1·os.system
舉例：
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In [34]: import os
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In [35]: os.system('ls /home')
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cacti nagios oracle roottest1 roottest2 test6 test7
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Out[35]: 0
優(yōu)點：直接顯示命令的輸出和返回值
2·os.popen
舉例：
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In [36]: os.popen('ls /home')
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Out[36]: <open file 'ls /home', mode 'r' at 0xeacf60>
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In [37]: os.popen('ls /home').read()
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Out[37]: 'cacti\nnagios\noracle\nroottest1\nroottest2\ntest6\ntest7\n'
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In [38]: file_tmp = os.popen('ls /home')
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In [39]: for i in file_tmp:
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....: print i
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....:
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....:
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cacti
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nagios
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oracle
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roottest1
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roottest2
-
-
test6
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test7
優(yōu)點：可以將命令的輸出保存在變量中，然后以多種方式展示出來
3·commands.getstatusoutput
舉例：
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In [40]: import commands
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In [41]: (status, output) = commands.getstatusoutput('ls /home')
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In [42]: print status
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0
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In [43]: print output
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cacti
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nagios
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oracle
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roottest1
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roottest2
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test6
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test7
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In [44]: commands.getstatusoutput('ls /home')
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Out[44]: (0, 'cacti\nnagios\noracle\nroottest1\nroottest2\ntest6\ntest7')
優(yōu)點：命令輸出和返回值分開顯示
help資料
FUNCTIONS
getoutput(cmd)
Return output (stdout or stderr) of executing cmd in a shell.
getstatus(file)
Return output of "ls -ld <file>" in a string.
getstatusoutput(cmd)
Return (status, output) of executing cmd in a shell.
In [45]: commands.getoutput('ls /home')
Out[45]: 'cacti\nnagios\noracle\nroottest1\nroottest2\ntest6\ntest7'
In [48]: commands.getstatus('/bin/ls')
Out[48]: '-rwxr-xr-x 1 root root 91240 2010-03-01 /bin/ls'
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