{"id":612,"date":"2023-03-14T06:29:31","date_gmt":"2023-05-19T17:51:46","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/linux%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-dev-null\/"},"modified":"2025-08-01T01:04:39","modified_gmt":"2025-07-31T16:04:39","slug":"linux%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-dev-null","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/linux%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-dev-null\/","title":{"rendered":"Linux\u306b\u304a\u3051\u308b\/dev\/null"},"content":{"rendered":"<p>Linux\u306b\u304a\u3051\u308b\/dev\/null\u306f\u3001\u30cc\u30eb\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002\u3053\u308c\u306b\u66f8\u304d\u8fbc\u307e\u308c\u305f\u3082\u306e\u306f\u7834\u68c4\u3055\u308c\u3001\u8aad\u307f\u53d6\u308a\u6642\u306b\u306fEOF\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30cf\u30c3\u30af\u3067\u3001\u6295\u3052\u3089\u308c\u305f\u3082\u306e\u3092\u5438\u3044\u8fbc\u3080\u6383\u9664\u6a5f\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u610f\u5473\u3092\u7406\u89e3\u3057\u3001\u3069\u306e\u3088\u3046\u306b\u6d3b\u7528\u3067\u304d\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<hr \/>\n<h2>\/dev\/null\u306e\u30d7\u30ed\u30d1\u30c6\u30a3<\/h2>\n<p>cat\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u8aad\u307f\u53d6\u308d\u3046\u3068\u3059\u308b\u3068\u3001\u3053\u308c\u306f\u30d5\u30a1\u30a4\u30eb\u306e\u7d42\u7aef\uff08EOF\uff09\u6587\u5b57\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306f\u6709\u52b9\u306a\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002\u3053\u308c\u306f\u691c\u8a3c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">stat<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u79c1\u306f\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>  File: \/dev\/null\r\n  Size: <span class=\"token number\">0<\/span>               Blocks: <span class=\"token number\">0<\/span>          IO Block: <span class=\"token number\">4096<\/span>   character special <span class=\"token function\">file<\/span>\r\nDevice: 6h\/6d   Inode: <span class=\"token number\">5<\/span>           Links: <span class=\"token number\">1<\/span>     Device type: <span class=\"token number\">1,3<\/span>\r\nAccess: <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\nAccess: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\nModify: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\nChange: <span class=\"token number\">2020<\/span>-02-04 <span class=\"token number\">13<\/span>:00:43.112464814 +0530\r\n<\/code><\/pre>\n<p>\u3053\u306e\u3053\u3068\u304b\u3089\u3001\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u30b5\u30a4\u30ba\u304c0\u30d0\u30a4\u30c8\u3067\u3042\u308a\u3001\u5272\u308a\u5f53\u3066\u3089\u308c\u305f\u30d6\u30ed\u30c3\u30af\u3082\u30bc\u30ed\u3067\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u3082\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001\u8ab0\u3067\u3082\u8aad\u307f\u66f8\u304d\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u5b9f\u884c\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u5b9f\u884c\u53ef\u80fd\u306a\u30d5\u30a1\u30a4\u30eb\u3067\u306f\u306a\u3044\u305f\u3081\u3001|\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066\/dev\/null\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u552f\u4e00\u306e\u65b9\u6cd5\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30ea\u30c0\u30a4\u30ec\u30af\u30b7\u30e7\u30f3\uff08&gt;\u3001&gt;&gt;\u3001\u307e\u305f\u306f&lt;\u3001&lt;&lt;\uff09\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u4e0b\u306e\u56f3\u306f\u3001\/dev\/null\u304c\u5b9f\u969b\u306b\u6709\u52b9\u306a\u30d5\u30a1\u30a4\u30eb\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656496c9daa94e2bdf7bfea8\/14-0.png\" alt=\"File Tables\" \/><\/div>\n<p>\u3067\u306f\u3001\/dev\/null \u306e\u4e00\u822c\u7684\u306a\u5229\u7528\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<hr \/>\n<h2>Linux\u3067\u306e\/dev\/null\u3078\u306e\u30ea\u30c0\u30a4\u30ec\u30af\u30c8<\/h2>\n<p>\u79c1\u305f\u3061\u306f\u3001\u4f7f\u7528\u3059\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u51fa\u529b\u3092\/dev\/null\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b\u3053\u3068\u3067\u3001\u4efb\u610f\u306e\u51fa\u529b\u3092\u7834\u68c4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3063\u3066\u30a8\u30b3\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6368\u3066\u308b\u3053\u3068\u3092\u8a66\u3057\u3066\u307f\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">'Hello from JournalDev'<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u304c\u7834\u68c4\u3055\u308c\u308b\u305f\u3081\u3001\u4f55\u306e\u51fa\u529b\u3082\u5f97\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u300c\u30b3\u30de\u30f3\u30c9\u3092\u9593\u9055\u3063\u3066\u5b9f\u884c\u3057\u3066\u3001\u305d\u306e\u51fa\u529b\u3092\/dev\/null\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u300d<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--INCORRECT_OPTION<\/span> <span class=\"token operator\">&gt;<\/span> \/dev\/null\r\n<\/code><\/pre>\n<p>\u79c1\u305f\u3061\u306f\u307e\u3060\u3053\u3046\u3057\u305f\u51fa\u529b\u3092\u5f97\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>cat: unrecognized option <span class=\"token string\">'--INCORRECT'<\/span>\r\nTry <span class=\"token string\">'cat --help'<\/span> <span class=\"token keyword\">for<\/span> <span class=\"token function\">more<\/span> information.