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Full Discussion: kill -9
Top Forums UNIX for Dummies Questions & Answers kill -9 Post 302535992 by Scott on Sunday 3rd of July 2011 05:03:02 PM
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!.
 

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LEARN ABOUT OSX

kill.d

kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME

       kill.d - snoop process signals as they occur. Uses DTrace.

SYNOPSIS

       kill.d

DESCRIPTION

       kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
       ber and result.

       This program can be used to determine which process is sending signals to which other process.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Default output, print process signals as they are sent.
	      # kill.d

FIELDS

       FROM   source PID

       COMMAND
	      source command name

       TO     destination PID

       SIG    destination signal ("9" for a kill -9)

       RESULT result of signal (-1 is for failure)

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       kill.d will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), truss(1)

version 0.90							   May 14, 2005 							kill.d(1m)
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