LINUX CLASSES - LINUX BASICS
How Do I Stop a Running Program?
Stop That Task!
Although it's unfortunate, some tasks are unruly and must be killed. If you accidentally entered the (fictitious) command seek_and_destroy &
you'd have a background task doing potentially nasty things. Pressing the ctrl-C key would have no effect, since it can terminate only a foreground task. Before this rogue eats your system alive, issue the ps -f
command to find out the process ID (PID) of the seek_and_destroy task:
UID PID PPID STIME TTY TIME COMD
hermie 24 1 00:35:28 tty1 0:01 bash
hermie 1704 24 00:36:39 tty1 0:00 seek_and_destroy
Note that the offender has a PID of 1704 and then quickly issue the command
to terminate the background task.
You can terminate any active task with the kill command, which sends a "terminate gracefully" signal to the running task that allows it to do any necessary cleanup, close files, and so on before giving up the ghost. Occasionally, though
, a task will not respond to the kill command, either because a program has become disabled or is coded specifically to ignore it. Time for the heavy artillery. Adding the -9 flag to the kill command, as i
kill -9 1704
basically sends the "die you gravy-sucking pig" signal to the running task and forces it to shut down immediately without any chance to do cleanup. Use this flag only as a last resort, since it could cause work in progress (by the soon-
to-be-killed task) to be lost.
For more information on the kill command, see the
Previous Lesson: Processes
Next Lesson: Environment Variables
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Comments - most recent first
(Please feel free to answer questions posted by others!)
(05 Feb 2013, 07:11
there are two simple commands one is to view the background running jobs
the is #bg
and the second one is #fg to get the improperly closed job to foreground
and then close it.
NOTE: never use ctrl+z key because the job will not be terminated but it
goes and runes in background.
(05 Dec 2011, 07:51
To use this linux you don't need a computer, usually a car is enough. Since
when there is more than ONE Internet? GEEEEEEEEEEEEEEZZZZZZZZZZZZZZ
(04 Dec 2011, 22:15
Do I need to make purchase a computer for using this Linux? Will I go to
(09 Nov 2011, 19:45
Yeah you are right, I think they are stupids.
(07 Oct 2011, 21:23
It seems that people commenting here are either stupid or spammers
(29 Aug 2011, 01:18
how to start STAF(software testing automation framework) automatically when
machine is started in Linux?
please give me explanation?
reply me soon...:)
(23 Feb 2011, 08:08
Linux is not commonly used here and should i go for it,i would be operating
in my own world. what plans do u have to popularize it?
(08 Aug 2010, 11:46
I tend to use:
ps -A | grep (offending process) to locate what I know is the cause. For
example if firefox is hanging I do:
ps -A | grep firefox.
That points me right to the offending process.
I welcome your comments. However... I am puzzled by many people
who say "Please send me the Linux tutorial." This website *is* your Linux Tutorial! Read everything here, learn
all you can, ask questions if you like. But don't ask me to send what you already have. :-)
NO SPAM! If you post garbage, it will be deleted, and you will be banned.
by Bob Rankin
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