{"id":122,"date":"2019-02-10T18:04:07","date_gmt":"2019-02-10T10:04:07","guid":{"rendered":"http:\/\/b.yesiyu.top\/?p=122"},"modified":"2019-02-10T18:04:07","modified_gmt":"2019-02-10T10:04:07","slug":"shell-%e5%9f%ba%e6%9c%ac%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/b.yesiyu.top\/?p=122","title":{"rendered":"Shell \u57fa\u672c\u8fd0\u7b97\u7b26"},"content":{"rendered":"<h1>Shell \u57fa\u672c\u8fd0\u7b97\u7b26<\/h1>\n<p>Shell \u548c\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e00\u6837\uff0c\u652f\u6301\u591a\u79cd\u8fd0\u7b97\u7b26\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7b97\u6570\u8fd0\u7b97\u7b26<\/li>\n<li>\u5173\u7cfb\u8fd0\u7b97\u7b26<\/li>\n<li>\u5e03\u5c14\u8fd0\u7b97\u7b26<\/li>\n<li>\u5b57\u7b26\u4e32\u8fd0\u7b97\u7b26<\/li>\n<li>\u6587\u4ef6\u6d4b\u8bd5\u8fd0\u7b97\u7b26<\/li>\n<\/ul>\n<p>\u539f\u751fbash\u4e0d\u652f\u6301\u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u547d\u4ee4\u6765\u5b9e\u73b0\uff0c\u4f8b\u5982 awk \u548c expr\uff0cexpr \u6700\u5e38\u7528\u3002<\/p>\n<p>expr \u662f\u4e00\u6b3e\u8868\u8fbe\u5f0f\u8ba1\u7b97\u5de5\u5177\uff0c\u4f7f\u7528\u5b83\u80fd\u5b8c\u6210\u8868\u8fbe\u5f0f\u7684\u6c42\u503c\u64cd\u4f5c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e24\u4e2a\u6570\u76f8\u52a0(<strong>\u6ce8\u610f\u4f7f\u7528\u7684\u662f\u53cd\u5f15\u53f7 ` \u800c\u4e0d\u662f\u5355\u5f15\u53f7 &#8216;<\/strong>)\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"com\">#!\/bin\/bash<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr 2 + 2`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"\u4e24\u6570\u4e4b\u548c\u4e3a : $val\"<\/span><\/pre>\n<p><a class=\"showbtn\" href=\"http:\/\/www.runoob.com\/try\/runcode.php?filename=add2data&amp;type=bash\" target=\"_blank\" rel=\"noopener\">\u8fd0\u884c\u5b9e\u4f8b \u00bb<\/a><\/p>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pun\">\u4e24\u6570\u4e4b\u548c\u4e3a<\/span> <span class=\"pun\">:<\/span> <span class=\"lit\">4<\/span><\/pre>\n<p>\u4e24\u70b9\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u8868\u8fbe\u5f0f\u548c\u8fd0\u7b97\u7b26\u4e4b\u95f4\u8981\u6709\u7a7a\u683c\uff0c\u4f8b\u5982 2+2 \u662f\u4e0d\u5bf9\u7684\uff0c\u5fc5\u987b\u5199\u6210 2 + 2\uff0c\u8fd9\u4e0e\u6211\u4eec\u719f\u6089\u7684\u5927\u591a\u6570\u7f16\u7a0b\u8bed\u8a00\u4e0d\u4e00\u6837\u3002<\/li>\n<li>\u5b8c\u6574\u7684\u8868\u8fbe\u5f0f\u8981\u88ab\u00a0<span class=\"marked\">` `<\/span>\u00a0\u5305\u542b\uff0c\u6ce8\u610f\u8fd9\u4e2a\u5b57\u7b26\u4e0d\u662f\u5e38\u7528\u7684\u5355\u5f15\u53f7\uff0c\u5728 Esc \u952e\u4e0b\u8fb9\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>\u7b97\u672f\u8fd0\u7b97\u7b26<\/h2>\n<p>\u4e0b\u8868\u5217\u51fa\u4e86\u5e38\u7528\u7684\u7b97\u672f\u8fd0\u7b97\u7b26\uff0c\u5047\u5b9a\u53d8\u91cf a \u4e3a 10\uff0c\u53d8\u91cf b \u4e3a 20\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u8fd0\u7b97\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>+<\/td>\n<td>\u52a0\u6cd5<\/td>\n<td>`expr $a + $b` \u7ed3\u679c\u4e3a\u00a030\u3002<\/td>\n<\/tr>\n<tr>\n<td>&#8211;<\/td>\n<td>\u51cf\u6cd5<\/td>\n<td>`expr $a &#8211; $b` \u7ed3\u679c\u4e3a -10\u3002<\/td>\n<\/tr>\n<tr>\n<td>*<\/td>\n<td>\u4e58\u6cd5<\/td>\n<td>`expr $a \\* $b` \u7ed3\u679c\u4e3a \u00a0200\u3002<\/td>\n<\/tr>\n<tr>\n<td>\/<\/td>\n<td>\u9664\u6cd5<\/td>\n<td>`expr $b \/ $a` \u7ed3\u679c\u4e3a\u00a02\u3002<\/td>\n<\/tr>\n<tr>\n<td>%<\/td>\n<td>\u53d6\u4f59<\/td>\n<td>`expr $b % $a` \u7ed3\u679c\u4e3a\u00a00\u3002<\/td>\n<\/tr>\n<tr>\n<td>=<\/td>\n<td>\u8d4b\u503c<\/td>\n<td>a=$b \u5c06\u628a\u53d8\u91cf b \u7684\u503c\u8d4b\u7ed9 a\u3002<\/td>\n<\/tr>\n<tr>\n<td>==<\/td>\n<td>\u76f8\u7b49\u3002\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6570\u5b57\uff0c\u76f8\u540c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a == $b ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>!