Re: [opensuse] Help Killling Process
- From: Randall R Schulz <rschulz@xxxxxxxxx>
- Date: Tue, 20 Mar 2007 10:21:27 -0700
Donald,
On Tuesday 20 March 2007 09:58, Donald D Henson wrote:
I seem to have gotten myself into a situation where a Firefox process
will not die nor will it display anything. (The problem seems to have
something to do with You Tube.)
By which you mean it has something to do with the Flash plug-in, which
YouTube uses to display all its video (that's there "innovation").
When I try to start up another
instance of Firefox, I get an error message that tells me to either
close the current process or to reboot the system. Rebooting is not a
good solution. I remember from the 'old days' that there is a cli
command to identify a process id and another one to kill a process.
I've searched my memory and the User Manual but cannot identify those
two commands. Any assistance will be sincerely appreciated.
The command "pidof" tells the process IDs for all running instances of a
given executable. (You should know that Firefox's executable binary is
called "firefox-bin", not "firefox".)
The command "ps" lists running processes. By default, it lists only
those started by you and associated with the same terminal from which
the ps command was issued. If you add the "-a" option, it will show all
of your processes that are associated with some tty (which still
excludes most GUI processes). Using "ps -u yourLoginNameOrUserID" will
show all of your processes without regard to controlling tty.
Using "ps -ax" will show all processes running on the system,
regardless of who started them or whether they have a controlling tty.
Kill is the command that sends signals to processes.
The default signal sent by kill, SIGTERM, or 15, is a polite request for
a process to shut down. It gets to perform whatever clean-up processing
it requires. By the same token, the process can ignore such a request.
The unignorable kill signal (SIGKILL or 9) cannot be intercepted by the
process in order to perform clean-up operations (or to refuse to die),
so it will kill the process if at all possible. It's never preferable
to use SIGKILL, at least not before trying SIGTERM.
Kill exists as a shell built-in, so you can use "help kill" to get usage
information.
Randall Schulz
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