u503c\u8303\u56f4\u3002<\/p>\n<p>\u904d\u5386\u5217\u8868&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token for-or-select variable\">name<\/span> <span class=\"token keyword\">in<\/span> Alice Bob Charlie<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;Hello, <span class=\"token variable\">$name<\/span>&#034;<\/span><br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<p><span class=\"token comment\"># \u904d\u5386\u6587\u4ef6<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token for-or-select variable\">file<\/span> <span class=\"token keyword\">in<\/span> *.txt<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;Processing <span class=\"token variable\">$file<\/span>&#034;<\/span><br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<p>C \u98ce\u683c for&#xff08;Bash \u652f\u6301&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token variable\"><span class=\"token punctuation\">((<\/span>i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">))<\/span><\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u7b2c <span class=\"token variable\">$i<\/span> \u6b21\u8fed\u4ee3&#034;<\/span><br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<p>\u5b9e\u7528\u793a\u4f8b&#xff1a;\u6279\u91cf\u91cd\u547d\u540d&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token for-or-select variable\">f<\/span> <span class=\"token keyword\">in<\/span> *.jpg<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token function\">mv<\/span> <span class=\"token string\">&#034;<span class=\"token variable\">$f<\/span>&#034;<\/span> <span class=\"token string\">&#034;<span class=\"token variable\">${f<span class=\"token operator\">%<\/span>.jpg}<\/span>.png&#034;<\/span><br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<hr \/>\n<h4>5.2 while \u5faa\u73af<\/h4>\n<p>\u5f53\u6761\u4ef6\u4e3a\u771f\u65f6\u6301\u7eed\u6267\u884c\u3002<\/p>\n<p>\u8bed\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">while<\/span> \u6761\u4ef6<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    \u547d\u4ee4<br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<p>\u793a\u4f8b&#xff1a;\u9010\u884c\u8bfb\u53d6\u6587\u4ef6&#xff1a;<\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token assign-left variable\"><span class=\"token environment constant\">IFS<\/span><\/span><span class=\"token operator\">&#061;<\/span> <span class=\"token builtin class-name\">read<\/span> <span class=\"token parameter variable\">-r<\/span> line<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u884c\u5185\u5bb9: <span class=\"token variable\">$line<\/span>&#034;<\/span><br \/>\n<span class=\"token keyword\">done<\/span> <span class=\"token operator\">&lt;<\/span> \/etc\/passwd<\/p>\n<p>\u65e0\u9650\u5faa\u73af&#xff1a;<\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6309 Ctrl&#043;C \u9000\u51fa&#034;<\/span><br \/>\n    <span class=\"token function\">sleep<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<hr \/>\n<h4>5.3 until \u5faa\u73af<\/h4>\n<p>\u4e0e while \u76f8\u53cd&#xff0c;\u5f53\u6761\u4ef6\u4e3a\u5047\u65f6\u6267\u884c&#xff0c;\u76f4\u5230\u6761\u4ef6\u53d8\u4e3a\u771f\u3002<\/p>\n<p>\u8bed\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">until<\/span> \u6761\u4ef6<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    \u547d\u4ee4<br \/>\n<span class=\"token keyword\">done<\/span><\/p>\n<p>\u793a\u4f8b&#xff1a;\u7b49\u5f85\u67d0\u4e2a\u8fdb\u7a0b\u9000\u51fa&#xff1a;<\/p>\n<p><span class=\"token keyword\">until<\/span> <span class=\"token operator\">!