{"id":787,"date":"2023-11-06T21:05:51","date_gmt":"2023-07-28T17:40:01","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8linux%e4%b8%ad%e7%9a%84-dev-null\/"},"modified":"2025-08-03T07:52:03","modified_gmt":"2025-08-02T23:52:03","slug":"%e5%9c%a8linux%e4%b8%ad%e7%9a%84-dev-null","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8linux%e4%b8%ad%e7%9a%84-dev-null\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3Linux\u4e2d\u7684\/dev\/null\u7a7a\u8bbe\u5907\uff1a\u529f\u80fd\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"<h1>\u6df1\u5165\u7406\u89e3Linux\u4e2d\u7684\/dev\/null<\/h1>\n<p>\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\/dev\/null\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u7a7a\u8bbe\u5907\u6587\u4ef6\u3002\u4efb\u4f55\u5199\u5165\u5230\u8be5\u6587\u4ef6\u7684\u5185\u5bb9\u90fd\u4f1a\u88ab\u7cfb\u7edf\u4e22\u5f03\uff0c\u800c\u5728\u5c1d\u8bd5\u8bfb\u53d6\u5b83\u65f6\uff0c\u7cfb\u7edf\u4f1a\u7acb\u5373\u8fd4\u56de\u6587\u4ef6\u7ed3\u675f\u7b26\uff08EOF\uff09\u3002<\/p>\n<p>\u8fd9\u4e2a\u8bbe\u5907\u6587\u4ef6\u53ef\u4ee5\u88ab\u89c6\u4e3a\u547d\u4ee4\u884c\u73af\u5883\u4e2d\u7684\u4e00\u4e2a\u5f3a\u5927\u5de5\u5177\uff0c\u5c31\u50cf\u4e00\u4e2a\u6570\u5b57\u9ed1\u6d1e\uff0c\u80fd\u591f\u541e\u566c\u6240\u6709\u88ab\u91cd\u5b9a\u5411\u5230\u5b83\u7684\u6570\u636e\u6d41\u3002<\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\/dev\/null\u7684\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u5728Linux\u7cfb\u7edf\u4e2d\u7684\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002<\/p>\n<hr \/>\n<h2>\/dev\/null \u7684\u57fa\u672c\u5c5e\u6027<\/h2>\n<p>\u5f53\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528cat\u547d\u4ee4\u8bfb\u53d6\/dev\/null\u65f6\uff0c\u5b83\u4f1a\u7acb\u5373\u8fd4\u56de\u4e00\u4e2a\u6587\u4ef6\u7ed3\u675f\u7b26\uff08EOF\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u8981\u786e\u8ba4\u8fd9\u662f\u4e00\u4e2a\u6709\u6548\u7684\u6587\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528stat\u547d\u4ee4\u8fdb\u884c\u9a8c\u8bc1\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">stat<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u6267\u884c\u4e0a\u8ff0\u547d\u4ee4\u540e\uff0c\u7cfb\u7edf\u4f1a\u8fd4\u56de\u4ee5\u4e0b\u4fe1\u606f\uff1a<\/p>\n<pre class=\"post-pre\"><code>  \u6587\u4ef6: \/dev\/null\r\n  \u5927\u5c0f: <span class=\"token number\">0<\/span>               \u5757: <span class=\"token number\">0<\/span>          IO \u5757: <span class=\"token number\">4096<\/span>   \u5b57\u7b26\u7279\u6b8a\u6587\u4ef6\r\n\u8bbe\u5907: 6h\/6d   Inode: <span class=\"token number\">5<\/span>           \u94fe\u63a5: <span class=\"token number\">1<\/span>     \u8bbe\u5907\u7c7b\u578b: <span class=\"token number\">1,3<\/span>\r\n\u8bbf\u95ee: <span class=\"token punctuation\">(<\/span>0666\/crw-rw-rw-<span class=\"token punctuation\">)<\/span>  Uid: <span class=\"token punctuation\">(<\/span>    <span class=\"token number\">0<\/span>\/    root<span class=\"token punctuation\">)<\/span>   Gid: <span class=\"token punctuation\">(<\/span>    <span class=\"token number\">0<\/span>\/    root<span class=\"token