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Full Discussion: Killing a shell script
Top Forums Shell Programming and Scripting Killing a shell script Post 302348273 by achenle on Thursday 27th of August 2009 08:24:10 PM
Old 08-27-2009
I'm not sure if it's available in OS X, but the "kill" utility - not the shell built-in command - has the ability to kill entire process groups:

Code:
/usr/bin/kill -15 -- -1234

That example would send the SIGTERM signal to all processes in the process group that process 1234 is in. The double-dash argument is necessary to indicate that the end of options has been reached and allow the PID argument to be interpreted as a negative PID instead of an erroneous numeric option.

Note that the shell built-in kill command in my experience does not have this capability, so you can't just type "kill ...." and get this effect - that will invoke the shell's built-in command.

The problem with using the kill utility in this manner is that a shell script is usually part of the same process group as the login shell that started it. So if you kill the shell script this way, you'll kill your login script, too.

Generally, the "setsid()" call is used in compiled programs to create a new process group. I'm not aware of any ways to do that in a shell script, but there may be. I'm certainly no expert on OS X particulars.
 

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LEARN ABOUT SUSE

kill

KILL(1) 							   User Commands							   KILL(1)

NAME

       kill - send signals to processes, or list signals

SYNOPSIS

       kill [-s SIGNAL | -SIGNAL] PID...
       kill -l [SIGNAL]...
       kill -t [SIGNAL]...

DESCRIPTION

       Send signals to processes, or list signals.

       Mandatory arguments to long options are mandatory for short options too.

       -s, --signal=SIGNAL, -SIGNAL

	      specify the name or number of the signal to be sent

       -l, --list
	      list signal names, or convert signal names to/from numbers

       -t, --table
	      print a table of signal information

       --help display this help and exit

       --version
	      output version information and exit

       SIGNAL  may  be	a  signal name like `HUP', or a signal number like `1', or the exit status of a process terminated by a signal.  PID is an
       integer; if negative it identifies a process group.

       NOTE: your shell may have its own version of kill, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Paul Eggert.

REPORTING BUGS

       Report kill bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       kill(2)

       The  full documentation for kill is maintained as a Texinfo manual.  If the info and kill programs are properly installed at your site, the
       command

	      info coreutils 'kill invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								   KILL(1)
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