{"id":1485,"date":"2016-11-27T08:35:09","date_gmt":"2016-11-27T00:35:09","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=1485"},"modified":"2016-11-27T08:35:09","modified_gmt":"2016-11-27T00:35:09","slug":"shell-%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/shell-%e5%8f%98%e9%87%8f\/","title":{"rendered":"Shell \u53d8\u91cf"},"content":{"rendered":"
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Shell \u53d8\u91cf<\/h1>\n

\u5b9a\u4e49\u53d8\u91cf\u65f6\uff0c\u53d8\u91cf\u540d\u4e0d\u52a0\u7f8e\u5143\u7b26\u53f7\uff08$\uff0cPHP\u8bed\u8a00\u4e2d\u53d8\u91cf\u9700\u8981\uff09\uff0c\u5982\uff1a<\/p>\n

your_name<\/span>=<\/span>\"runoob.com\"<\/span><\/pre>\n
\u6ce8\u610f\uff0c\u53d8\u91cf\u540d\u548c\u7b49\u53f7\u4e4b\u95f4\u4e0d\u80fd\u6709\u7a7a\u683c\uff0c\u8fd9\u53ef\u80fd\u548c\u4f60\u719f\u6089\u7684\u6240\u6709\u7f16\u7a0b\u8bed\u8a00\u90fd\u4e0d\u4e00\u6837\u3002\u540c\u65f6\uff0c\u53d8\u91cf\u540d\u7684\u547d\u540d\u987b\u9075\u5faa\u5982\u4e0b\u89c4\u5219\uff1a<\/p>\n
    \n
  • \u9996\u4e2a\u5b57\u7b26\u5fc5\u987b\u4e3a\u5b57\u6bcd\uff08a-z\uff0cA-Z\uff09\u3002<\/li>\n
  • \u4e2d\u95f4\u4e0d\u80fd\u6709\u7a7a\u683c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u5212\u7ebf\uff08_\uff09\u3002<\/li>\n
  • \u4e0d\u80fd\u4f7f\u7528\u6807\u70b9\u7b26\u53f7\u3002<\/li>\n
  • \u4e0d\u80fd\u4f7f\u7528bash\u91cc\u7684\u5173\u952e\u5b57\uff08\u53ef\u7528help\u547d\u4ee4\u67e5\u770b\u4fdd\u7559\u5173\u952e\u5b57\uff09\u3002<\/li>\n<\/ul>\n
    \u9664\u4e86\u663e\u5f0f\u5730\u76f4\u63a5\u8d4b\u503c\uff0c\u8fd8\u53ef\u4ee5\u7528\u8bed\u53e5\u7ed9\u53d8\u91cf\u8d4b\u503c\uff0c\u5982\uff1a<\/p>\n
    for<\/span> file <\/span>in<\/span> `ls \/etc`<\/span><\/pre>\n
    \u4ee5\u4e0a\u8bed\u53e5\u5c06 \/etc \u4e0b\u76ee\u5f55\u7684\u6587\u4ef6\u540d\u5faa\u73af\u51fa\u6765\u3002<\/p>\n
    \n
    \u4f7f\u7528\u53d8\u91cf<\/h3>\n
    \u4f7f\u7528\u4e00\u4e2a\u5b9a\u4e49\u8fc7\u7684\u53d8\u91cf\uff0c\u53ea\u8981\u5728\u53d8\u91cf\u540d\u524d\u9762\u52a0\u7f8e\u5143\u7b26\u53f7\u5373\u53ef\uff0c\u5982\uff1a<\/p>\n
    your_name<\/span>=<\/span>\"qinjx\"<\/span>\r\necho $your_name\r\necho $<\/span>{<\/span>your_name<\/span>}<\/span><\/pre>\n
    \u53d8\u91cf\u540d\u5916\u9762\u7684\u82b1\u62ec\u53f7\u662f\u53ef\u9009\u7684\uff0c\u52a0\u4e0d\u52a0\u90fd\u884c\uff0c\u52a0\u82b1\u62ec\u53f7\u662f\u4e3a\u4e86\u5e2e\u52a9\u89e3\u91ca\u5668\u8bc6\u522b\u53d8\u91cf\u7684\u8fb9\u754c\uff0c\u6bd4\u5982\u4e0b\u9762\u8fd9\u79cd\u60c5\u51b5\uff1a<\/p>\n
