{"id":326,"date":"2021-08-02T09:42:40","date_gmt":"2021-08-02T01:42:40","guid":{"rendered":"https:\/\/www.buyao007.icu\/?p=326"},"modified":"2021-08-02T09:46:32","modified_gmt":"2021-08-02T01:46:32","slug":"2-shell%e7%bc%96%e7%a8%8b%e4%b9%8b%e6%b5%81%e7%a8%8b%e6%8e%a7%e5%88%b6%e5%88%a4%e6%96%ad","status":"publish","type":"post","link":"https:\/\/www.buyao007.icu\/?p=326","title":{"rendered":"2.shell\u7f16\u7a0b\u4e4b\u6d41\u7a0b\u63a7\u5236\u5224\u65ad"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6\u7fa4\u67b6\u6784\u4e0e\u81ea\u52a8\u5316\u8fd0\u7ef4\uff0c\u66fe\u8d1f\u8d23\u56fd\u5185\u67d0\u5927\u578b\u535a\u5ba2\u7f51\u7ad9\u8fd0\u7ef4\u5de5\u4f5c\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" style=\"font-size:30px\">\u4e00\u3001shell\u5224\u65ad-if<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.if\u5224\u65ad\u57fa\u672c\u6982\u8ff0<\/h2>\n\n\n\n<p class=\"has-medium-font-size\"><strong>1.\u4ec0\u4e48\u662fif\uff1f<\/strong><br>If\u5c31\u662f\u6a21\u4eff\u4eba\u7c7b\u7684\u5224\u65ad\u6765\u8fdb\u884c\u7684\uff0c\u4f46\u4ed6\u6ca1\u6709\u4eba\u7c7b\u90a3\u4e48\u6709\u60c5\u611f\uff0c\u53ea\u6709True\u548cfalse\u8fd9\u4e24\u79cd\u7ed3\u679c\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>2.\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528if<\/strong><br>\u5f53\u6211\u4eec\u5728\u5199\u7a0b\u5e8f\u7684\u65f6\u5019\uff0c\u662f\u5426\u7ecf\u5e38\u9700\u8981\u5bf9\u4e0a\u4e00\u6b65\u6267\u884c\u7ed3\u679c\u8fdb\u884c\u5224\u65ad\u3002\u90a3\u4e48\u5224\u65ad\u5c31\u9700\u8981\u7528if\u8bed\u53e5\u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>3.if\u7684\u57fa\u7840\u8bed\u6cd5<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>1.\u5355\u5206\u652f\u8bed\u6cd5\nif &#91; $1 -eq $2];then\necho \u201cok\u201d\nfi\n2.\u53cc\u5206\u652f\u7ed3\u6784\nif &#91; $1 -eq $2 ];then\necho \u201cok\u201d\nelse\necho \u201cerror\u201d\nfi\n3.\u591a\u5206\u652f\u7ed3\u6784###\u5982\u679c\u4e0a\u9762\u7684\u5339\u914d\u6210\u529f\u5c31\u4e0d\u4f1a\u7ee7\u7eed\u5411\u4e0b\u5339\u914d\nif &#91; \u5982\u679c\u4f60\u6709\u623f ]\uff1bthen\n  \u6211\u5c31\u5ac1\u7ed9\u4f60\nelif &#91; \u4f60\u6709\u8f66 ]\uff1bthen\n\u6211\u5c31\u5ac1\u7ed9\u4f60\nelif &#91; \u4f60\u6709\u94b1 ]\uff1bthen\n \u6211\u5c31\u5ac1\u7ed9\u4f60\nelse\n \u518d\u89c1\nfi<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.if\u57fa\u4e8e\u6587\u4ef6\u6bd4\u8f83<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u53c2\u6570<\/td><td>\u8bf4\u660e<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>-e<\/td><td>\u6587\u4ef6\u6216\u76ee\u5f55\u5b58\u5728\u5219\u4e3a\u771f<\/td><td>[ -e file ]<\/td><\/tr><tr><td>-d<\/td><td>\u76ee\u5f55\u5b58\u5728\u5219\u4e3a\u771f<\/td><td>[ -d file ]<\/td><\/tr><tr><td>-f<\/td><td>\u6587\u4ef6\u5b58\u5728\u5219\u4e3a\u771f<\/td><td>[ -f file ]<\/td><\/tr><tr><td>-s<\/td><td>\u6587\u4ef6\u5b58\u5728\u4e14\u81f3\u5c11\u6709\u4e00\u4e2a\u5b57\u7b26\u5219\u4e3a\u771f<\/td><td>[ -s file ]<\/td><\/tr><tr><td>-w<\/td><td>\u6587\u4ef6\u5b58\u5728\u4e14\u53ef\u5199\u5219\u4e3a\u771f<\/td><td>[ -w file ]<\/td><\/tr><tr><td>-x<\/td><td>\u6587\u4ef6\u5b58\u5728\u4e14\u53ef\u6267\u884c\u5219\u4e3a\u771f<\/td><td>[ -x file ]<\/td><\/tr><tr><td>-r<\/td><td>\u6587\u4ef6\u5b58\u5728\u4e14\u53ef\u8bfb\u5219\u4e3a\u771f<\/td><td>[ -r file ]<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>\u793a\u4f8b\n&#91;root@fsf \/server\/script]# cat tes.sh \n#!