=<\/td>\n<td>\u4e0d\u76f8\u7b49\u3002\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6570\u5b57\uff0c\u4e0d\u76f8\u540c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a != $b ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>\u6ce8\u610f\uff1a<\/b>\u6761\u4ef6\u8868\u8fbe\u5f0f\u8981\u653e\u5728\u65b9\u62ec\u53f7\u4e4b\u95f4\uff0c\u5e76\u4e14\u8981\u6709\u7a7a\u683c\uff0c\u4f8b\u5982:\u00a0<b>[$a==$b]<\/b>\u00a0\u662f\u9519\u8bef\u7684\uff0c\u5fc5\u987b\u5199\u6210\u00a0<b>[ $a == $b ]<\/b>\u3002<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u7b97\u672f\u8fd0\u7b97\u7b26\u5b9e\u4f8b\u5982\u4e0b\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\na<\/span><span class=\"pun\">=<\/span><span class=\"lit\">10<\/span><span class=\"pln\">\r\nb<\/span><span class=\"pun\">=<\/span><span class=\"lit\">20<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr $a + $b`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"a + b : $val\"<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr $a - $b`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"a - b : $val\"<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr $a \\* $b`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"a * b : $val\"<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr $b \/ $a`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"b \/ a : $val\"<\/span><span class=\"pln\">\r\n\r\nval<\/span><span class=\"pun\">=<\/span><span class=\"str\">`expr $b % $a`<\/span><span class=\"pln\">\r\necho <\/span><span class=\"str\">\"b % a : $val\"<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">==<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">!=<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">a <\/span><span class=\"pun\">+<\/span><span class=\"pln\"> b <\/span><span class=\"pun\">:<\/span> <span class=\"lit\">30<\/span><span class=\"pln\">\r\na <\/span><span class=\"pun\">-<\/span><span class=\"pln\"> b <\/span><span class=\"pun\">:<\/span> <span class=\"pun\">-<\/span><span class=\"lit\">10<\/span><span class=\"pln\">\r\na <\/span><span class=\"pun\">*<\/span><span class=\"pln\"> b <\/span><span class=\"pun\">:<\/span> <span class=\"lit\">200<\/span><span class=\"pln\">\r\nb <\/span><span class=\"pun\">\/<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">:<\/span> <span class=\"lit\">2<\/span><span class=\"pln\">\r\nb <\/span><span class=\"pun\">%<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">:<\/span> <span class=\"lit\">0<\/span><span class=\"pln\">\r\na <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b<\/span><\/pre>\n<blockquote><p><b>\u6ce8\u610f\uff1a<\/b><\/p>\n<ul>\n<li>\u4e58\u53f7(*)\u524d\u8fb9\u5fc5\u987b\u52a0\u53cd\u659c\u6760(\\)\u624d\u80fd\u5b9e\u73b0\u4e58\u6cd5\u8fd0\u7b97\uff1b<\/li>\n<li>if&#8230;then&#8230;fi \u662f\u6761\u4ef6\u8bed\u53e5\uff0c\u540e\u7eed\u5c06\u4f1a\u8bb2\u89e3\u3002<\/li>\n<li>\u5728 MAC \u4e2d shell \u7684 expr \u8bed\u6cd5\u662f\uff1a<strong>$((\u8868\u8fbe\u5f0f))<\/strong>\uff0c\u6b64\u5904\u8868\u8fbe\u5f0f\u4e2d\u7684 &#8220;*&#8221; \u4e0d\u9700\u8981\u8f6c\u4e49\u7b26\u53f7 &#8220;\\&#8221; \u3002<\/li>\n<\/ul>\n<\/blockquote>\n<hr \/>\n<h2>\u5173\u7cfb\u8fd0\u7b97\u7b26<\/h2>\n<p>\u5173\u7cfb\u8fd0\u7b97\u7b26\u53ea\u652f\u6301\u6570\u5b57\uff0c\u4e0d\u652f\u6301\u5b57\u7b26\u4e32\uff0c\u9664\u975e\u5b57\u7b26\u4e32\u7684\u503c\u662f\u6570\u5b57\u3002<\/p>\n<p>\u4e0b\u8868\u5217\u51fa\u4e86\u5e38\u7528\u7684\u5173\u7cfb\u8fd0\u7b97\u7b26\uff0c\u5047\u5b9a\u53d8\u91cf a \u4e3a 10\uff0c\u53d8\u91cf b \u4e3a 20\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u8fd0\u7b97\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>-eq<\/td>\n<td>\u68c0\u6d4b\u4e24\u4e2a\u6570\u662f\u5426\u76f8\u7b49\uff0c\u76f8\u7b49\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -eq $b ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-ne<\/td>\n<td>\u68c0\u6d4b\u4e24\u4e2a\u6570\u662f\u5426\u4e0d\u76f8\u7b49\uff0c\u4e0d\u76f8\u7b49\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -ne $b ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-gt<\/td>\n<td>\u68c0\u6d4b\u5de6\u8fb9\u7684\u6570\u662f\u5426\u5927\u4e8e\u53f3\u8fb9\u7684\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -gt $b ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-lt<\/td>\n<td>\u68c0\u6d4b\u5de6\u8fb9\u7684\u6570\u662f\u5426\u5c0f\u4e8e\u53f3\u8fb9\u7684\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -lt $b ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-ge<\/td>\n<td>\u68c0\u6d4b\u5de6\u8fb9\u7684\u6570\u662f\u5426\u5927\u4e8e\u7b49\u4e8e\u53f3\u8fb9\u7684\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -ge $b ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-le<\/td>\n<td>\u68c0\u6d4b\u5de6\u8fb9\u7684\u6570\u662f\u5426\u5c0f\u4e8e\u7b49\u4e8e\u53f3\u8fb9\u7684\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -le $b ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u5173\u7cfb\u8fd0\u7b97\u7b26\u5b9e\u4f8b\u5982\u4e0b\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\na<\/span><span class=\"pun\">=<\/span><span class=\"lit\">10<\/span><span class=\"pln\">\r\nb<\/span><span class=\"pun\">=<\/span><span class=\"lit\">20<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">eq $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -eq $b : a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -eq $b: a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">ne $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -ne $b: a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -ne $b : a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -gt $b: a \u5927\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -gt $b: a \u4e0d\u5927\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -lt $b: a \u5c0f\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -lt $b: a \u4e0d\u5c0f\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">ge $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -ge $b: a \u5927\u4e8e\u6216\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -ge $b: a \u5c0f\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">le $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -le $b: a \u5c0f\u4e8e\u6216\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a -le $b: a \u5927\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">eq <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">ne <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u5927\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u5c0f\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">ge <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u5c0f\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">le <\/span><span class=\"lit\">20<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u5c0f\u4e8e\u6216\u7b49\u4e8e<\/span><span class=\"pln\"> b<\/span><\/pre>\n<hr \/>\n<h2>\u5e03\u5c14\u8fd0\u7b97\u7b26<\/h2>\n<p>\u4e0b\u8868\u5217\u51fa\u4e86\u5e38\u7528\u7684\u5e03\u5c14\u8fd0\u7b97\u7b26\uff0c\u5047\u5b9a\u53d8\u91cf a \u4e3a 10\uff0c\u53d8\u91cf b \u4e3a 20\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u8fd0\u7b97\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>!<\/td>\n<td>\u975e\u8fd0\u7b97\uff0c\u8868\u8fbe\u5f0f\u4e3a true \u5219\u8fd4\u56de false\uff0c\u5426\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ ! false ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-o<\/td>\n<td>\u6216\u8fd0\u7b97\uff0c\u6709\u4e00\u4e2a\u8868\u8fbe\u5f0f\u4e3a true \u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -lt 20 -o $b -gt 100 ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-a<\/td>\n<td>\u4e0e\u8fd0\u7b97\uff0c\u4e24\u4e2a\u8868\u8fbe\u5f0f\u90fd\u4e3a true \u624d\u8fd4\u56de true\u3002<\/td>\n<td>[ $a -lt 20 -a $b -gt 100 ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u5e03\u5c14\u8fd0\u7b97\u7b26\u5b9e\u4f8b\u5982\u4e0b\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\na<\/span><span class=\"pun\">=<\/span><span class=\"lit\">10<\/span><span class=\"pln\">\r\nb<\/span><span class=\"pun\">=<\/span><span class=\"lit\">20<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">!