How to dump the crash message of a program into files?

Question

For example if I have a python file test.py.

Running python test.py in command line crashes with message:

Segmentation Fault(core dumped)

How can I save such message into a txt file with a script? (Imagine I have test1.py, test2.py, test3.py... and they all crash. I want to collect the crash log of them all and do some analysis)

Answer 1

That message is coming from the shell, not the program. If you want to capture it, you need to run the command in a subshell so you can redirect the shell's output. You need to redirect stderr to get error messages.

for script in test*.py; do
    (python "$script")
done 2>errors.txt