Processes Lab Post: 302778209

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Homework and Emergencies Homework & Coursework Questions Processes Lab Post 302778209 by bakunin on Sunday 10th of March 2013 05:17:17 AM

03-10-2013

Registered User

Your solutions are correct to the point that they are working. The following is just a bit of additional information you might find useful. I noticed, that you have no solution for question 2.7, probably an oversight?

RudiC is correct: "kill -9" means the OS actively terminates the process. "kill -15" on the other hand tells the process to shut down immediately. In your case this will not make that much difference, but if a process has open temporary files or logs to be written, or any other allocated resources, "kill -15" will allow it to neatly close all these before exiting while "kill -9" will leave all these open and hanging in limbo.

I don't know which shell you use, but most probably it is either bash or ksh. In both cases you can make use of the job control of this shell: issue "jobs" to see a list of jobs in the background and use "kill %<number>" instead of "kill <PID>" to address the process.

The "kill" command can take a list of PIDs to process. Instead of

Code:

kill -9 <PID1>
kill -9 <PID2>
kill -9 <PID3>
...

it is posssible to write

Code:

kill -9 <PID1> <PID2> <PID3> ...

I hope this helps.

bakunin

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killall

killall(1M)															       killall(1M)

NAME

       killall - kill all active processes

SYNOPSIS

       [signal]

DESCRIPTION

       is a procedure used by to kill all active processes not directly related to the shutdown procedure.

       is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted.  sends
       the specified signal to all user processes in the system, with the following exceptions:

	      the process;

	      all processes (including background processes) associated with the terminal from which was invoked;

	      any process, if owned by

	      any process, if owned by

	      any process;

	      any process;

	      any process.

       obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).

       If no signal is specified, a default of (kill) is used.

       is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).

FILES

SEE ALSO

       fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).

STANDARDS CONFORMANCE

																       killall(1M)