{"id":134,"date":"2019-02-10T18:07:44","date_gmt":"2019-02-10T10:07:44","guid":{"rendered":"http:\/\/b.yesiyu.top\/?p=134"},"modified":"2019-02-10T18:07:44","modified_gmt":"2019-02-10T10:07:44","slug":"shell-%e8%be%93%e5%85%a5%e8%be%93%e5%87%ba%e9%87%8d%e5%ae%9a%e5%90%91","status":"publish","type":"post","link":"https:\/\/b.yesiyu.top\/?p=134","title":{"rendered":"Shell \u8f93\u5165\/\u8f93\u51fa\u91cd\u5b9a\u5411"},"content":{"rendered":"<h1>Shell \u8f93\u5165\/\u8f93\u51fa\u91cd\u5b9a\u5411<\/h1>\n<p>\u5927\u591a\u6570 UNIX \u7cfb\u7edf\u547d\u4ee4\u4ece\u4f60\u7684\u7ec8\u7aef\u63a5\u53d7\u8f93\u5165\u5e76\u5c06\u6240\u4ea7\u751f\u7684\u8f93\u51fa\u53d1\u9001\u56de\u200b\u200b\u5230\u60a8\u7684\u7ec8\u7aef\u3002\u4e00\u4e2a\u547d\u4ee4\u901a\u5e38\u4ece\u4e00\u4e2a\u53eb\u6807\u51c6\u8f93\u5165\u7684\u5730\u65b9\u8bfb\u53d6\u8f93\u5165\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8fd9\u6070\u597d\u662f\u4f60\u7684\u7ec8\u7aef\u3002\u540c\u6837\uff0c\u4e00\u4e2a\u547d\u4ee4\u901a\u5e38\u5c06\u5176\u8f93\u51fa\u5199\u5165\u5230\u6807\u51c6\u8f93\u51fa\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e5f\u662f\u4f60\u7684\u7ec8\u7aef\u3002<\/p>\n<p>\u91cd\u5b9a\u5411\u547d\u4ee4\u5217\u8868\u5982\u4e0b\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u547d\u4ee4<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<tr>\n<td>command &gt; file<\/td>\n<td>\u5c06\u8f93\u51fa\u91cd\u5b9a\u5411\u5230 file\u3002<\/td>\n<\/tr>\n<tr>\n<td>command &lt; file<\/td>\n<td>\u5c06\u8f93\u5165\u91cd\u5b9a\u5411\u5230 file\u3002<\/td>\n<\/tr>\n<tr>\n<td>command &gt;&gt; file<\/td>\n<td>\u5c06\u8f93\u51fa\u4ee5\u8ffd\u52a0\u7684\u65b9\u5f0f\u91cd\u5b9a\u5411\u5230 file\u3002<\/td>\n<\/tr>\n<tr>\n<td>n &gt; file<\/td>\n<td>\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a n \u7684\u6587\u4ef6\u91cd\u5b9a\u5411\u5230 file\u3002<\/td>\n<\/tr>\n<tr>\n<td>n &gt;&gt; file<\/td>\n<td>\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a n \u7684\u6587\u4ef6\u4ee5\u8ffd\u52a0\u7684\u65b9\u5f0f\u91cd\u5b9a\u5411\u5230 file\u3002<\/td>\n<\/tr>\n<tr>\n<td>n &gt;&amp; m<\/td>\n<td>\u5c06\u8f93\u51fa\u6587\u4ef6 m \u548c n \u5408\u5e76\u3002<\/td>\n<\/tr>\n<tr>\n<td>n &lt;&amp; m<\/td>\n<td>\u5c06\u8f93\u5165\u6587\u4ef6 m \u548c n \u5408\u5e76\u3002<\/td>\n<\/tr>\n<tr>\n<td>&lt;&lt; tag<\/td>\n<td>\u5c06\u5f00\u59cb\u6807\u8bb0 tag \u548c\u7ed3\u675f\u6807\u8bb0 tag \u4e4b\u95f4\u7684\u5185\u5bb9\u4f5c\u4e3a\u8f93\u5165\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p>\u9700\u8981\u6ce8\u610f\u7684\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26 0 \u901a\u5e38\u662f\u6807\u51c6\u8f93\u5165\uff08STDIN\uff09\uff0c1 \u662f\u6807\u51c6\u8f93\u51fa\uff08STDOUT\uff09\uff0c2 \u662f\u6807\u51c6\u9519\u8bef\u8f93\u51fa\uff08STDERR\uff09\u3002<\/p><\/blockquote>\n<hr \/>\n<h2>\u8f93\u51fa\u91cd\u5b9a\u5411<\/h2>\n<p>\u91cd\u5b9a\u5411\u4e00\u822c\u901a\u8fc7\u5728\u547d\u4ee4\u95f4\u63d2\u5165\u7279\u5b9a\u7684\u7b26\u53f7\u6765\u5b9e\u73b0\u3002\u7279\u522b\u7684\uff0c\u8fd9\u4e9b\u7b26\u53f7\u7684\u8bed\u6cd5\u5982\u4e0b\u6240\u793a:<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">command1 <\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\"> file1<\/span><\/pre>\n<p>\u4e0a\u9762\u8fd9\u4e2a\u547d\u4ee4\u6267\u884ccommand1\u7136\u540e\u5c06\u8f93\u51fa\u7684\u5185\u5bb9\u5b58\u5165file1\u3002<\/p>\n<p>\u6ce8\u610f\u4efb\u4f55file1\u5185\u7684\u5df2\u7ecf\u5b58\u5728\u7684\u5185\u5bb9\u5c06\u88ab\u65b0\u5185\u5bb9\u66ff\u4ee3\u3002\u5982\u679c\u8981\u5c06\u65b0\u5185\u5bb9\u6dfb\u52a0\u5728\u6587\u4ef6\u672b\u5c3e\uff0c\u8bf7\u4f7f\u7528&gt;&gt;\u64cd\u4f5c\u7b26\u3002<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u6267\u884c\u4e0b\u9762\u7684 who \u547d\u4ee4\uff0c\u5b83\u5c06\u547d\u4ee4\u7684\u5b8c\u6574\u7684\u8f93\u51fa\u91cd\u5b9a\u5411\u5728\u7528\u6237\u6587\u4ef6\u4e2d(users):<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ who <\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\"> users<\/span><\/pre>\n<p>\u6267\u884c\u540e\uff0c\u5e76\u6ca1\u6709\u5728\u7ec8\u7aef\u8f93\u51fa\u4fe1\u606f\uff0c\u8fd9\u662f\u56e0\u4e3a\u8f93\u51fa\u5df2\u88ab\u4ece\u9ed8\u8ba4\u7684\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\uff08\u7ec8\u7aef\uff09\u91cd\u5b9a\u5411\u5230\u6307\u5b9a\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528 cat \u547d\u4ee4\u67e5\u770b\u6587\u4ef6\u5185\u5bb9\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ cat users\r\n_mbsetupuser console  <\/span><span class=\"typ\">Oct<\/span> <span class=\"lit\">31<\/span> <span class=\"lit\">17<\/span><span class=\"pun\">:<\/span><span class=\"lit\">35<\/span><span class=\"pln\"> \r\ntianqixin    console  <\/span><span class=\"typ\">Oct<\/span> <span class=\"lit\">31<\/span> <span class=\"lit\">17<\/span><span class=\"pun\">:<\/span><span class=\"lit\">35<\/span><span class=\"pln\"> \r\ntianqixin    ttys000  <\/span><span class=\"typ\">Dec<\/span>  <span class=\"lit\">1<\/span> <span class=\"lit\">11<\/span><span class=\"pun\">:<\/span><span class=\"lit\">33<\/span><\/pre>\n<p>\u8f93\u51fa\u91cd\u5b9a\u5411\u4f1a\u8986\u76d6\u6587\u4ef6\u5185\u5bb9\uff0c\u8bf7\u770b\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ echo <\/span><span class=\"str\">\"\u83dc\u9e1f\u6559\u7a0b\uff1awww.runoob.com\"<\/span> <span class=\"pun\">&gt;<\/span><span class=\"pln\"> users\r\n$ cat users\r\n<\/span><span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b\uff1a<\/span><span class=\"pln\">www<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com\r\n$<\/span><\/pre>\n<p>\u5982\u679c\u4e0d\u5e0c\u671b\u6587\u4ef6\u5185\u5bb9\u88ab\u8986\u76d6\uff0c\u53ef\u4ee5\u4f7f\u7528 &gt;&gt; \u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ echo <\/span><span class=\"str\">\"\u83dc\u9e1f\u6559\u7a0b\uff1awww.runoob.com\"<\/span> <span class=\"pun\">&gt;&gt;<\/span><span class=\"pln\"> users\r\n$ cat users\r\n<\/span><span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b\uff1a<\/span><span class=\"pln\">www<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com\r\n<\/span><span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b\uff1a<\/span><span class=\"pln\">www<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com\r\n$<\/span><\/pre>\n<hr \/>\n<h2>\u8f93\u5165\u91cd\u5b9a\u5411<\/h2>\n<p>\u548c\u8f93\u51fa\u91cd\u5b9a\u5411\u4e00\u6837\uff0cUnix \u547d\u4ee4\u4e5f\u53ef\u4ee5\u4ece\u6587\u4ef6\u83b7\u53d6\u8f93\u5165\uff0c\u8bed\u6cd5\u4e3a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">command1 <\/span><span class=\"pun\">&lt;<\/span><span class=\"pln\"> file1<\/span><\/pre>\n<p>\u8fd9\u6837\uff0c\u672c\u6765\u9700\u8981\u4ece\u952e\u76d8\u83b7\u53d6\u8f93\u5165\u7684\u547d\u4ee4\u4f1a\u8f6c\u79fb\u5230\u6587\u4ef6\u8bfb\u53d6\u5185\u5bb9\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u8f93\u51fa\u91cd\u5b9a\u5411\u662f\u5927\u4e8e\u53f7(&gt;)\uff0c\u8f93\u5165\u91cd\u5b9a\u5411\u662f\u5c0f\u4e8e\u53f7(&lt;)\u3002<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u63a5\u7740\u4ee5\u4e0a\u5b9e\u4f8b\uff0c\u6211\u4eec\u9700\u8981\u7edf\u8ba1 users \u6587\u4ef6\u7684\u884c\u6570,\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ wc <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l users\r\n       <\/span><span class=\"lit\">2<\/span><span class=\"pln\"> users<\/span><\/pre>\n<p>\u4e5f\u53ef\u4ee5\u5c06\u8f93\u5165\u91cd\u5b9a\u5411\u5230 users \u6587\u4ef6\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$  wc <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l <\/span><span class=\"pun\">&lt;<\/span><span class=\"pln\"> users\r\n       <\/span><span class=\"lit\">2<\/span><\/pre>\n<p>\u6ce8\u610f\uff1a\u4e0a\u9762\u4e24\u4e2a\u4f8b\u5b50\u7684\u7ed3\u679c\u4e0d\u540c\uff1a\u7b2c\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4f1a\u8f93\u51fa\u6587\u4ef6\u540d\uff1b\u7b2c\u4e8c\u4e2a\u4e0d\u4f1a\uff0c\u56e0\u4e3a\u5b83\u4ec5\u4ec5\u77e5\u9053\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6\u5185\u5bb9\u3002<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">command1 <\/span><span class=\"pun\">&lt;<\/span><span class=\"pln\"> infile <\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\"> outfile<\/span><\/pre>\n<p>\u540c\u65f6\u66ff\u6362\u8f93\u5165\u548c\u8f93\u51fa\uff0c\u6267\u884ccommand1\uff0c\u4ece\u6587\u4ef6infile\u8bfb\u53d6\u5185\u5bb9\uff0c\u7136\u540e\u5c06\u8f93\u51fa\u5199\u5165\u5230outfile\u4e2d\u3002<\/p>\n<h3>\u91cd\u5b9a\u5411\u6df1\u5165\u8bb2\u89e3<\/h3>\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e2a Unix\/Linux \u547d\u4ee4\u8fd0\u884c\u65f6\u90fd\u4f1a\u6253\u5f00\u4e09\u4e2a\u6587\u4ef6\uff1a<\/p>\n<ul>\n<li>\u6807\u51c6\u8f93\u5165\u6587\u4ef6(stdin)\uff1astdin\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a0\uff0cUnix\u7a0b\u5e8f\u9ed8\u8ba4\u4ecestdin\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<li>\u6807\u51c6\u8f93\u51fa\u6587\u4ef6(stdout)\uff1astdout \u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a1\uff0cUnix\u7a0b\u5e8f\u9ed8\u8ba4\u5411stdout\u8f93\u51fa\u6570\u636e\u3002<\/li>\n<li>\u6807\u51c6\u9519\u8bef\u6587\u4ef6(stderr)\uff1astderr\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a2\uff0cUnix\u7a0b\u5e8f\u4f1a\u5411stderr\u6d41\u4e2d\u5199\u5165\u9519\u8bef\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0ccommand &gt; file \u5c06 stdout \u91cd\u5b9a\u5411\u5230 file\uff0ccommand &lt; file \u5c06stdin \u91cd\u5b9a\u5411\u5230 file\u3002<\/p>\n<p>\u5982\u679c\u5e0c\u671b stderr \u91cd\u5b9a\u5411\u5230 file\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"lit\">2<\/span> <span class=\"pun\">&gt;<\/span><span class=\"pln\"> file<\/span><\/pre>\n<p>\u5982\u679c\u5e0c\u671b stderr \u8ffd\u52a0\u5230 file \u6587\u4ef6\u672b\u5c3e\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"lit\">2<\/span> <span