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Date: Thu, 20 Feb 2003 20:38:27 +0000
From: Julian Gilbey <[EMAIL PROTECTED]>
To: Debian bug reports <[EMAIL PROTECTED]>
Subject: libc6: /etc/init.d/devpts incorrect use of grep
Message-ID: <20030220203827.GA1019@polya>
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Package: libc6
Version: 2.3.1-11
The current /etc/init.d/devpts contains lines like:
devpts_avail=`grep -qci '[<[:space:]]devpts' /proc/filesystems || true`
But grep -qci never gives any output, it simply returns true (if a
line was found) or false (if not). So this will always set
devpts_avail to empty, which isn't very useful. Better ways of doing
this, while still always being true, would be:
devpts_avail=`grep -ci '[<[:space:]]devpts' /proc/filesystems || true`
(remove the -q option), or
devpts_avail=`grep -i '[<[:space:]]devpts' /proc/filesystems | wc -l`
(pipe to wc). The latter has the possible advantage that if
/proc/filesystems is unavailable or something like that, set -e will
kill the script.
Julian
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Date: Thu, 20 Feb 2003 17:21:05 -0500
From: Daniel Jacobowitz <[EMAIL PROTECTED]>
To: Julian Gilbey <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#181808: libc6: /etc/init.d/devpts incorrect use of grep
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On Thu, Feb 20, 2003 at 08:38:27PM +0000, Julian Gilbey wrote:
> Package: libc6
> Version: 2.3.1-11
>
> The current /etc/init.d/devpts contains lines like:
>
> devpts_avail=`grep -qci '[<[:space:]]devpts' /proc/filesystems || true`
>
> But grep -qci never gives any output, it simply returns true (if a
> line was found) or false (if not). So this will always set
> devpts_avail to empty, which isn't very useful. Better ways of doing
> this, while still always being true, would be:
>
> devpts_avail=`grep -ci '[<[:space:]]devpts' /proc/filesystems || true`
>
> (remove the -q option), or
>
> devpts_avail=`grep -i '[<[:space:]]devpts' /proc/filesystems | wc -l`
>
> (pipe to wc). The latter has the possible advantage that if
> /proc/filesystems is unavailable or something like that, set -e will
> kill the script.
Try -12 or -13. -q used to do something different.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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