Controling jobs on UNIX systems

Posted on February 6th, 2010 in Oracle on Linux Commands to control your jobs on UNIX systems, UNIX commands, UNIX job monitoring

UNIX job monitoring and control facilities allows you to monitor the jobs executed on background and bring the jobs on foreground . Here I like to described different command used to control your jobs on background as well as foreground.

Commands to control your jobs on UNIX systems

jobs - This command check the status of the jobs in the current session. It shows the jobs executing on background also.

ps –u – This command check the status of processes including those from other sessions.

kill -9 %1 - kill a job ( 1 is job number, preceding % sign) by job number

kill -9 PID – kill a process by PID (Process ID ) number

bg – Run the most recently stopped job on the background

fg- Bring the most recently backgrounder job to foreground

fg %1 –Bring a job to foreground by specifying job number

Control-z – Stop foreground job and return you to shell prompt. Remember this will not kill the job

Difference between Foreground and Background jobs

Foreground job can interrupt using keyboard input and signals such as Control-C from the controlling terminal, background jobs cannot. If your are disconnected from your session, foreground jobs are terminated by a hang-up signal, while backgrounds jobs are not. Both foreground and background jobs can write to the controlling terminal.

How you can put a Job in the Background

To initiate a job in the background, you have to put an ampersand (&) at the end of the command line. For example if your script name is test.sh and want to execute on the background, then use the following command at the command line.

sh test.sh &

If you want to put a job in background, which is already running on foreground, then first stop the job by pressing control-Z and type bg command.

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Published by Paresh Sarma