Date: Thu, 21 Nov 2002 10:41:13 +0100 From: Roman Neuhauser <neuhauser@bellavista.cz> To: FreeBSD Questions List <freebsd-questions@freebsd.org> Subject: Re: Bash programming; Was: connecting to SCSI drive Message-ID: <20021121094112.GR77198@freepuppy.bellavista.cz> In-Reply-To: <20021121071713.GA2641@sten.alder.net> References: <20021120180314.GA564@sten.alder.net> <20021120182423.GB30909@dan.emsphone.com> <3DDBE4A9.5060708@mac.com> <20021120204738.GA949@sten.alder.net> <20021121071713.GA2641@sten.alder.net>
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# rjhalljr@starpower.net / 2002-11-21 02:17:13 -0500:
> Following the suggestions that were posted, I now have a working
> script that checks for a connection to the DVD-RAM drive. The
> following works, but returns the 'Device not configured' error
> if there's no disk in the drive.
>
> elif !(sudo mount -t ufs -o rw /dev/cd0a $montering_punkt)
> then
>
> Currently, I'm suppressing the error message (2>/dev/null), but I'd
> rather capture sterr in a variable and replace it with a custom
> message if the error is 'Device not configured'. (The devise is
> configured, but I forgot to put a disk in the drive, so the system
> error message is confusing.) I've tried read and redirection, but I
> can't seem to capture the error message in a variable. Does
> anyone know how to do this?
tested in zsh (should work in bash):
MSG=$(sudo mount ... 2>&1)
if [ $? -ne 0 -a $MSG == "Device not configured" ]; then
echo "My custom error message"
fi
a dumbed-down version that'll work in /bin/sh (most portable):
MSG=`sudo mount /floppy 2>&1`
if [ $? -ne 0 -a "x$MSG" = "xDevice not configured" ]; then
echo "My custom error message."
fi
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