\r\n<\/code><\/pre>\n<p>\u306a\u305c\u3053\u308c\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u305d\u308c\u306f\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304cstderr\u304b\u3089\u6765\u3066\u3044\u308b\u304c\u3001\u79c1\u305f\u3061\u306fstdout\u304b\u3089\u306e\u51fa\u529b\u306e\u307f\u3092\u6368\u3066\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306f\u3001stderr\u3082\u8003\u616e\u306b\u5165\u308c\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002 (Watashitachi wa, stderr mo kouryo ni ireru hitsuyou ga arimasu.)<\/p>\n<h3>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u524a\u9664\u3059\u308b<\/h3>\n<p>\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\uff08stderr\uff09\u3092\/dev\/null\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u305f\u3081\u306b\u3001stderr\u306e\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\uff08\uff1d2\uff09\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--INCORRECT_OPTION<\/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>\u3053\u308c\u306f\u79c1\u305f\u3061\u304c\u5fc5\u8981\u3068\u3059\u308b\u3082\u306e\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u307e\u3059\uff01<\/p>\n<p>\u540c\u3058\u3053\u3068\u3092\u3059\u308b\u5225\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u521d\u306b\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b(stderr)\u3092\u6a19\u6e96\u51fa\u529b(stdout)\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u3001\u6b21\u306b\u6a19\u6e96\u51fa\u529b\u3092\/dev\/null\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306e\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>command &gt; \/dev\/null 2&gt;&amp;1\r\n<\/code><\/pre>\n<p>\u672b\u5c3e\u306b\u300c2&gt;&amp;1\u300d\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002\u6211\u3005\u306f\u30c7\u30b8\u30e3\u30fc\u30b8\u30e3\uff082\uff09\u3092\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u30a2\u30a6\u30c8\uff081\uff09\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u307e\u3059\u3002\u30b7\u30a7\u30eb\u306b\u5bfe\u3057\u3066\u3001\u5b9b\u5148\u30d5\u30a1\u30a4\u30eb\u304c\u30d5\u30a1\u30a4\u30eb\u540d\u3067\u306f\u306a\u304f\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3067\u3042\u308b\u3053\u3068\u3092\u4f1d\u3048\u308b\u305f\u3081\u306b\u300c&amp;1\u300d\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token function\">cat<\/span> <span class=\"token parameter variable\">--INCORRECT_OPTION<\/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>\u3082\u30572&gt;1\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001stderr\u304c1\u3068\u3044\u3046\u540d\u524d\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u306e\u307f\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u79c1\u305f\u3061\u304c\u671b\u3093\u3067\u3044\u308b\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff01<\/p>\n<hr \/>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u4ee5\u4e0b\u306f\u3001\u3067\u304d\u308b\u3060\u3051\u308f\u304b\u308a\u3084\u3059\u304f\u8aac\u660e\u3057\u307e\u3057\u305f\u306e\u3067\u3001Linux\u3067\/dev\/null\u3092\u4f7f\u3046\u969b\u306b\u3069\u3046\u3044\u3046\u610f\u5473\u304b\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u306d\uff01\u8cea\u554f\u304c\u3042\u308c\u3070\u3001\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u3069\u3046\u305e\u3002<\/p>\n<hr \/>\n<h2>\u53c2\u8003\u6587\u732e<\/h2>\n<ul class=\"post-ul\">\n<li>StackOverflow Question<\/li>\n<\/ul>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u306b\u304a\u3051\u308b\/dev\/null\u306f\u3001\u30cc\u30eb\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002\u3053\u308c\u306b\u66f8\u304d\u8fbc\u307e\u308c\u305f\u3082\u306e\u306f\u7834\u68c4\u3055\u308c\u3001\u8aad\u307f\u53d6\u308a\u6642\u306b\u306fEOF\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002 \u3053\u308c\u306f\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30cf\u30c3\u30af\u3067\u3001\u6295\u3052\u3089\u308c\u305f\u3082\u306e\u3092\u5438\u3044\u8fbc\u3080\u6383\u9664\u6a5f\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002 \u3053\u306e [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-612","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux\u306b\u304a\u3051\u308b\/dev\/null - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Linux\u306b\u304a\u3051\u308b\/dev\/null\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, 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