Detailed introduction to subprocess module

os.system(): Output the result to the screen and return the status of the output command. A result of 0 means the output is correct

os.popen() saves the output results

import subprocess #This module is to replace some old modules, such as os. system, etc., usually better to use under linux

subprocess.call()

The above example shows that if there is no pipeline involved, it can be completed directly in the form of a list, otherwise the shell=True parameter must be added

subprocess.check_call():#Check the return status

subprocess.getstatusoutput()#Return status and result

Three states of subprocess. stdout,stdin,stderr

>>>res=subprocess.Popen("ifconfig|grep192",shell=True,stdout=subprocess.PIPE,stderr=subprocess. PIPE,stdin=subprocess.PIPE)

>>> res.stdout.read()

'inet addr:192.168.1.210 Bcast:192.168.1.255 Mask:255.255.255.0 \n'

For the above command, to read the result, you have to use the res.stdout.read() format

You can also read the error

res.poll () can return the status, 0 means the command is executed correctly

res.terminate() can kill the res process

In the following sentence, you can add cwd : used to set the current directory of the subprocess, env is used to set the environment of the subprocessVariables

echo 'hello'",shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE,stdin=subprocess.PIPE,cwd=”/tmp”)

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