=<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a != $b : a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a != $b: a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">a $b <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">15<\/span> <span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 100 \u4e14 $b \u5927\u4e8e 15 : \u8fd4\u56de true\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 100 \u4e14 $b \u5927\u4e8e 15 : \u8fd4\u56de false\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">o $b <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 100 \u6216 $b \u5927\u4e8e 100 : \u8fd4\u56de true\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 100 \u6216 $b \u5927\u4e8e 100 : \u8fd4\u56de false\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">5<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">o $b <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 5 \u6216 $b \u5927\u4e8e 100 : \u8fd4\u56de true\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a \u5c0f\u4e8e 5 \u6216 $b \u5927\u4e8e 100 : \u8fd4\u56de false\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"lit\">10<\/span> <span class=\"pun\">!=<\/span> <span class=\"lit\">20<\/span> <span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"lit\">10<\/span> <span class=\"pun\">\u5c0f\u4e8e<\/span> <span class=\"lit\">100<\/span> <span class=\"pun\">\u4e14<\/span> <span class=\"lit\">20<\/span> <span class=\"pun\">\u5927\u4e8e<\/span> <span class=\"lit\">15<\/span> <span class=\"pun\">:<\/span> <span class=\"pun\">\u8fd4\u56de<\/span> <span class=\"kwd\">true<\/span>\r\n<span class=\"lit\">10<\/span> <span class=\"pun\">\u5c0f\u4e8e<\/span> <span class=\"lit\">100<\/span> <span class=\"pun\">\u6216<\/span> <span class=\"lit\">20<\/span> <span class=\"pun\">\u5927\u4e8e<\/span> <span class=\"lit\">100<\/span> <span class=\"pun\">:<\/span> <span class=\"pun\">\u8fd4\u56de<\/span> <span class=\"kwd\">true<\/span>\r\n<span class=\"lit\">10<\/span> <span class=\"pun\">\u5c0f\u4e8e<\/span> <span class=\"lit\">5<\/span> <span class=\"pun\">\u6216<\/span> <span class=\"lit\">20<\/span> <span class=\"pun\">\u5927\u4e8e<\/span> <span class=\"lit\">100<\/span> <span class=\"pun\">:<\/span> <span class=\"pun\">\u8fd4\u56de<\/span> <span class=\"kwd\">false<\/span><\/pre>\n<hr \/>\n<h2>\u903b\u8f91\u8fd0\u7b97\u7b26<\/h2>\n<p>\u4ee5\u4e0b\u4ecb\u7ecd Shell \u7684\u903b\u8f91\u8fd0\u7b97\u7b26\uff0c\u5047\u5b9a\u53d8\u91cf a \u4e3a 10\uff0c\u53d8\u91cf b \u4e3a 20:<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u8fd0\u7b97\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>&amp;&amp;<\/td>\n<td>\u903b\u8f91\u7684 AND<\/td>\n<td>[[ $a -lt 100 &amp;&amp; $b -gt 100 ]] \u8fd4\u56de false<\/td>\n<\/tr>\n<tr>\n<td>||<\/td>\n<td>\u903b\u8f91\u7684 OR<\/td>\n<td>[[ $a -lt 100 || $b -gt 100 ]] \u8fd4\u56de true<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u903b\u8f91\u8fd0\u7b97\u7b26\u5b9e\u4f8b\u5982\u4e0b\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\na<\/span><span class=\"pun\">=<\/span><span class=\"lit\">10<\/span><span class=\"pln\">\r\nb<\/span><span class=\"pun\">=<\/span><span class=\"lit\">20<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">&amp;&amp;<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">]]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u8fd4\u56de true\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u8fd4\u56de