Script to start background process and then kill process Post: 302428073

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Top Forums UNIX for Dummies Questions & Answers Script to start background process and then kill process Post 302428073 by holocene on Tuesday 8th of June 2010 06:38:54 PM

06-08-2010

Registered User

Script to start background process and then kill process

What I need to learn is how to use a script that launches background processes, and then kills those processes as needed.

The script successfully launches the script. But how do I check to see if the job exists before I kill it?

I know my problem is mostly failure to understand parameter expansion and conditionals.

Best Regards
Steve.

Code:

#!/bin/bash

operation="go"
while [ "$operation" != "quit" ]; do
    echo -n 'Enter Operation '
    read operation    

    case $operation in
        "start testing" )
##Start a process
            echo "starting testing"
            ./testing.scr &
                    ;;
        "stop testing" )
##Stop a process

#check to see if process exists. kill if exists, warn if it does not
            if [ "$(ps | grep testing.scr)" -ne "" ]; then
            kill $(ps | grep testing.scr | cut -d' ' -f 2)
                else
                    echo "job does not exist"
            fi            
                    ;;                    
                    
        * )
            echo "error keyed"
        ;;
    esac
done

holocene

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killall

killall(1M)															       killall(1M)

NAME

       killall - kill all active processes

SYNOPSIS

       [signal]

DESCRIPTION

       is a procedure used by to kill all active processes not directly related to the shutdown procedure.

       is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted.  sends
       the specified signal to all user processes in the system, with the following exceptions:

	      the process;

	      all processes (including background processes) associated with the terminal from which was invoked;

	      any process, if owned by

	      any process, if owned by

	      any process;

	      any process;

	      any process.

       obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).

       If no signal is specified, a default of (kill) is used.

       is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).

FILES

SEE ALSO

       fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).

STANDARDS CONFORMANCE

																       killall(1M)

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