    for<\/span> skill <\/span>in<\/span> Ada<\/span> Coffe<\/span> Action<\/span> Java<\/span>;<\/span> do<\/span>\r\n    echo <\/span>\"I am good at ${skill}Script\"<\/span>\r\ndone<\/span><\/pre>\n
    \u5982\u679c\u4e0d\u7ed9skill\u53d8\u91cf\u52a0\u82b1\u62ec\u53f7\uff0c\u5199\u6210echo “I am good at $skillScript”\uff0c\u89e3\u91ca\u5668\u5c31\u4f1a\u628a$skillScript\u5f53\u6210\u4e00\u4e2a\u53d8\u91cf\uff08\u5176\u503c\u4e3a\u7a7a\uff09\uff0c\u4ee3\u7801\u6267\u884c\u7ed3\u679c\u5c31\u4e0d\u662f\u6211\u4eec\u671f\u671b\u7684\u6837\u5b50\u4e86\u3002<\/p>\n
    \u63a8\u8350\u7ed9\u6240\u6709\u53d8\u91cf\u52a0\u4e0a\u82b1\u62ec\u53f7\uff0c\u8fd9\u662f\u4e2a\u597d\u7684\u7f16\u7a0b\u4e60\u60ef\u3002<\/p>\n
    \u5df2\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u88ab\u91cd\u65b0\u5b9a\u4e49\uff0c\u5982\uff1a<\/p>\n
    your_name<\/span>=<\/span>\"tom\"<\/span>\r\necho $your_name\r\nyour_name<\/span>=<\/span>\"alibaba\"<\/span>\r\necho $your_name<\/span><\/pre>\n
    \u8fd9\u6837\u5199\u662f\u5408\u6cd5\u7684\uff0c\u4f46\u6ce8\u610f\uff0c\u7b2c\u4e8c\u6b21\u8d4b\u503c\u7684\u65f6\u5019\u4e0d\u80fd\u5199$your_name=”alibaba”\uff0c\u4f7f\u7528\u53d8\u91cf\u7684\u65f6\u5019\u624d\u52a0\u7f8e\u5143\u7b26\uff08$\uff09\u3002<\/p>\n
    \u53ea\u8bfb\u53d8\u91cf<\/h3>\n
    \u4f7f\u7528 readonly \u547d\u4ee4\u53ef\u4ee5\u5c06\u53d8\u91cf\u5b9a\u4e49\u4e3a\u53ea\u8bfb\u53d8\u91cf\uff0c\u53ea\u8bfb\u53d8\u91cf\u7684\u503c\u4e0d\u80fd\u88ab\u6539\u53d8\u3002<\/p>\n
    \u4e0b\u9762\u7684\u4f8b\u5b50\u5c1d\u8bd5\u66f4\u6539\u53ea\u8bfb\u53d8\u91cf\uff0c\u7ed3\u679c\u62a5\u9519\uff1a<\/p>\n
    #!\/bin\/bash<\/span>\r\nmyUrl<\/span>=<\/span>\"https:\/\/www.w3cschool.cc\"<\/span>\r\nreadonly<\/span> myUrl\r\nmyUrl<\/span>=<\/span>\"https:\/\/www.runoob.com\"<\/span><\/pre>\n
    \u8fd0\u884c\u811a\u672c\uff0c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
    \/bin\/<\/span>sh<\/span>:<\/span> NAME<\/span>:<\/span> This<\/span> variable <\/span>is<\/span> read only<\/span>.<\/span><\/pre>\n
    \u5220\u9664\u53d8\u91cf<\/h3>\n
    \u4f7f\u7528 unset \u547d\u4ee4\u53ef\u4ee5\u5220\u9664\u53d8\u91cf\u3002\u8bed\u6cd5\uff1a<\/p>\n
    unset variable_name<\/span><\/pre>\n
