python execute shell script code example

Example 1: executing shell commands from python script

import subprocess
subprocess.run(["bash", "testShell.sh"])
#we don't have to give full path to the shell script. It always execute from the current directory

#As a rule of thumb, you need to separate the arguments based on space, 
#for example ls -alh would be ["ls", "-alh"], while ls -a -l -h, 
#would be ["ls", "-a", -"l", "-h"]. As another example, 
#echo hello world would be ["echo", "hello", "world"], 
#whereas echo "hello world" or echo hello\ world would 
#be ["echo", "hello world"].

#Another example.
list_files = subprocess.run(["ls", "-l"])
print("The exit code was: %d" % list_files.returncode)

Example 2: python run command

import os
os.system('cmd /k "Your Command Prompt Command"')

Example 3: python run a system command

import os
cmd = "git --version"
returned_value = os.system(cmd)  # returns the exit code in unix

Example 4: how to execute bash commands in python script

import subprocess
subprocess.call(["sudo", "apt", "update"])

Example 5: call shell script from python

import subprocess
subprocess.call(["./shell.sh"])

# Make sure that "shell.sh" has "+x" permissions

Example 6: python run shell command

import subprocess
process = subprocess.Popen(['echo', 'More output'],
                     stdout=subprocess.PIPE, 
                     stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
stdout, stderr