Python:模拟linux命令cat

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模拟linux的cat命令，打印从命令行输入的文件名

#!/usr/bin/python#Filename:cat.pyhelpString = '''\This program prints files to the standard output.Any number of files can be specified.Options include:--version : Prints the version number--help : Display this help'''import sysdef readfile(filename):    '''Print a file to the standard output.'''    f = file(filename)    while True:        line = f.readline()        if len(line) == 0:            break        print line,    f.close()#Script start from hereif len(sys.argv) < 2:    print 'No action specified.'    sys.exit()if sys.argv[1].startswith('--'):    option = sys.argv[1][2:]    if option == 'version' or option == 'v':        print 'Version 1.2'    elif option == 'help' or option == 'h':        print helpString    else:        print 'Unknown option.'    sys.exit()else:    for filename in sys.argv[1:]:        readfile(filename)print 'Done'

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