kill -9

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# 1  
Old 07-03-2011
kill -9

i want know the the diffrence between kill and kill -9
# 2  
Old 07-03-2011
It's perhaps the difference between asking and telling...

kill on its own asks the process to exit nicely (please "die" - kill -15 (SIGTERM)).

kill -9 (or kill -kill) says DIE (I've read it quoted as die with extreme prejudice!)

kill -9 might be necessary at times, but it's generally to be avoided, as it doesn't give the process any chance to clean up after itself. There are nicer signals to try before sending in the cavalry!.
# 3  
Old 07-04-2011
@scottn "preap <pid>" is better than "kill -9".

Pls let me know if I'm wrong.
# 4  
Old 07-04-2011
@saps19: The main issue would be that preap is available only on Solaris, whereas kill is universal to all OS adhering to the POSIX standard.
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