Python执行shell命令的三种方式

.os.system方式

#!/usr/bin/env Python 
#coding:utf-8
import os

#执行成功则得到返回值0
ret=os.system('cat /TOOLS/python/test.txt')
print ret
#执行成功则得到返回值大于0
ret=os.system('cat /TOOLS/python/test1.txt')
print ret


[root@ansible python]# python ossystem.py
1111
0
cat: /TOOLS/python/test1.txt: No such file or directory
256

.os.popen方式

#!/usr/bin/env Python
#coding:utf-8
import os

#执行成功则得到命令输出
output=os.popen('cat /TOOLS/python/test.txt')
print output.readlines()


[root@ansible python]# python popen.py
['1111\n', '1111\n', '1111\n', '1111\n']

.commands方式

#!/usr/bin/env Python
#coding:utf-8
import commands

#执行成功则得到命令输出
(status, output) = commands.getstatusoutput('cat /TOOLS/python/test.txt')
print status
print output


[root@ansible python]# python command.py 
0
1111
1111
1111
1111