class=\"pun\">&gt;&gt;<\/span><span class=\"pln\"> file<\/span><\/pre>\n<p><b>2<\/b>\u00a0\u8868\u793a\u6807\u51c6\u9519\u8bef\u6587\u4ef6(stderr)\u3002<\/p>\n<p>\u5982\u679c\u5e0c\u671b\u5c06 stdout \u548c stderr \u5408\u5e76\u540e\u91cd\u5b9a\u5411\u5230 file\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\"> file <\/span><span class=\"lit\">2<\/span><span class=\"pun\">&gt;&amp;<\/span><span class=\"lit\">1<\/span>\r\n\r\n<span class=\"pun\">\u6216\u8005<\/span><span class=\"pln\">\r\n\r\n$ command <\/span><span class=\"pun\">&gt;&gt;<\/span><span class=\"pln\"> file <\/span><span class=\"lit\">2<\/span><span class=\"pun\">&gt;&amp;<\/span><span class=\"lit\">1<\/span><\/pre>\n<p>\u5982\u679c\u5e0c\u671b\u5bf9 stdin \u548c stdout \u90fd\u91cd\u5b9a\u5411\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"pun\">&lt;<\/span><span class=\"pln\"> file1 <\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">file2<\/span><\/pre>\n<p>command \u547d\u4ee4\u5c06 stdin \u91cd\u5b9a\u5411\u5230 file1\uff0c\u5c06 stdout \u91cd\u5b9a\u5411\u5230 file2\u3002<\/p>\n<hr \/>\n<h2>Here Document<\/h2>\n<p>Here Document \u662f Shell \u4e2d\u7684\u4e00\u79cd\u7279\u6b8a\u7684\u91cd\u5b9a\u5411\u65b9\u5f0f\uff0c\u7528\u6765\u5c06\u8f93\u5165\u91cd\u5b9a\u5411\u5230\u4e00\u4e2a\u4ea4\u4e92\u5f0f Shell \u811a\u672c\u6216\u7a0b\u5e8f\u3002<\/p>\n<p>\u5b83\u7684\u57fa\u672c\u7684\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">command <\/span><span class=\"pun\">&lt;&lt;<\/span><span class=\"pln\"> delimiter\r\n    document\r\ndelimiter<\/span><\/pre>\n<p>\u5b83\u7684\u4f5c\u7528\u662f\u5c06\u4e24\u4e2a delimiter \u4e4b\u95f4\u7684\u5185\u5bb9(document) \u4f5c\u4e3a\u8f93\u5165\u4f20\u9012\u7ed9 command\u3002<\/p>\n<blockquote><p>\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u7ed3\u5c3e\u7684delimiter \u4e00\u5b9a\u8981\u9876\u683c\u5199\uff0c\u524d\u9762\u4e0d\u80fd\u6709\u4efb\u4f55\u5b57\u7b26\uff0c\u540e\u9762\u4e5f\u4e0d\u80fd\u6709\u4efb\u4f55\u5b57\u7b26\uff0c\u5305\u62ec\u7a7a\u683c\u548c tab \u7f29\u8fdb\u3002<\/li>\n<li>\u5f00\u59cb\u7684delimiter\u524d\u540e\u7684\u7a7a\u683c\u4f1a\u88ab\u5ffd\u7565\u6389\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u5728\u547d\u4ee4\u884c\u4e2d\u901a\u8fc7 wc -l \u547d\u4ee4\u8ba1\u7b97 Here Document \u7684\u884c\u6570\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ wc <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l <\/span><span class=\"pun\">&lt;&lt;<\/span><span class=\"pln\"> EOF\r\n    <\/span><span class=\"pun\">\u6b22\u8fce\u6765\u5230<\/span>\r\n    <span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b<\/span><span class=\"pln\">\r\n    www<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com\r\nEOF\r\n<\/span><span class=\"lit\">3<\/span>          <span class=\"com\"># \u8f93\u51fa\u7ed3\u679c\u4e3a 3 \u884c<\/span><span class=\"pln\">\r\n$<\/span><\/pre>\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06 Here Document \u7528\u5728\u811a\u672c\u4e2d\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"com\">#!