false\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">lt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">||<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">-<\/span><span class=\"pln\">gt <\/span><span class=\"lit\">100<\/span> <span class=\"pun\">]]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u8fd4\u56de true\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u8fd4\u56de false\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pun\">\u8fd4\u56de<\/span> <span class=\"kwd\">false<\/span>\r\n<span class=\"pun\">\u8fd4\u56de<\/span> <span class=\"kwd\">true<\/span><\/pre>\n<hr \/>\n<h2>\u5b57\u7b26\u4e32\u8fd0\u7b97\u7b26<\/h2>\n<p>\u4e0b\u8868\u5217\u51fa\u4e86\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u8fd0\u7b97\u7b26\uff0c\u5047\u5b9a\u53d8\u91cf a \u4e3a &#8220;abc&#8221;\uff0c\u53d8\u91cf b \u4e3a &#8220;efg&#8221;\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u8fd0\u7b97\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>=<\/td>\n<td>\u68c0\u6d4b\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\uff0c\u76f8\u7b49\u8fd4\u56de true\u3002<\/td>\n<td>[ $a = $b ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>!=<\/td>\n<td>\u68c0\u6d4b\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\uff0c\u4e0d\u76f8\u7b49\u8fd4\u56de true\u3002<\/td>\n<td>[ $a != $b ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-z<\/td>\n<td>\u68c0\u6d4b\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u5426\u4e3a0\uff0c\u4e3a0\u8fd4\u56de true\u3002<\/td>\n<td>[ -z $a ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-n<\/td>\n<td>\u68c0\u6d4b\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u5426\u4e3a0\uff0c\u4e0d\u4e3a0\u8fd4\u56de true\u3002<\/td>\n<td>[ -n &#8220;$a&#8221; ] \u8fd4\u56de true\u3002<\/td>\n<\/tr>\n<tr>\n<td>$<\/td>\n<td>\u68c0\u6d4b\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff0c\u4e0d\u4e3a\u7a7a\u8fd4\u56de true\u3002<\/td>\n<td>[ $a ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u5b57\u7b26\u4e32\u8fd0\u7b97\u7b26\u5b9e\u4f8b\u5982\u4e0b\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\na<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"abc\"<\/span><span class=\"pln\">\r\nb<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"efg\"<\/span>\r\n\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">=<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a = $b : a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a = $b: a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">!=<\/span><span class=\"pln\"> $b <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a != $b : a \u4e0d\u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a != $b: a \u7b49\u4e8e b\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">z $a <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"-z $a : \u5b57\u7b26\u4e32\u957f\u5ea6\u4e3a 0\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"-z $a : \u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u4e3a 0\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">n <\/span><span class=\"str\">\"$a\"<\/span> <span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"-n $a : \u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u4e3a 0\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"-n $a : \u5b57\u7b26\u4e32\u957f\u5ea6\u4e3a 0\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span><span class=\"pln\"> $a <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a : \u5b57\u7b26\u4e32\u4e0d\u4e3a\u7a7a\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"$a : \u5b57\u7b26\u4e32\u4e3a\u7a7a\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pln\">abc <\/span><span class=\"pun\">=<\/span><span class=\"pln\"> efg<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b\r\nabc <\/span><span class=\"pun\">!