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Script to start background process and then kill process


 
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# 1  
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

# 2  
1. List all process, may be with "ps ax"

2. And exclude the current grep as

Code:
 
ps ax | grep testing.scr | grep -v grep

# 3  
you could try something like:

Code:
if [ `/bin/pidof -x testing.scr | wc -l` = 1 ]
then
    do your thing
fi

That will test if there is a process for testing.scr - you could test for no process with = 0 rather than = 1

I've also done this in a script:

Code:
declare -a pids
pids=`ps aguwx | grep run.sh | awk '{print $2}' | xargs`
for thisPid in "${pids[@]:0}"
do
	printf "killing $thisPid \n"
	kill -9 $thisPid
done;

This works when I know there are multiple run.sh processes (each run.sh always has an associated child process so that's why the awk is in there), so it saves the pid's and child pids to an array, then iterates through the array and kills them. It's probably not the most elegant of solutions but it does work.
# 4  
Ok. You all have given me some ideas. Thanks.
Steve.
# 5  
You can also use pgrep(1).
 

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