用python执行Linux命令

例1：在python中包装ls命令

#!/usr/bin/env python
#python wapper for the ls command
import subprocess
subprocess.call(["ls","-l"])

在Linux中执行该命令

[root@pydb python]# python ls.py
total 8
-rwxrwxrwx 1 root root 415 Mar 18 11:40 a.py
-rw-r--r-- 1 root root 103 May 4      22:17 ls.py

下面扩展一下

[root@pydb python]# python ls.py
#!/usr/bin/env python
#python wapper for the ls command
import subprocess
subprocess.call(["cat","/python/ls.py"])
以上是执行Linux下的命令和参数。非常不错的一个例子，好好记住吧

下面一个例子是打印系统信息和磁盘信息的：

#!/usr/bin/env python
#A System Information Gathering Script
import subprocess
#command 1
uname = "uname"
uname_arg = "-a"
print "Gathering system information with %s command:
" % uname
subprocess.call([uname,uname_arg])
#command 2
diskspace = "df"
diskspace_arg = "-h"
print "Gathering diskspace information %s command:
" % diskspace
subprocess.call([diskspace,diskspace_arg])

下面是我本地执行打印的数据

[root@pydb python]# python info.py
Gathering system information with uname command:
Linux pydb 2.6.18-308.el5 #1 SMP Tue Feb 21 20:05:41 EST 2012 i686 i686 i386 GNU /Linux
Gathering diskspace information df command:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       37G 3.9G 31G 11% /
/dev/sda1 99M 13M 82M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
[root@pydb python]#