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Full Discussion: Error output of cat to /dev/null
Top Forums Shell Programming and Scripting Error output of cat to /dev/null Post 302493900 by Nils88 on Friday 4th of February 2011 06:03:49 AM
Old 02-04-2011
Error output of cat to /dev/null
Hello,

I'm trying to send the error output of a 'cat' operation to /dev/null like this:

Code:
cat /dirA/dirB/temp*.log  > /dirA/dirB/final.log 2>/dev/null

This works perfectly in a terminal, but not when placed in a script.

If there are no files matching temp*.log the script outputs an error saying: /dirA/dirB/final.log: No such file or directory.

The same problem occurs on the next line in the script where I want to remove all temp*.log files
Code:
rm /dirA/dirB/temp*.log 2>/dev/null


Sending all errors of the script to /dev/null is not an option as I need error information from other parts of the script.

Anybody an idea as to how to solve this
 

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LEARN ABOUT DEBIAN

cmannotifyd

cmannotifyd(8)						     CMAN Notification Daemon						    cmannotifyd(8)

NAME

       cmannotifyd - CMAN Notification Daemon

SYNOPSIS

       cmannotifyd [-f] [-d]

DESCRIPTION

       The cmannotifyd daemon talks to CMAN and provides a mechanism to notify external entities about cluster changes.

       CMAN dispatches 3 kind of notifications:

       - CMAN_REASON_TRY_SHUTDOWN when cman requests to all clients if it is allowed to shutdown.

       - CMAN_REASON_STATECHANGE when cman detects a node joining or leaving the cluster.

       - CMAN_REASON_CONFIG_UPDATE when a configuration change event has been detected/requested.

       These notifications are then dispatched to the shell script cman_notify in the environment variable CMAN_NOTIFICATION.

       cman_notify will then execute all the scripts in the configured notification directory (default: /etc/cluster/cman-notify.d) passing a very
       minimal set of envvars including, of course, the CMAN_NOTIFICATION= type.  The execution order is set by the filename as shown by "LC_ALL=C
       ls -las".

       cmannotifyd logs are stored in the default log file (/var/log/cluster/cmannotifyd.log).

       cman_notify  logs are stored in the default log file (/var/log/cluster/cman_notify.log). By default the output from the scripts executed by
       cman_notify is redirected to /dev/null.	Users can either set CMAN_NOTIFICATION_DEBUG=1 in their environment or set proper debug configura-
       tion in cluster.conf to redirect scripts output to the cman_notify log file.

NOTES

       cmannotifyd does not block on cman_notify nor check the exit status of the script.

       Notifications are dispatched in the same order as they arrive, one by one.

       CMAN_REASON_TRY_SHUTDOWN  is  passed  to  scripts  for information only, they can not influence cman's decsion about whether or not to shut
       down.

       CMAN_REASON_STATECHANGE also implies CMAN_NOTIFICATION_QUORUM exported in the environment. CMAN_NOTIFICATION_QUORUM will be set to 1  (when
       the node is part of a quorate cluster) or 0 (otherwise).

       A template for cman_notify scripts can be found in the doc/ directory.

OPTIONS

       -f     Run in the foreground (do not fork / daemonize).

       -d     Enable debug output.

								   November 2008						    cmannotifyd(8)
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