=<\/span><span class=\"pln\"> efg <\/span><span class=\"pun\">:<\/span><span class=\"pln\"> a <\/span><span class=\"pun\">\u4e0d\u7b49\u4e8e<\/span><span class=\"pln\"> b\r\n<\/span><span class=\"pun\">-<\/span><span class=\"pln\">z abc <\/span><span class=\"pun\">:<\/span> <span class=\"pun\">\u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u4e3a<\/span> <span class=\"lit\">0<\/span>\r\n<span class=\"pun\">-<\/span><span class=\"pln\">n abc <\/span><span class=\"pun\">:<\/span> <span class=\"pun\">\u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u4e3a<\/span> <span class=\"lit\">0<\/span><span class=\"pln\">\r\nabc <\/span><span class=\"pun\">:<\/span> <span class=\"pun\">\u5b57\u7b26\u4e32\u4e0d\u4e3a\u7a7a<\/span><\/pre>\n<hr \/>\n<h2>\u6587\u4ef6\u6d4b\u8bd5\u8fd0\u7b97\u7b26<\/h2>\n<p>\u6587\u4ef6\u6d4b\u8bd5\u8fd0\u7b97\u7b26\u7528\u4e8e\u68c0\u6d4b Unix \u6587\u4ef6\u7684\u5404\u79cd\u5c5e\u6027\u3002<\/p>\n<p>\u5c5e\u6027\u68c0\u6d4b\u63cf\u8ff0\u5982\u4e0b\uff1a<\/p>\n<table class=\"reference\">\n<tbody>\n<tr>\n<th>\u64cd\u4f5c\u7b26<\/th>\n<th>\u8bf4\u660e<\/th>\n<th>\u4e3e\u4f8b<\/th>\n<\/tr>\n<tr>\n<td>-b file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u662f\u5757\u8bbe\u5907\u6587\u4ef6\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -b $file ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-c file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u662f\u5b57\u7b26\u8bbe\u5907\u6587\u4ef6\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -c $file ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-d file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u662f\u76ee\u5f55\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -d $file ] \u8fd4\u56de false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-f file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u662f\u666e\u901a\u6587\u4ef6\uff08\u65e2\u4e0d\u662f\u76ee\u5f55\uff0c\u4e5f\u4e0d\u662f\u8bbe\u5907\u6587\u4ef6\uff09\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -f $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-g file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u8bbe\u7f6e\u4e86 SGID \u4f4d\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -g $file ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-k file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u8bbe\u7f6e\u4e86\u7c98\u7740\u4f4d(Sticky Bit)\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -k $file ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-p file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u662f\u6709\u540d\u7ba1\u9053\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -p $file ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-u file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u8bbe\u7f6e\u4e86 SUID \u4f4d\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -u $file ] \u8fd4\u56de\u00a0false\u3002<\/td>\n<\/tr>\n<tr>\n<td>-r file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u53ef\u8bfb\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -r $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-w file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u53ef\u5199\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -w $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-x file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u53ef\u6267\u884c\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -x $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-s file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\u662f\u5426\u4e3a\u7a7a\uff08\u6587\u4ef6\u5927\u5c0f\u662f\u5426\u5927\u4e8e0\uff09\uff0c\u4e0d\u4e3a\u7a7a\u8fd4\u56de true\u3002<\/td>\n<td>[ -s $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<tr>\n<td>-e file<\/td>\n<td>\u68c0\u6d4b\u6587\u4ef6\uff08\u5305\u62ec\u76ee\u5f55\uff09\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\u3002<\/td>\n<td>[ -e $file ] \u8fd4\u56de\u00a0true\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u4f8b<\/h3>\n<p>\u53d8\u91cf