其中用到了subprocess模块

>>> import subprocess

>>> p = subprocess.Popen('df -h',stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True)

#获取命令执行结果的返回码,通过wait()函数

>>> p.wait()

0

#获取命令输出结果(标准输出),通过read()方法

>>> p.stdout.read()

'Filesystem Size Used Avail Use% Mounted on /dev/sda1 18G 11G 5.8G 65% / tmpfs 495M 0 495M 0% /dev/shm '

#获取命令错误输出结果，通过read()方法

>>> p.stderr.read()

''

#为空，说明没有错误输出

#获取错误输出

<subprocess.Popen object at 0x7f267528dbd0>

>>> p = subprocess.Popen('ls /etc/password',stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True,close_fds=True)

>>> p.stderr.read()

'ls: cannot access /etc/password: No such file or directory '

@获取错误输出的其他方法还有:read(),readline()，readlines(),close(),write()和writelines()等.

#!/usr/bin/env python

#_*_ coding:utf8 _*_

# by lijiajun

import re,subprocess,os,sys

net_region='192.168.3'

print("#########################################################")

print("#此脚本主要基于ping，测试某网段已用ip和未使用的ip #")

print("#分别将其保存到/tmp/alive_ip.txt #")

print("#以及/tmp/dead_ip.txt #")

print("#########################################################")

print(" ")

if os.path.isfile("/tmp/alive_ip.txt"):

os.popen("mv /tmp/alive_ip.txt /tmp/alive_ip.txt.old")

print "you can see the used ip in this file : /tmp/alive_ip.txt"

if os.path.isfile("/tmp/dead_ip.txt"):

os.popen("mv /tmp/dead_ip.txt /tmp/dead_ip.txt.old")

print "you can see the unused ip in this file : /tmp/dead_ip.txt"

print(" ")

dead_ip=0

alive_ip=0

def check_alive(ip,count,timeout):

global alive_ip

global dead_ip

cmd='ping -c %d -w %d %s' % (count,timeout,ip)

p=subprocess.Popen(cmd,

stdin=subprocess.PIPE,

stdout=subprocess.PIPE,

stderr=subprocess.PIPE,

shell=True)

result=p.stdout.read()

regx=re.findall('100% packet loss',result)

if len(regx)==0:

print("33[1;32;40m %s is UP 33[0m") % (ip)

f=file('/tmp/alive_ip.txt','a')

f.write('%s ' %ip)

f.close()

alive_ip=alive_ip+1

print "alive_ip count is %d" % alive_ip

return alive_ip

else:

print "33[31m %s is DOWN33[0m" % (ip)

f=file('/tmp/dead_ip.txt','a')

f.write('%s ' %ip)

f.close()

dead_ip=dead_ip+1

print "dead_ip count is %d" % dead_ip

return dead_ip

if name=="main":

#f=file('/tmp/iplist.txt')

for i in range(1,255):

ip='%s.%s' % (net_region,i)

print ip

check_alive(ip,1,1)

print (" ")

print "final dead_ip count is %d" % dead_ip

print "final alived_ip count is %d" % alive_ip