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Date: Sun, 2 Jun 2013 22:05:31 -0700
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Subject: Re: while {some command does not exit = 1)
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh-Users List <zsh-users@zsh.org>
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On Sun, Jun 2, 2013 at 9:24 PM, TJ Luoma <luomat@gmail.com> wrote:

> Here's what I have been doing:
>
> #!/bin/zsh -f
>
> EXIT=1
>
> while [ "$EXIT" = "1" ]
> do
>
>         drutil discinfo | fgrep -q 'Please insert a disc to get disc info.'
>
>         EXIT="$?"
>
>         FOO
>
> done
>

It should work to just write

while ! drutil discinfo | fgrep -q 'Please insert a disc to get disc info.'
do
    FOO
done

Except that the $? value of the pipeline is going to be the exit status of
fgrep, not of drutil.  I suspect that's what you meant, so FOO runs only
when a disc is present.  You can make this clearer by writing it as

while ! { drutil discinfo | fgrep -q 'Please insert a disc to get disc
info.' }
do
    FOO
done

Spaces around the "!" are important, especially if you're in a shell with
history enabled.

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