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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LEARN ABOUT ULTRIX

kill

kill(1) 						      General Commands Manual							   kill(1)

Name
       kill - send a signal to a process

Syntax
       kill [-sig] processid...
       kill -l

Description
       The command sends the TERM (terminate, 15) signal to the specified processes.  If a signal name or number preceded by `-' is given as first
       argument, that signal is sent instead of terminate.  For further information, see

       The terminate signal kills processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot  be  caught.
       By convention, if process number 0 is specified, all members in the process group (that is, processes resulting from the current login) are
       signaled.  This works only if you use and not if you use To kill a process it must either belong to you or you must be superuser.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be  found  by  using	It
       allows job specifiers ``%...''  so process ID's are not as often used as arguments.  See for details.

Options
       -l   Lists  signal  names.  The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG
	    prefix.

See Also
       csh(1), ps(1), kill(2), sigvec(2)

																	   kill(1)

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