<\/span> pgrep <span class=\"token parameter variable\">-x<\/span> <span class=\"token string\">&#034;myprocess&#034;<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u8fdb\u7a0b\u4ecd\u5728\u8fd0\u884c&#xff0c;\u7b49\u5f85\u4e2d&#8230;&#034;<\/span><br \/>\n    <span class=\"token function\">sleep<\/span> <span class=\"token number\">2<\/span><br \/>\n<span class=\"token keyword\">done<\/span><br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u8fdb\u7a0b\u5df2\u9000\u51fa&#034;<\/span><\/p>\n<hr \/>\n<h3>6. \u51fd\u6570\u5c01\u88c5<\/h3>\n<p>\u51fd\u6570\u4f7f\u811a\u672c\u6a21\u5757\u5316&#xff0c;\u63d0\u9ad8\u590d\u7528\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<h4>6.1 \u5b9a\u4e49\u4e0e\u8c03\u7528<\/h4>\n<p>\u5b9a\u4e49\u683c\u5f0f&#xff08;\u4e24\u79cd\u5747\u53ef&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function-name function\">func_name<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\"># \u547d\u4ee4<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\"># \u6216<\/span><br \/>\n<span class=\"token function-name function\">func_name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\"># \u547d\u4ee4<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528&#xff1a;\u76f4\u63a5\u4f7f\u7528\u51fd\u6570\u540d&#xff0c;\u5982 func_name\u3002<\/p>\n<h4>6.2 \u53c2\u6570\u4e0e\u8fd4\u56de\u503c<\/h4>\n<ul>\n<li>\u53c2\u6570\u901a\u8fc7 $1\u3001$2 \u2026 \u83b7\u53d6&#xff0c;$# \u53c2\u6570\u4e2a\u6570&#xff0c;$&#064; \u6240\u6709\u53c2\u6570\u3002<\/li>\n<li>return \u8fd4\u56de\u6570\u5b57\u72b6\u6001\u7801&#xff08;0~255&#xff09;&#xff0c;echo \u8fd4\u56de\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;\u52a0\u6cd5\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token function-name function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">sum<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$((<\/span> $<span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> $<span class=\"token number\">2<\/span> <span class=\"token variable\">))<\/span><\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token variable\">$sum<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token assign-left variable\">result<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">add<\/span> <span class=\"token number\">3<\/span> <span class=\"token number\">5<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;3&#043;5&#061;<span class=\"token variable\">$result<\/span>&#034;<\/span><\/p>\n<p>\u5e26\u9519\u8bef\u5904\u7406\u7684\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token function-name function\">check_file<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token parameter variable\">-f<\/span> <span class=\"token string\">&#034;<span class=\"token variable\">$1<\/span>&#034;<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n        <span class=\"token builtin class-name\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u9519\u8bef&#xff1a;\u6587\u4ef6 <span class=\"token variable\">$1<\/span> \u4e0d\u5b58\u5728&#034;<\/span> <span class=\"token operator\">&gt;<\/span><span class=\"token file-descriptor important\">&amp;2<\/span><br \/>\n        <span class=\"token builtin class-name\">return<\/span> <span class=\"token number\">1<\/span><br \/>\n    <span class=\"token keyword\">fi<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> check_file <span class=\"token string\">&#034;\/etc\/hosts&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u6b63\u5e38&#034;<\/span><br \/>\n<span class=\"token keyword\">fi<\/span><\/p>\n<h4>6.3 \u53d8\u91cf\u4f5c\u7528\u57df<\/h4>\n<p>\u9ed8\u8ba4\u5168\u5c40\u53d8\u91cf&#xff0c;\u4f7f\u7528 local \u58f0\u660e\u5c40\u90e8\u53d8\u91cf&#xff08;\u4ec5\u5728\u51fd\u6570\u5185\u6709\u6548&#xff09;\u3002<\/p>\n<p><span class=\"token function-name function\">my_func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">var<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u5c40\u90e8&#034;<\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token variable\">$var<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token assign-left variable\">var<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\u5168\u5c40&#034;<\/span><br \/>\nmy_func   <span class=\"token comment\"># \u8f93\u51fa &#034;\u5c40\u90e8&#034;<\/span><br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token variable\">$var<\/span> <span class=\"token comment\"># \u8f93\u51fa &#034;\u5168\u5c40&#034;<\/span><\/p>\n<hr \/>\n<h3>7. \u7efc\u5408\u5b9e\u6218&#xff1a;\u7cfb\u7edf\u5065\u5eb7\u68c0\u67e5\u811a\u672c<\/h3>\n<p>\u7ed3\u5408\u4ee5\u4e0a\u6240\u6709\u77e5\u8bc6\u70b9&#xff0c;\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684\u7cfb\u7edf\u68c0\u67e5\u811a\u672c\u3002<\/p>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token