punctuation\">)<\/span>\r\n\u8bbf\u95ee: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\n\u4fee\u6539: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\n\u53d8\u66f4: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\n<\/code><\/pre>\n<p>\u4ece\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\/dev\/null\u6587\u4ef6\u7684\u5927\u5c0f\u4e3a0\u5b57\u8282\uff0c\u6ca1\u6709\u5206\u914d\u4efb\u4f55\u5b58\u50a8\u5757\u3002\u6587\u4ef6\u6743\u9650\u8bbe\u7f6e\u4e3a0666\uff0c\u610f\u5473\u7740\u6240\u6709\u7528\u6237\u90fd\u53ef\u4ee5\u8bfb\u5199\u8be5\u6587\u4ef6\uff0c\u4f46\u65e0\u6cd5\u6267\u884c\u5b83\u3002<\/p>\n<p>\u7531\u4e8e\/dev\/null\u4e0d\u662f\u4e00\u4e2a\u53ef\u6267\u884c\u6587\u4ef6\uff0c\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528\u7ba1\u9053\u64cd\u4f5c\u7b26\uff08|\uff09\u5c06\u6570\u636e\u91cd\u5b9a\u5411\u5230\u5b83\u3002\u552f\u4e00\u7684\u65b9\u5f0f\u662f\u4f7f\u7528\u6587\u4ef6\u91cd\u5b9a\u5411\u7b26\u53f7\uff08&gt;\u3001&gt;&gt;\u3001&lt;\u3001&lt;&lt;\uff09\u3002<\/p>\n<p>\u4e0b\u56fe\u5c55\u793a\u4e86\/dev\/null\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u786e\u662f\u4e00\u4e2a\u6709\u6548\u7684\u7279\u6b8a\u6587\u4ef6\uff1a<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Linux\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\/dev\/null\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656484bba4b2f92e6c73017a\/14-0.png\" alt=\"Linux\u6587\u4ef6\u7cfb\u7edf\u8868\" \/><\/div>\n<p>\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u63a2\u8ba8\/dev\/null\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u9014\u3002<\/p>\n<hr \/>\n<h2>\u5728Linux\u4e2d\u91cd\u5b9a\u5411\u8f93\u51fa\u5230\/dev\/null<\/h2>\n<p>\u901a\u8fc7\u5c06\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\/dev\/null\uff0c\u6211\u4eec\u53ef\u4ee5\u4e22\u5f03\u811a\u672c\u6216\u547d\u4ee4\u4ea7\u751f\u7684\u4efb\u4f55\u8f93\u51fa\u4fe1\u606f\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u6280\u5de7\u6765\u4e22\u5f03echo\u547d\u4ee4\u7684\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">'\u6b22\u8fce\u6765\u5230Linux\u4e16\u754c'<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u6267\u884c\u4e0a\u8ff0\u547d\u4ee4\u540e\uff0c\u4f60\u5c06\u4e0d\u4f1a\u770b\u5230\u4efb\u4f55\u8f93\u51fa\uff0c\u56e0\u4e3a\u5b83\u5df2\u7ecf\u88ab\/dev\/null&#8221;\u541e\u566c&#8221;\u4e86\uff01<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u5c1d\u8bd5\u4ee5\u9519\u8bef\u7684\u65b9\u5f0f\u8fd0\u884c\u4e00\u4e2a\u547d\u4ee4\uff0c\u5e76\u5c06\u5176\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\/dev\/null\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--\u9519\u8bef\u9009\u9879<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u6211\u4eec\u4ecd\u7136\u4f1a\u5728\u7ec8\u7aef\u770b\u5230\u4ee5\u4e0b\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n<pre class=\"post-pre\"><code>cat: \u65e0\u6cd5\u8bc6\u522b\u7684\u9009\u9879 <span class=\"token string\">'--\u9519\u8bef\u9009\u9879'<\/span>\r\n\u5c1d\u8bd5\u6267\u884c <span class=\"token string\">'cat --help'<\/span> \u6765\u83b7\u53d6\u66f4\u591a\u4fe1\u606f\u3002\r\n<\/code><\/pre>\n<p>\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u5462\uff1f\u8fd9\u662f\u56e0\u4e3a\u9519\u8bef\u6d88\u606f\u6765\u81ea\u4e8e\u6807\u51c6\u9519\u8bef\u6d41\uff08stderr\uff09\uff0c\u800c\u6211\u4eec\u53ea\u5ffd\u7565\u4e86\u6807\u51c6\u8f93\u51fa\u6d41\uff08stdout\uff09\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u4e3a\u4e86\u5b8c\u5168\u4e22\u5f03\u6240\u6709\u8f93\u51fa\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u8003\u8651\u6807\u51c6\u9519\u8bef\u6d41\u3002<\/p>\n<h3>\u4e22\u5f03\u9519\u8bef\u4fe1\u606f<\/h3>\n<p>\u8ba9\u6211\u4eec\u5c06\u6807\u51c6\u9519\u8bef\u6d41\uff08stderr\uff09\u548c\u6807\u51c6\u8f93\u51fa\u6d41\uff08stdout\uff09\u90fd\u91cd\u5b9a\u5411\u5230\/dev\/null\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6807\u51c6\u9519\u8bef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u6570\u503c\u4e3a2\uff09\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--\u9519\u8bef\u9009\u9879<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null <span class=\"token operator\"><span class=\"token file-descriptor important\">2<\/span>&gt;<\/span>\/dev\/null\r\n<\/code><\/pre>\n<p>\u6267\u884c\u4e0a\u8ff0\u547d\u4ee4\u540e\uff0c\u6211\u4eec\u5c06\u4e0d\u4f1a\u770b\u5230\u4efb\u4f55\u8f93\u51fa\uff0c\u8fd9\u6b63\u662f\u6211\u4eec\u60f3\u8981\u7684\u6548\u679c\uff01<\/p>\n<p>\u8fd8\u6709\u53e6\u4e00\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u76f8\u540c\u7684\u6548\u679c\uff1a\u9996\u5148\u5c06stderr\u91cd\u5b9a\u5411\u5230stdout\uff0c\u7136\u540e\u5c06stdout\u91cd\u5b9a\u5411\u5230\/dev\/null\u3002<\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>\u547d\u4ee4 &gt; \/dev\/null 2&gt;&amp;1\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\u672b\u5c3e\u7684<code>2&gt;&amp;1<\/code>\u90e8\u5206\u3002\u8fd9\u91cc\u6211\u4eec\u5c06\u6807\u51c6\u9519\u8bef\u6d41\uff08\u6587\u4ef6\u63cf\u8ff0\u7b262\uff09\u91cd\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa\u6d41\uff08\u6587\u4ef6\u63cf\u8ff0\u7b261\uff09\u3002\u6211\u4eec\u4f7f\u7528<code>&amp;1<\/code>\u6765\u544a\u8bc9Shell\uff0c\u6211\u4eec\u7684\u76ee\u6807\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u800c\u4e0d\u662f\u540d\u4e3a&#8221;1&#8243;\u7684\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--\u9519\u8bef\u9009\u9879<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null <span class=\"token operator\"><span class=\"token file-descriptor important\">2<\/span>&gt;<\/span><span class=\"token file-descriptor important\">&amp;1<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u4f7f\u7528<code>2&gt;1<\/code>\uff08\u6ca1\u6709&amp;\u7b26\u53f7\uff09\uff0c\u90a3\u4e48Shell\u4f1a\u5c06stderr\u91cd\u5b9a\u5411\u5230\u4e00\u4e2a\u540d\u4e3a&#8221;1&#8243;\u7684\u6587\u4ef6\uff0c\u800c\u4e0d\u662f\u6807\u51c6\u8f93\u51fa\u6d41\u3002\u8fd9\u663e\u7136\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u7ed3\u679c\uff01<\/p>\n<hr \/>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u76f8\u4fe1\u4f60\u5df2\u7ecf\u5bf9Linux\u7cfb\u7edf\u4e2d\u7684\/dev\/null\u6709\u4e86\u66f4\u6df1\u5165\u7684\u7406\u89e3\uff0c\u5e76\u638c\u63e1\u4e86\u5982\u4f55\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u4f7f\u7528\u5b83\u3002\/dev\/null\u4f5c\u4e3a\u4e00\u4e2a\u7279\u6b8a\u7684\u8bbe\u5907\u6587\u4ef6\uff0c\u5728\u7cfb\u7edf\u7ba1\u7406\u3001\u811a\u672c\u7f16\u5199\u548c\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u90fd\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5bf9\u672c\u6587\u5185\u5bb9\u6709\u4efb\u4f55\u7591\u95ee\u6216\u5efa\u8bae\uff0c\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u8ba8\u8bba\u3002<\/p>\n<hr \/>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<ul class=\"post-ul\">\n<li>StackOverflow\u76f8\u5173\u8ba8\u8bba<\/li>\n<li>Linux man\u624b\u518c<\/li>\n<li>\u300aLinux\u547d\u4ee4\u884c\u4e0eShell\u811a\u672c\u7f16\u7a0b\u5927\u5168\u300b<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u7406\u89e3Linux\u4e2d\u7684\/dev\/null \u5728Linux\u7cfb\u7edf\u4e2d\uff0c\/dev\/null\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u7a7a\u8bbe\u5907\u6587\u4ef6\u3002\u4efb\u4f55\u5199 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2101,311,1387,2102,198],"class_list":{"0":"post-787","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-dev-null","8":"tag-linux","10":"tag-2102","11":"tag-198"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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