    \u53d8\u91cf\u88ab\u5220\u9664\u540e\u4e0d\u80fd\u518d\u6b21\u4f7f\u7528\u3002unset \u547d\u4ee4\u4e0d\u80fd\u5220\u9664\u53ea\u8bfb\u53d8\u91cf\u3002<\/p>\n
    \u5b9e\u4f8b<\/b><\/p>\n
    #!\/bin\/sh<\/span>\r\nmyUrl<\/span>=<\/span>\"https:\/\/www.runoob.com\"<\/span>\r\nunset myUrl\r\necho $myUrl<\/span><\/pre>\n
    \u4ee5\u4e0a\u5b9e\u4f8b\u6267\u884c\u5c06\u6ca1\u6709\u4efb\u4f55\u8f93\u51fa\u3002<\/p>\n
    \u53d8\u91cf\u7c7b\u578b<\/h3>\n
    \u8fd0\u884cshell\u65f6\uff0c\u4f1a\u540c\u65f6\u5b58\u5728\u4e09\u79cd\u53d8\u91cf\uff1a<\/p>\n
      \n
    • 1) \u5c40\u90e8\u53d8\u91cf<\/strong> \u5c40\u90e8\u53d8\u91cf\u5728\u811a\u672c\u6216\u547d\u4ee4\u4e2d\u5b9a\u4e49\uff0c\u4ec5\u5728\u5f53\u524dshell\u5b9e\u4f8b\u4e2d\u6709\u6548\uff0c\u5176\u4ed6shell\u542f\u52a8\u7684\u7a0b\u5e8f\u4e0d\u80fd\u8bbf\u95ee\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n
    • 2) \u73af\u5883\u53d8\u91cf<\/strong> \u6240\u6709\u7684\u7a0b\u5e8f\uff0c\u5305\u62ecshell\u542f\u52a8\u7684\u7a0b\u5e8f\uff0c\u90fd\u80fd\u8bbf\u95ee\u73af\u5883\u53d8\u91cf\uff0c\u6709\u4e9b\u7a0b\u5e8f\u9700\u8981\u73af\u5883\u53d8\u91cf\u6765\u4fdd\u8bc1\u5176\u6b63\u5e38\u8fd0\u884c\u3002\u5fc5\u8981\u7684\u65f6\u5019shell\u811a\u672c\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u73af\u5883\u53d8\u91cf\u3002<\/li>\n
    • 3) shell\u53d8\u91cf<\/strong> shell\u53d8\u91cf\u662f\u7531shell\u7a0b\u5e8f\u8bbe\u7f6e\u7684\u7279\u6b8a\u53d8\u91cf\u3002shell\u53d8\u91cf\u4e2d\u6709\u4e00\u90e8\u5206\u662f\u73af\u5883\u53d8\u91cf\uff0c\u6709\u4e00\u90e8\u5206\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u8fd9\u4e9b\u53d8\u91cf\u4fdd\u8bc1\u4e86shell\u7684\u6b63\u5e38\u8fd0\u884c<\/li>\n<\/ul>\n
      \n
      Shell \u5b57\u7b26\u4e32<\/h2>\n
      \u5b57\u7b26\u4e32\u662fshell\u7f16\u7a0b\u4e2d\u6700\u5e38\u7528\u6700\u6709\u7528\u7684\u6570\u636e\u7c7b\u578b\uff08\u9664\u4e86\u6570\u5b57\u548c\u5b57\u7b26\u4e32\uff0c\u4e5f\u6ca1\u5565\u5176\u5b83\u7c7b\u578b\u597d\u7528\u4e86\uff09\uff0c\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u5355\u5f15\u53f7\uff0c\u4e5f\u53ef\u4ee5\u7528\u53cc\u5f15\u53f7\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u7528\u5f15\u53f7\u3002\u5355\u53cc\u5f15\u53f7\u7684\u533a\u522b\u8ddfPHP\u7c7b\u4f3c\u3002<\/p>\n
      \u5355\u5f15\u53f7<\/h3>\n
      str<\/span>=<\/span>'this is a string'<\/span><\/pre>\n
      \u5355\u5f15\u53f7\u5b57\u7b26\u4e32\u7684\u9650\u5236\uff1a<\/p>\n