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Shell Programming and Scripting
[BASH] redirect standard error and use it inside
Post 302171763 by Pescator on Friday 29th of February 2008 11:54:26 AM
02-29-2008
[BASH] redirect standard error and use it inside
Hi all,
Maybe my question is too simple but till now i couldn't figure about a solution
I have a bash script scheduled in cron:
<cron time parameters> my_script.sh > result.log 2>&1
By this way i can have standard output and standard error in my result.log file
Now i want my script to alert me when some critical errors occurs.
For example, if i want to do a check like that:
ls $dir
if [ $? -ne 0 ]
then
echo "ALERT ALERT ALERT" >>fileAlert.log
fi
But as i redirected the stderror i can't catch it enymore with $?, isn't it?
When i launch the script, by commmand line:
my_script.sh > results.log 2>&1
i get the error:
"Ambiguous output redirect"
I can do something about that? Or maybe i miss something else?
For sure i can use AWK and similiar to parse output of each test in the script, but i would like to use the exit status of each command.
Is it possible??
thanks in advance!
Maybe my question is too simple but till now i couldn't figure about a solution
I have a bash script scheduled in cron:
<cron time parameters> my_script.sh > result.log 2>&1
By this way i can have standard output and standard error in my result.log file
Now i want my script to alert me when some critical errors occurs.
For example, if i want to do a check like that:
ls $dir
if [ $? -ne 0 ]
then
echo "ALERT ALERT ALERT" >>fileAlert.log
fi
But as i redirected the stderror i can't catch it enymore with $?, isn't it?
When i launch the script, by commmand line:
my_script.sh > results.log 2>&1
i get the error:
"Ambiguous output redirect"
I can do something about that? Or maybe i miss something else?
For sure i can use AWK and similiar to parse output of each test in the script, but i would like to use the exit status of each command.
Is it possible??
thanks in advance!
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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)