comment\"># \u7cfb\u7edf\u5065\u5eb7\u68c0\u67e5<\/span><\/p>\n<p><span class=\"token comment\"># \u51fd\u6570&#xff1a;\u68c0\u67e5\u78c1\u76d8\u4f7f\u7528\u7387<\/span><br \/>\n<span class=\"token function-name function\">check_disk<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">threshold<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">80<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">usage<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">df<\/span> <span class=\"token parameter variable\">-h<\/span> \/ <span class=\"token operator\">|<\/span> <span class=\"token function\">awk<\/span> <span class=\"token string\">&#039;NR&#061;&#061;2 {print $5}&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">sed<\/span> <span class=\"token string\">&#039;s\/%\/\/&#039;<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token variable\">$usage<\/span> <span class=\"token parameter variable\">-gt<\/span> <span class=\"token variable\">$threshold<\/span> <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">then<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u8b66\u544a&#xff1a;\u6839\u5206\u533a\u4f7f\u7528\u7387\u5df2\u8fbe <span class=\"token variable\">${usage}<\/span>%&#034;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6839\u5206\u533a\u4f7f\u7528\u7387\u6b63\u5e38 (<span class=\"token variable\">${usage}<\/span>%)&#034;<\/span><br \/>\n    <span class=\"token keyword\">fi<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\"># \u51fd\u6570&#xff1a;\u68c0\u67e5\u5185\u5b58<\/span><br \/>\n<span class=\"token function-name function\">check_memory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">total<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">free<\/span> <span class=\"token parameter variable\">-m<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">awk<\/span> <span class=\"token string\">&#039;\/^Mem:\/{print $2}&#039;<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">used<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">free<\/span> <span class=\"token parameter variable\">-m<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">awk<\/span> <span class=\"token string\">&#039;\/^Mem:\/{print $3}&#039;<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">percent<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$((<\/span> used <span class=\"token operator\">*<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">\/<\/span> total <span class=\"token variable\">))<\/span><\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u5185\u5b58\u4f7f\u7528\u7387: <span class=\"token variable\">${percent}<\/span>%&#034;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\"># \u51fd\u6570&#xff1a;\u68c0\u67e5\u8fd0\u884c\u7684\u8fdb\u7a0b\u6570<\/span><br \/>\n<span class=\"token function-name function\">check_processes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin class-name\">local<\/span> <span class=\"token assign-left variable\">count<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">ps<\/span> aux <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> <span class=\"token parameter variable\">-l<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n    <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u5f53\u524d\u8fdb\u7a0b\u6570: <span class=\"token variable\">$count<\/span>&#034;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\"># \u4e3b\u5faa\u73af&#xff1a;\u6bcf\u96945\u79d2\u68c0\u67e5\u4e00\u6b21&#xff08;\u6309\u9700\u4fee\u6539&#xff09;<\/span><br \/>\n<span class=\"token function-name function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n        <span class=\"token function\">clear<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u7cfb\u7edf\u5065\u5eb7\u72b6\u6001 &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#034;<\/span><br \/>\n        check_disk<br \/>\n        check_memory<br \/>\n        check_processes<br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#034;<\/span><br \/>\n        <span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#034;\u6309 Ctrl&#043;C \u9000\u51fa&#034;<\/span><br \/>\n        <span