file \u8868\u793a\u6587\u4ef6&#8221;\/var\/www\/runoob\/test.sh&#8221;\uff0c\u5b83\u7684\u5927\u5c0f\u4e3a100\u5b57\u8282\uff0c\u5177\u6709 rwx \u6743\u9650\u3002\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u5c06\u68c0\u6d4b\u8be5\u6587\u4ef6\u7684\u5404\u79cd\u5c5e\u6027\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\nfile<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"\/var\/www\/runoob\/test.sh\"<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">r $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u53ef\u8bfb\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u53ef\u8bfb\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">w $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u53ef\u5199\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u53ef\u5199\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">x $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u53ef\u6267\u884c\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u53ef\u6267\u884c\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">f $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e3a\u666e\u901a\u6587\u4ef6\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e3a\u7279\u6b8a\u6587\u4ef6\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">d $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u662f\u4e2a\u76ee\u5f55\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u662f\u4e2a\u76ee\u5f55\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">s $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u4e3a\u7a7a\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e3a\u7a7a\"<\/span>\r\n<span class=\"kwd\">fi<\/span>\r\n<span class=\"kwd\">if<\/span> <span class=\"pun\">[<\/span> <span class=\"pun\">-<\/span><span class=\"pln\">e $file <\/span><span class=\"pun\">]<\/span>\r\n<span class=\"kwd\">then<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u5b58\u5728\"<\/span>\r\n<span class=\"kwd\">else<\/span><span class=\"pln\">\r\n   echo <\/span><span class=\"str\">\"\u6587\u4ef6\u4e0d\u5b58\u5728\"<\/span>\r\n<span class=\"kwd\">fi<\/span><\/pre>\n<p>\u6267\u884c\u811a\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"prettyprint prettyprinted\"><span class=\"pun\">\u6587\u4ef6\u53ef\u8bfb<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u53ef\u5199<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u53ef\u6267\u884c<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u4e3a\u666e\u901a\u6587\u4ef6<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u4e0d\u662f\u4e2a\u76ee\u5f55<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u4e0d\u4e3a\u7a7a<\/span>\r\n<span class=\"pun\">\u6587\u4ef6\u5b58\u5728<\/span><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Shell \u57fa\u672c\u8fd0\u7b97\u7b26 Shell \u548c\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e00\u6837\uff0c\u652f\u6301\u591a\u79cd\u8fd0\u7b97\u7b26\uff0c\u5305\u62ec\uff1a \u7b97\u6570\u8fd0\u7b97\u7b26 \u5173\u7cfb\u8fd0\u7b97\u7b26 \u5e03\u5c14\u8fd0 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/b.yesiyu.top\/?p=122\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cShell \u57fa\u672c\u8fd0\u7b97\u7b26\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-122","post","type-post","status-publish","format-standard","hentry","category-liunx-"],"_links":{"self":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/122","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=122"}],"version-history":[{"count":1,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/122\/revisions"}],"predecessor-version":[{"id":123,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=\/wp\/v2\/posts\/122\/revisions\/123"}],"wp:attachment":[{"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/b.yesiyu.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}