\/bin\/bash\nif &#91;&#91; -d $1 &amp;&amp; -f $2 ]];then\necho \u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728\nfi\n&#91;root@fsf \/server\/script]# sh tes.sh \/etc\/ \/etc\/hosts\n\u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.if\u57fa\u4e8e\u6574\u6570\u6bd4\u8f83<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u53c2\u6570<\/td><td>\u8bf4\u660e<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>-eq<\/td><td>\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -eq 10 ]<\/td><\/tr><tr><td>-ne<\/td><td>\u4e0d\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -ne 10 ]<\/td><\/tr><tr><td>-gt<\/td><td>\u5927\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -gt 10 ]<\/td><\/tr><tr><td>-lt<\/td><td>\u5c0f\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -lt 10 ]<\/td><\/tr><tr><td>-ge<\/td><td>\u5927\u4e8e\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -ge 10 ]<\/td><\/tr><tr><td>-le<\/td><td>\u5c0f\u4e8e\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ 1 -le 10 ]<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>\u5728\u6b63\u5219\u4e2d\u6574\u6570\u6bd4\u8f83\u4f7f\u7528\u4ee5\u4e0b\u7b26\u53f7    &#91;&#91;  ]]\u8868\u793a\u652f\u6301\u6b63\u5219\n==\n!=\n&gt;\n&lt;\n&gt;=\n&lt;=<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4.if\u57fa\u4e8e\u5b57\u7b26\u4e32\u6bd4\u8f83<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u53c2\u6570<\/td><td>\u8bf4\u660e<\/td><td>\u793a\u4f8b<\/td><\/tr><tr><td>==<\/td><td>\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ \u201c$a\u201d == \u201c$b\u201d]<\/td><\/tr><tr><td>!=<\/td><td>\u4e0d\u7b49\u4e8e\u5219\u6761\u4ef6\u4e3a\u771f<\/td><td>[ \u201c$a\u201d \uff01= \u201c$b\u201d]<\/td><\/tr><tr><td>-z<\/td><td>\u5b57\u7b26\u4e32\u4e3a\u7a7a\u5219\u4e3a\u771f<\/td><td>[ -z \u201c$b\u201d]<\/td><\/tr><tr><td>-n<\/td><td>\u5b57\u7b26\u4e32\u4e0d\u4e3a\u7a7a\u5219\u4e3a\u771f<\/td><td>[ -n = \u201c$b\u201d]<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">5.fi\u57fa\u4e8e\u6b63\u5219\u6bd4\u8f83<\/h2>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>\n#\u5355\u4e2d\u62ec\u53f7\u65e0\u6cd5\u4f7f\u7528\u6b63\u5219\u8bed\u6cd5\n#\u53cc\u4e2d\u62ec\u53f7\u624d\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\n&#91;&#91; $user =~ ^r ]]###\u53d8\u91cf\u4ee5r\u5f00\u5934\u5219\u4e3a\u771f\n&#91;&#91; $user =~ &#91;0-9] ]] ###\u53d8\u91cf\u5b58\u5728\u6570\u5b57\u5219\u4e3a\u771f\n&#91;&#91; $user =~ &#91;0-9]{1,} ]] ###\u53d8\u91cf\u5b58\u5728\u6570\u5b57\u4e14\u81f3\u5c11\u51fa\u73b0\u4e00\u6b21\u5219\u4e3a\u771f\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">6.if\u7684\u4e0e\u6216\u975e<\/h2>\n\n\n\n<p>#\u4e00\u4e2a\u4e2d\u62ec\u53f7\u4f7f\u7528[]<\/p>\n\n\n\n<p>-o \u6216\u8005<\/p>\n\n\n\n<p class=\"has-medium-font-size\">-a \u5e76\u4e14<\/p>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>\u4ee5\u4e0b\u5199\u6cd5\u4e0d\u6b63\u786e\n&#91;root@fsf \/server\/script]# cat tes.sh \n#!