class=\"token function\">sleep<\/span> <span class=\"token number\">5<\/span><br \/>\n    <span class=\"token keyword\">done<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\"># \u6267\u884c\u4e3b\u51fd\u6570<\/span><br \/>\nmain<\/p>\n<hr \/>\n<h3>8. \u6700\u4f73\u5b9e\u8df5\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u5f15\u53f7\u4fdd\u62a4\u53d8\u91cf&#xff1a;\u59cb\u7ec8\u7528\u53cc\u5f15\u53f7\u5305\u56f4\u53d8\u91cf&#xff0c;\u9632\u6b62\u7a7a\u683c\u6216\u7279\u6b8a\u5b57\u7b26\u5bfc\u81f4\u9519\u8bef&#xff0c;\u5982 &#034;$var&#034;\u3002<\/li>\n<li>\u4f7f\u7528 [[ ]] \u4ee3\u66ff [ ]&#xff08;\u5728 Bash \u811a\u672c\u4e2d&#xff09;\u4ee5\u907f\u514d\u590d\u6742\u7684\u8f6c\u4e49\u548c\u903b\u8f91\u9519\u8bef\u3002<\/li>\n<li>\u51fd\u6570\u5e94\u8fd4\u56de\u72b6\u6001\u7801&#xff1a;\u901a\u8fc7 return \u8fd4\u56de\u6210\u529f\/\u5931\u8d25&#xff0c;\u4fbf\u4e8e\u8c03\u7528\u8005\u5224\u65ad\u3002<\/li>\n<li>\u907f\u514d\u4f7f\u7528 test \u7684 -a \u548c -o&#xff0c;\u6539\u7528 &amp;&amp; \u548c ||&#xff08;\u5728 [[ ]] \u4e2d\u6216\u72ec\u7acb\u547d\u4ee4&#xff09;\u3002<\/li>\n<li>\u8c03\u8bd5\u6280\u5de7&#xff1a;\u4f7f\u7528 set -x \u5f00\u542f\u8ddf\u8e2a&#xff0c;set -e \u4f7f\u811a\u672c\u9047\u9519\u5373\u9000\u51fa\u3002<\/li>\n<li>\u811a\u672c\u5934\u90e8&#xff1a;\u4f7f\u7528 #!\/bin\/bash \u6307\u660e\u89e3\u91ca\u5668&#xff0c;\u5e76\u6dfb\u52a0 set -o pipefail \u589e\u5f3a\u9519\u8bef\u5904\u7406\u3002<\/li>\n<hr \/>\n<h3>\u7ed3\u8bed<\/h3>\n<p>Shell \u811a\u672c\u4e2d\u7684\u6761\u4ef6\u6d4b\u8bd5\u3001\u5206\u652f\u5224\u65ad\u3001\u5faa\u73af\u548c\u51fd\u6570\u662f\u6784\u5efa\u81ea\u52a8\u5316\u4efb\u52a1\u7684\u56db\u5927\u57fa\u77f3\u3002\u901a\u8fc7\u672c\u6587\u7684\u68b3\u7406\u548c\u793a\u4f8b&#xff0c;\u5e0c\u671b\u4f60\u5bf9\u8fd9\u4e9b\u7ed3\u6784\u6709\u4e86\u66f4\u6e05\u6670\u7684\u8ba4\u8bc6\u3002\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d&#xff0c;\u591a\u5199\u591a\u7ec3&#xff0c;\u7ed3\u5408\u7cfb\u7edf\u7ba1\u7406\u9700\u6c42\u4e0d\u65ad\u4f18\u5316&#xff0c;\u4f60\u7684\u811a\u672c\u529f\u529b\u5b9a\u4f1a\u4e0e\u65e5\u4ff1\u589e\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6709\u4efb\u4f55\u7591\u95ee\u6216\u60f3\u6df1\u5165\u4e86\u89e3\u67d0\u4e2a\u4e3b\u9898&#xff0c;\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u4ea4\u6d41&#xff01;<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Linux Shell \u7f16\u7a0b&#xff1a;\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570\u5b9e\u6218\u6307\u5357<br \/>\n\u5728 Linux \u8fd0\u7ef4\u548c\u5f00\u53d1\u4e2d&#xff0c;Shell \u811a\u672c\u662f\u81ea\u52a8\u5316\u4efb\u52a1\u7684\u5229\u5668\u3002\u65e0\u8bba\u4f60\u662f\u521d\u5b66\u8005\u8fd8\u662f\u6709\u4e00\u5b9a\u7ecf\u9a8c\u7684\u5f00\u53d1\u8005&#xff0c;\u719f\u7ec3\u638c\u63e1 test\u3001\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u7ed3\u6784\u4ee5\u53ca\u51fd\u6570\u5c01\u88c5&#xff0c;\u90fd\u80fd\u8ba9\u4f60\u7684\u811a\u672c\u66f4\u5065\u58ee\u3001\u66f4\u9ad8\u6548\u3002<br \/>\n\u6761\u4ef6\u5224\u65ad&#xff08;\u5982 if\u3001case&#xff09;\u8ba9\u811a\u672c\u80fd\u591f\u6839\u636e\u4e0d\u540c\u7684\u7cfb\u7edf\u72b6\u6001\u6216\u8f93\u5165\u505a\u51fa\u51b3\u7b56&#xff0c;\u907f\u514d\u786c\u7f16\u7801\u903b\u8f91&#xff0c;\u4ece\u800c\u63d0\u5347\u811a\u672c\u7684\u9002\u5e94\u6027\u548c\u5065\u58ee\u6027\u3002<\/p>\n","protected":false},"author":2,"featured_media":84875,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[352,58,97,43,44],"topic":[],"class_list":["post-84876","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-bash","tag-linux","tag-97","tag-43","tag-44"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux\u64cd\u4f5c\u7cfb\u7edf-shell\u7f16\u7a0b\u4e4b\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/84876.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u64cd\u4f5c\u7cfb\u7edf-shell\u7f16\u7a0b\u4e4b\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"Linux Shell \u7f16\u7a0b&#xff1a;\u6761\u4ef6\u5224\u65ad\u3001\u5faa\u73af\u4e0e\u51fd\u6570\u5b9e\u6218\u6307\u5357 \u5728 Linux \u8fd0\u7ef4\u548c\u5f00\u53d1\u4e2d&#xff0c;Shell 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