sys-\u7cfb\u7edf\u7279\u5b9a\u7684\u53c2\u6570\u548c\u529f\u80fd<\/strong><\/span><\/div>\n
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\r\n#!\/usr\/bin\/python\r\n# Filename: cat.py\r\n \r\nimport sys\r\n \r\ndef readfile(filename):\r\n '''Print a file to the standard output.'''\r\n f = file(filename)\r\n while True:\r\n line = f.readline()\r\n if len(line) == 0:\r\n break\r\n print line, # notice comma\r\n f.close()\r\n \r\n# Script starts from here\r\nif len(sys.argv) < 2:\r\n print 'No action specified.'\r\n sys.exit()\r\n \r\nif sys.argv[1].startswith('--'):\r\n option = sys.argv[1][2:]\r\n # fetch sys.argv[1] but without the first two characters\r\n if option == 'version':\r\n print 'Version 1.2'\r\n elif option == 'help':\r\n print '''\\\r\nThis program prints files to the standard output.\r\nAny number of files can be specified.\r\nOptions include:\r\n --version : Prints the version number\r\n --help : Display this help'''\r\n else:\r\n print 'Unknown option.'\r\n sys.exit()\r\nelse:\r\n for filename in sys.argv[1:]:\r\n readfile(filename)<\/pre>\n
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\u5728python\u7a0b\u5e8f\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u5373\u4e0d\u662f\u5728\u4ea4\u4e92\u6a21\u5f0f\u4e0b\uff0c\u5728sys.argv[]\u5217\u8868\u4e2d\u603b\u662f\u81f3\u5c11\u6709\u4e00\u4e2a\u9879\u76ee\uff0c\u5b83\u5c31\u662f\u5f53\u524d\u8fd0\u884c\u7684\u7a0b\u5e8f\u7684\u540d\u79f0\uff0c\u5176\u4ed6\u7684\u547d\u4ee4\u884c\u53c2\u6570\u5728\u8fd9\u4e2a\u9879\u76ee\u4e4b\u540e\u3002<\/p>\n
\u53e6\u5916\uff0csys\u6a21\u5757\u4e2d\u8fd8\u6709\u5176\u4ed6\u7279\u522b\u6709\u7528\u7684\u9879\u76ee\uff0csys.stdin sys.stdout sys.stderr\u5206\u522b\u5bf9\u5e94\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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