\/bin\/bash\nif &#91;&#91; $1 -eq 0 -o $2 -eq 1 ]];then\necho \u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728\nfi\n&#91;root@fsf \/server\/script]# sh tes.sh 0 1\ntes.sh: line 2: syntax error in conditional expression\ntes.sh: line 2: syntax error near `-o'\ntes.sh: line 2: `if &#91;&#91; $1 -eq 0 -o $2 -eq 1 ]];then'\n\u4ee5\u4e0b\u5199\u6cd5\u624d\u6b63\u786e\n&#91;root@fsf \/server\/script]# vim tes.sh\n#!\/bin\/bash\nif &#91; $1 -eq 0 -o $2 -eq 1 ];then\necho \u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728\nfi\n&#91;root@fsf \/server\/script]# sh tes.sh 0 1\n\u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">\u4e24\u4e2a\u4e2d\u62ec\u53f7\u4f7f\u7528[[]]<br>|| \u6216\u8005<br>$$ \u5e76\u4e14<\/p>\n\n\n\n<pre class=\"wp-block-code has-medium-font-size\"><code>\n###\u4ee5\u4e0b\u5199\u6cd5\u4e0d\u6b63\u786e\n&#91;root@fsf \/server\/script]# cat tes.sh \n#!\/bin\/bash\nif &#91; $1 -eq 0 &amp;&amp;  $2 -eq 1 ];then\necho \u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728\nfi\n&#91;root@fsf \/server\/script]# sh tes.sh 0 1\ntes.sh: line 2: &#91;: missing `]'\n####\u4ee5\u4e0b\u5199\u6cd5\u624d\u6b63\u786e\n&#91;root@fsf \/server\/script]# cat tes.sh \n#!\/bin\/bash\nif &#91;&#91; $1 -eq 0 &amp;&amp;  $2 -eq 1 ]];then\necho \u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728\nfi\n&#91;root@fsf \/server\/script]# sh tes.sh 0 1\n\u6587\u4ef6\u548c\u76ee\u5f55\u5b58\u5728<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\" style=\"font-size:30px\">\u4e8c\u3001shell\u5224\u65ad-case<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.case\u57fa\u672c\u6982\u8ff0<\/h2>\n\n\n\n<p class=\"has-medium-font-size\">1\uff0e\u4ec0\u4e48\u662fcase<br>case\u8bed\u53e5\u548cif\u591a\u5206\u652f\u5224\u65ad\u8bed\u53e5\u7c7b\u4f3c\uff0c\u4e3b\u8981\u7528\u6765\u505a\u591a\u6761\u4ef6\u5224\u65ad\uff0c\u53ea\u4e0d\u8fc7case\u6bd4if\u591a\u5206\u652f\u6761\u4ef6\u5224\u65ad\u66f4\u65b9\u4fbf\u3002<br>2.case\u4f7f\u7528\u573a\u666f<br>\u5728\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u4f1a\u6839\u636e\u4e00\u4e2a\u95ee\u9898\u505a\u591a\u79cd\u9884\u6848\uff0c\u7136\u540e\u6839\u636e\u7528\u6237\u9009\u62e9\u6765\u52a0\u8f7d\u4e0d\u540c\u7684\u9884\u6848\u3002<br>\u6bd4\u5982\u670d\u52a1\u7684\u542f\u505c\u811a\u672c\uff0c\u6211\u4eec\u9996\u5148\u8981\u5199\u597d\u542f\u52a8\u3001\u505c\u6b62\u3001\u91cd\u542f\u7684\u9884\u6848\uff0c\u7136\u540e\u6839\u636e\u7528\u6237\u9009\u62e9\u4f20\u9012\u7684\u53c2\u6570\u6765\u52a0\u8f7d\u4e0d\u540c\u7684\u9884\u6848\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">3.case\u7684\u57fa\u7840\u8bed\u6cd5<br>case \u53d8\u91cf in<br>\u6761\u4ef6 1 \uff09<br>\u6267\u884c\u4ee3\u7801\u57571<br>\uff1b\uff1b<br>\u6761\u4ef6 2 \uff09<br>\u6267\u884c\u4ee3\u7801\u57572<br>\uff1b\uff1b<br>\u6761\u4ef6 3 \uff09<br>\u6267\u884c\u4ee3\u7801\u57573<br>\uff1b\uff1b<br>* \uff09<br>\u5176\u4ed6\u6761\u4ef6<br>esac<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"_links":{"self":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/326"}],"collection":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=326"}],"version-history":[{"count":2,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/326\/revisions"}],"predecessor-version":[{"id":328,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/326\/revisions\/328"}],"wp:attachment":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}