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#!/usr/bin/python3

import subprocess

# Executing command without shell expansion

print("No shell expansion when shell=False", flush=True)

subprocess.call(['echo', 'Hello $USER'])

# Executing command with shell expansion

print("\nshell expansion when shell=True", flush=True)

subprocess.call('echo Hello $USER', shell=True)

# escape quotes if it is part of command

print("\nSearching for 'hello world'", flush=True)

subprocess.call('grep -i \'hello world\' hello_world.py', shell=True)