Fabian Lee : Software Engineer

Bash: forcing the process exit code using a subshell

February 24, 2022
Categories: Scripting

If the logic in your Bash script needs to force the last exit code variable “$?”, you can accomplish that with an exit inside a subprocess. For example, here is a script snippet. $(exit 99) echo “last process exit code was $?” This would return the output below. last process exit code was 99 This … Bash: forcing the process exit code using a subshell

Python: Getting live output from subprocess using poll

September 15, 2019
Categories: Python

Using subprocess.Popen, subprocess.call, or subprocess.check_output will all invoke a process using Python, but if you want live output coming from stdout you need use subprocess.Popen in tandem with the Popen.poll method. In this article I will show how to invoke a process from Python and show stdout live without waiting for the process to complete. … Python: Getting live output from subprocess using poll