Re: more distinct default bash prompt?

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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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