I'm using the following code to get a nice prompt (including git information etc.):function set_prompt {    # magic happens in here ;)}export PROMPT_COMMAND='set_prompt'However, sometimes I get the following warning after using certain programs that make heavy use of bash internally:bash: set_prompt: command not foundOne good example for this is Gentoo's package manager emerge which shows that error when it exists. It's not a big deal - just looks ugly and doesn't break anything. But I'd like to get rid of it anyway.I assume it happens because the PROMPT_COMMAND environment variable is inherited by emerge's shells but the function isn't.Is there some way to make the PROMPT_COMMAND variable as not inheritable? Or another way to avoid this annoying issue?
How to avoid warnings from subshells if the function in PROMPT_COMMAND is not defined?
bash;environment variables
Don't export PROMPT_COMMAND to the environment. The environment is for variables that are meaningful to all programs. But PROMPT_COMMAND is only useful in bash, so leave it as a shell variable. There's no point in having it be inherited by descendant instances of bash, either: PROMPT_COMMAND is only useful in interactive instances of bash, and they all read .bashrc anyway.PROMPT_COMMAND='set_prompt'