How to get kill command result in bash script

Question

I have a bash script which run a command to get its result and do something depends on the result. Here is the script:

#!/bin/bash
commandResult=$(($myCommand) 2>&1)
if [[ "$commandResult" == *Error* ]]; then 
    x="failed"
else
    x="success"
fi
echo $x
exit 0;

There is no problem with this script, the issue is when I try to kill $myCommand in the middle of running the script via kill -9 $myCommand in command line, the $commandResult will be null and the "success" will be printed.

How could I put the kill result in the $commandResult or any other way to find out if process killed in this script?

Any help would be much appreciated.

chepner · Accepted Answer · 2013-05-20 15:14:43Z

3

You should be checking your command's exit code, not its output to standard error. myCommand should exit with 0 on success, and some non-zero code on failure. If it is killed via the kill command, it's exit code will automatically be 128+n, where n is the signal you used to kill it. Then you can test for success with

if myCommand; then
    echo success
    exit 0
else
    status=$?
    echo failure
    exit $status
fi

Also, you probably don't need to use kill -9. Start with kill (which sends the gentler TERM signal); if that doesn't work, step up to kill -2 (INT, equivalent of Ctrl-C).

edited May 20, 2013 at 15:14

answered May 20, 2013 at 15:06

chepner

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