I've set my PROMPT_COMMAND in my .bash_profile using the command `export PROMPT_COMMAND="echo hello"`. It works just fine in a login shell, but when I start a subshell by running the `bash` command, it seems like PROMPT_COMMAND is empty. I tried setting another variable, TEST, in the same way, and it shows up perfectly in the subshell. What might be causing the difference here? Is there a specific way bash handles PROMPT_COMMAND differently?
4 Answers
It sounds like you might have something else in your environment that's interfering with your settings. Instead of setting PROMPT_COMMAND in .bash_profile, try adding it to .bashrc without the export. It's more like a shell variable like PS1, and it doesn't need to be in the environment. That might solve your issue!
You could troubleshoot this by running `exec bash -x`, which will start a new interactive bash session and trace all commands being executed. Look through the output for any mentions of PROMPT_COMMAND to see what's going on.
Have you checked your .bashrc file? It might have its own setting for PROMPT_COMMAND that's overriding yours in .bash_profile.
Just a heads-up, PROMPT_COMMAND is actually treated as an array in bash. Exporting arrays can be tricky since they usually don’t persist. That's likely why your exported PROMPT_COMMAND isn’t working as expected in the subshell.
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