FWIW Haiku uses bash and has a prompt which changes colour (green/red)
depending on whether the status code of the last command was good or
bad. I found this surprisingly useful. They use:
\[`if [ $? = 0 ]; then echo "\e[32m"; else echo "\e[31m"; fi`\]\w[\e[0m\]>
Warning: This is intrusive because reading the status code via "$?" resets it
to zero:
$ false
$ echo $?
1
$ echo $?
0
$
So a follow-on script cannot tell whether the command just before
the color-changing prompt succeeded or failed.
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