[Cialug] bash return values [was: enter passwords less]

[Chris Freeman]

On 8/20/07, Jeffrey C. Ollie <jeff at ocjtech.us> wrote:
>
>
...

> So when ssh-agent doesn't have your identity cached it still prints a
> line of text which messes up the comparison. However, by checking the
> exit code of 'ssh-add -l' I was able to get it to work:


...

I've got a trick which helps me remember to always use the exit code in my
scripts instead of relying on the output of a program. This also helps me
keep track of my current working directory and machine name, without pushing
my prompt to the right edge of the screen.

I recommend to all users who ever script in bash/ksh/sh to use a prompt like
the following:

# Prompt with the last exit vale, the word 'HOME', and the current working
directory.
# Note the single-quotes, not double-quotes or back-tics.
export PS1='[$?]-HOME->$PWD
$ ';


Clearly, you'll have up to 1/2 of your screen taken up with data you didn't
have before, but you start to really rely on that data in short order. Put
whatever data you need out there.

Chris
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