Hi below is my code for bash shell script, in this I want to capture error message for if clause, when it says either job is already running or unable to start the job to a variable, how it is possible in below script, or any other way for the below functionality
if initctl start $i ; then
echo "service $i started by script"
else
echo "not able to start service $i"
fi
You can for example use the syntax msg=$(command 2>&1 1>/dev/null) to redirect stderr to stdout after redirecting stdout to /dev/null. This way, it will just store stderr:
error=$(initctl start $i 2>&1 1>/dev/null)
if [ $? -eq 0 ]; then
echo "service $i started by script"
else
echo "service $i could not be started. Error: $error"
fi
This uses How to pipe stderr, and not stdout?, so that it catches stderr from initctl start $i and stores in $error variable.
Then, $? contains the return code of the command, as seen in How to check if a command succeeded?. If 0, it succeeded; otherwise, some errors happened.
cron and it returned the correct error when cron was already running. It does need sudo to run though, otherwise it returns an Unknown job: xxx error
stdout if successful, he could do out=$(initctl start $i 2>&1) and use for both.Use '$?' variable It stores any exit_code from the previous statement See http://www.tldp.org/LDP/abs/html/exitcodes.html for more information
initctl start $i
retval=$?
if [ $retval -eq 0 ]; then
echo "service $i started by script"
else
echo "not able to start service $i"
fi