\/bin\/bash<\/span>\r\n<span class=\"com\"># author:\u83dc\u9e1f\u6559\u7a0b<\/span>\r\n<span class=\"com\"># url:www.runoob.com<\/span><span class=\"pln\">\r\n\r\ncat <\/span><span class=\"pun\">&lt;&lt;<\/span><span class=\"pln\"> EOF\r\n<\/span><span class=\"pun\">\u6b22\u8fce\u6765\u5230<\/span>\r\n<span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b<\/span><span class=\"pln\">\r\nwww<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com\r\nEOF<\/span><\/pre>\n<p>\u6267\u884c\u4ee5\u4e0a\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pun\">\u6b22\u8fce\u6765\u5230<\/span>\r\n<span class=\"pun\">\u83dc\u9e1f\u6559\u7a0b<\/span><span class=\"pln\">\r\nwww<\/span><span class=\"pun\">.<\/span><span class=\"pln\">runoob<\/span><span class=\"pun\">.<\/span><span class=\"pln\">com<\/span><\/pre>\n<hr \/>\n<h2>\/dev\/null \u6587\u4ef6<\/h2>\n<p>\u5982\u679c\u5e0c\u671b\u6267\u884c\u67d0\u4e2a\u547d\u4ee4\uff0c\u4f46\u53c8\u4e0d\u5e0c\u671b\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u8f93\u51fa\u7ed3\u679c\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c06\u8f93\u51fa\u91cd\u5b9a\u5411\u5230 \/dev\/null\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"pun\">&gt;<\/span> <span class=\"str\">\/dev\/<\/span><span class=\"kwd\">null<\/span><\/pre>\n<p>\/dev\/null \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u6587\u4ef6\uff0c\u5199\u5165\u5230\u5b83\u7684\u5185\u5bb9\u90fd\u4f1a\u88ab\u4e22\u5f03\uff1b\u5982\u679c\u5c1d\u8bd5\u4ece\u8be5\u6587\u4ef6\u8bfb\u53d6\u5185\u5bb9\uff0c\u90a3\u4e48\u4ec0\u4e48\u4e5f\u8bfb\u4e0d\u5230\u3002\u4f46\u662f \/dev\/null \u6587\u4ef6\u975e\u5e38\u6709\u7528\uff0c\u5c06\u547d\u4ee4\u7684\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u5b83\uff0c\u4f1a\u8d77\u5230&#8221;\u7981\u6b62\u8f93\u51fa&#8221;\u7684\u6548\u679c\u3002<\/p>\n<p>\u5982\u679c\u5e0c\u671b\u5c4f\u853d stdout \u548c stderr\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">$ command <\/span><span class=\"pun\">&gt;<\/span> <span class=\"str\">\/dev\/<\/span><span class=\"kwd\">null<\/span> <span class=\"lit\">2<\/span><span class=\"pun\">&gt;&amp;<\/span><span class=\"lit\">1<\/span><\/pre>\n<blockquote><p><b>\u6ce8\u610f\uff1a<\/b>0 \u662f\u6807\u51c6\u8f93\u5165\uff08STDIN\uff09\uff0c1 \u662f\u6807\u51c6\u8f93\u51fa\uff08STDOUT\uff09\uff0c2 \u662f\u6807\u51c6\u9519\u8bef\u8f93\u51fa\uff08STDERR\uff09\u3002<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Shell \u8f93\u5165\/\u8f93\u51fa\u91cd\u5b9a\u5411 \u5927\u591a\u6570 UNIX \u7cfb\u7edf\u547d\u4ee4\u4ece\u4f60\u7684\u7ec8\u7aef\u63a5\u53d7\u8f93\u5165\u5e76\u5c06\u6240\u4ea7\u751f\u7684\u8f93\u51fa\u53d1\u9001\u56de\u200b\u200b\u5230\u60a8\u7684\u7ec8\u7aef &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/b.yesiyu.top\/?p=134\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cShell \u8f93\u5165\/\u8f93\u51fa\u91cd\u5b9a\u5411\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-134","post","type-post","status-publish","format-standard","hentry","category-liunx-"],"_links":{"self":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/134","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=134"}],"version-history":[{"count":1,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/134\/revisions"}],"predecessor-version":[{"id":135,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/134\/revisions\/135"}],"wp:attachment":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}