How Can I Safely Pipe Processes in Python's `subprocess` Without Using `shell=True`?

Piping with subprocess

Piping with subprocess involves using the shell parameter to spawn the process with a shell that supports piping the output. However, due to security concerns, it's not recommended to use shell=True.

Alternative Piping Solution

To pipe processes without relying on shell=True, create separate processes for each command and connect their input and output streams. For instance:

ps = subprocess.Popen(('ps', '-A'), stdout=subprocess.PIPE)
output = subprocess.check_output(('grep', 'process_name'), stdin=ps.stdout)

Here, ps represents the process running ps -A and grep is the process running grep 'process_name'.

Simplified Approach for Your Case

In your specific scenario, instead of using pipes, you can simply call subprocess.check_output(('ps', '-A')) and then apply str.find on the returned output to check for the desired process.

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