Unix Tip: KILL REALLY DOES NOT KILL

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3020 - May 14, 2010

http://www.ugu.com/sui/ugu/show?tip.today

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KILL REALLY DOES NOT KILL

kill is not really meant only to kill a process. But main intention is to send a signal to process.And the process handles these signals to do various tasks.

kill -INT 1234
#where 1234 is the Process ID is really, this set an interrupt signal, Ctrl-C is an example of interupt signal given to shell.

kill -HUP 1234
#some UNIX daemons handle this, to do refreshing business.

kill -KILL 1234
This is the sure kill,which cannot be handled by any process.
Also know as, kill -9 1234.

Just, check the in the file /usr/include/sys/signal.h for all signals on the system.

More about this can be found on kill and signal man pages.

This tip generously supported by: dkotian1@rediffmail.com

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