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Top Forums Shell Programming and Scripting A script that kills previous instances of itself upon running not killing child processes Post 302687543 by Chubler_XL on Thursday 16th of August 2012 07:09:07 PM
Try killing the process ID group with:

/bin/kill -$(/usr/bin/tail -1 ${pidFile})

Note: you are passing a negative number of the parent shell to kill. all child shells should be in the process group of the parent shell.

Also, some implementations of kill require -- to avoid -$PID being interpreted as a signal number eg:
/bin/kill -- $(/usr/bin/tail -1 ${pidFile})

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kill(1) 						      General Commands Manual							   kill(1)

       kill - send a signal to a process

       kill [-sig] processid...
       kill -l

       The command sends the TERM (terminate, 15) signal to the specified processes.  If a signal name or number preceded by `-' is given as first
       argument, that signal is sent instead of terminate.  For further information, see

       The terminate signal kills processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot  be  caught.
       By convention, if process number 0 is specified, all members in the process group (that is, processes resulting from the current login) are
       signaled.  This works only if you use and not if you use To kill a process it must either belong to you or you must be superuser.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be  found  by  using	It
       allows job specifiers ``%...''  so process ID's are not as often used as arguments.  See for details.

       -l   Lists  signal  names.  The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG

See Also
       csh(1), ps(1), kill(2), sigvec(2)


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