{"id":103483,"date":"2024-09-02T02:32:12","date_gmt":"2024-09-01T18:32:12","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=103483"},"modified":"2024-09-02T02:32:12","modified_gmt":"2024-09-01T18:32:12","slug":"shell-script-variable","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/shell-script-variable.html","title":{"rendered":"\u8be6\u89e3\uff1aShell\u811a\u672c\u53d8\u91cf\u5224\u65ad\u53c2\u6570\u547d\u4ee4"},"content":{"rendered":"

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\u6587\u4ef6\u6216\u76ee\u5f55\u5224\u65ad<\/strong><\/span><\/div>\n
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\u6574\u6570\u5224\u65ad<\/strong><\/span><\/div>\n
\r\n-eq  \u4e24\u6570\u76f8\u7b49,\u5219\u4e3a\u771f     \u4f8b:if [ \"$a\" -eq \"$b\" ]\r\n-ne  \u4e24\u6570\u4e0d\u76f8\u7b49,\u5219\u4e3a\u771f   \u4f8b:if [ \"$a\" -ne \"$b\" ]\r\n-gt  a\u5927\u4e8eb,\u5219\u4e3a\u771f       \u4f8b:if [ \"$a\" -gt \"$b\" ]\r\n-ge  \u5927\u4e8e\u6216\u7b49\u4e8e,\u5219\u4e3a\u771f   \u4f8b:if [ \"$a\" -ge \"$b\" ]\r\n-lt  a\u5c0f\u4e8eb,\u5219\u4e3a\u771f       \u4f8b:if [ \"$a\" -lt \"$b\" ]\r\n-le  a\u5c0f\u4e8e\u6216\u7b49\u4e8eb,\u5219\u4e3a\u771f \u4f8b:if [ \"$a\" -le \"$b\" ]\r\n\r\n< \u5c0f\u4e8e(\u9700\u53cc\u62ec\u53f7)      \u4f8b:((\"$a\" < \"$b\"))\r\n<=   \u5c0f\u4e8e\u7b49\u4e8e(\u9700\u53cc\u62ec\u53f7)  \u4f8b:((\"$a\" <= \"$b\")) \r\n>    \u5927\u4e8e(\u9700\u53cc\u62ec\u53f7)      \u4f8b:((\"$a\" > \"$b\"))\r\n>=   \u5927\u4e8e\u7b49\u4e8e(\u9700\u53cc\u62ec\u53f7)  \u4f8b:((\"$a\" >= \"$b\"))\r\n\u5c0f\u6570\u636e\u6bd4\u8f83\u53ef\u4f7f\u7528AWK\u3002\r\n<\/pre>\n
\u903b\u8f91\u8fd0\u7b97\u5224\u65ad\u7b26<\/strong><\/span><\/div>\n
\r\n!  [ ! false ]              \u8fd4\u56detrue \u903b\u8f91\u5426,\u6761\u4ef6\u4e3a\u5047,\u7ed3\u679c\u4e3a\u771f\r\n-a [ $a -lt 2 -a $b -gt 5 ] \u8fd4\u56detrue \u903b\u8f91\u4e0e,\u4e24\u4e2a\u8868\u8fbe\u5f0f\u90fd\u4e3a\u771f,\u5219\u4e3a\u771f\r\n-o [ $a -lt 2 -o $b -gt 5 ] \u8fd4\u56detrue \u903b\u8f91\u6216,\u53ea\u8981\u6709\u4e00\u4e2a\u8868\u8fbe\u5f0f\u4e3atrue,\u5219\u4e3a\u771f\r\n\r\n[ ] || [ ] \u7528OR\u6765\u5408\u5e76\u4e24\u4e2a\u6761\u4ef6\r\n[ ] && [ ] \u7528AND\u6765\u5408\u5e76\u4e24\u4e2a\u6761\u4ef6\r\n<\/pre>\n
\u5b57\u7b26\u4e32\u5224\u65ad<\/strong><\/span><\/div>\n
\r\n== \u82e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u76f8\u540c\u5219\u4e3a\u771f,\u4e0e=\u7b49\u4ef7 \u4f8b:[ \"str1\" = \"str2\" ]\r\n!= \u82e5\u5b57\u7b26\u4e32\u4e0d\u76f8\u540c\u5219\u4e3a\u771f           \u4f8b:[ \"str1\" != \"str2\" ]\r\n< \u82e5str1\u5b57\u5178\u6392\u5e8f\u5728str2\u524d\u5219\u4e3a\u771f   \u4f8b:[[ \"str1\" < \"str2\" ]] >  \u82e5str1\u5b57\u5178\u6392\u5e8f\u5728str2\u540e\u5219\u4e3a\u771f   \u4f8b:[ \"str1\" \\> \"str2\" ]\r\n-n \u82e5str\u957f\u5ea6\u975e\u96f6\u5219\u4e3a\u771f,\u5373\u975e\u7a7a     \u4f8b:[ -n \"str1\" ]\r\n-z \u82e5file\u957f\u5ea6\u4e3a\u96f6,\u5373\u7a7a,\u5219\u4e3a\u771f     \u4f8b:[ -z \"str1\" ]\r\n<\/pre>\n
\u6ce8\u610f:\u5728[]\u7ed3\u6784\u4e2d\u201d< \u201c\u9700\u8981\u88ab\u8f6c\u4e49\uff0c\u4f8b\u5982:[ \"str1\" \/< \"str2\" ]\uff0c\u5728\u53cc\u4e2d\u62ec\u53f7\u4e2d\u5219\u65e0\u9700\u8f6c\u4e49\u3002\n\n\u603b\u7ed3:\u4f7f\u7528-n\u5728[]\u7ed3\u6784\u4e2d\u6d4b\u8bd5\uff0c\u5fc5\u987b\u8981\u7528\"\"\u628a\u53d8\u91cf\u5f15\u8d77\u6765\uff0c\u4f7f\u7528\u4e00\u4e2a\u672a\u88ab\"\"\u7684\u5b57\u7b26\u4e32\uff0c\u8bf7\u4f7f\u7528 ! -z \uff0c\u5982\u679c\u4f7f\u7528\u672a\u88ab\u53cc\u5f15\u53f7\u53d8\u91cf\uff0c\u867d\u7136\u53ef\u4ee5\u5de5\u4f5c\uff0c\u4f46\u8fd9\u5e76\u4e0d\u5b89\u5168\uff0c\u4e60\u60ef\u4e8e\u4f7f\u7528\u53cc\u5f15\u53f7\u62ec\u4f4f\u53d8\u91cf\u6d4b\u8bd5\u5b57\u7b26\u4e32\u662f\u4e00\u79cd\u826f\u597d\u7684\u4e60\u60ef\u3002\n\u53e6\u5916\uff0c[[ ]] \u7ed3\u6784\u6bd4[ ]\u7ed3\u6784\u66f4\u52a0\u901a\u7528\u3002\n\n\n\n\n\n
\n
\u539f\u6587\u6765\u81ea\uff1ahttps:\/\/renwole.com\/archives\/1204<\/a><\/p>\n
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