[Gllug] show non-zero exit code in bash

[Dean Wilson]

I have shell envy. One of my co-workers uses zsh and has a nifty feature
that shows you the exit code of any command that doesn't return a 0.

I'd like to do the same thing in bash but I've hit a stumbling block. The
following PROMPT_COMMAND does most of what I want:

PROMPT_COMMAND='ret=$?; if [ "$ret" -ne "0" ];then echo exit code: $ret;fi'

But it has a bug.

If you type ls and then press return a lot everything is fine and nothing
gets shown.

If you type "ls file_name_thats_not_real" it echos 1 as you'd expect.
But when you press return it puts the 1 out each time. I've had a fiddle
and I can't see a way around this. Any suggestions?[0]

  Dean
[0] Other than use zsh. Or don't press return after a bad command.
-- 
Dean Wilson             http://www.unixdaemon.net
Profanity is the one language all programmers understand
  --- Anon
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