Tuesday, November 20, 2007

Display Linux Session Jobs

There are times that we execute and let our scripts and/or applications to be executed from the current session inside linux terminal while doing another work. Sometimes we gave them varied process priorities as well no to interfere with other box operations and process. This is also helpful specially to those linux boxes managed by several root sysadmins. Tnis can also be executed from non-root user linux acount.

Here's how to list down and display all currently running jobs from the current session?

First, let us simulate a linux command to run in the background as shown below:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# updatedb &
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The & character tells the linux to execute to the background process, thus leaving a currently running job from the currently logged in user.

Now, here's how to list down a currently running jobs from your current session. Simply

# jobs
Result:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[1]+ Running updatedb &
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Another example.

Let's leave the find command to run into the background process like so

Run find into the background
# find /usr -name *.ver &

Check the running jobs from the background
# jobs
[1]+ Running find /usr -name *.ver &

Display PIDS of the running jobs in the background

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# jobs -p
11999

# jobs -l
[1]+ 11999 Running find /usr -name *.ver &
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Ofcourse, using the linux 'ps' terminal command would also list down the job, with combination of grep filtering command as shown below

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# ps axuw | grep find
root 11999 3.3 0.1 5088 1840 pts/4 D 13:42 0:00 find /usr -name *.ver
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

There are more linux command on manipulating, moving, pausing and stopping a currently running linux job from current session.

Related:
To list out user's cron jobs, check here.
To read more cron job scheduling usage and samples, view it here.

HTH

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