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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
Old 08-16-2012
Try killing the process ID group with:

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

 

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KILL(1) 						      General Commands Manual							   KILL(1)

NAME
kill - terminate a process with extreme prejudice SYNOPSIS
kill [ -sig ] processid ... kill -l DESCRIPTION
Kill sends the TERM (terminate, 15) signal to the specified processes. If a signal name or number preceded by `-' is given as first argu- ment, that signal is sent instead of terminate (see sigvec(2)). The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG prefix. The terminate signal will kill 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 (i.e. processes resulting from the current login) are signaled (but beware: this works only if you use sh(1); not if you use csh(1).) Negative process numbers also have special meanings; see kill(2) for details. The killed processes must belong to the current user unless he is the super-user. The process number of an asynchronous process started with `&' is reported by the shell. Process numbers can also be found by using ps(1). Kill is a built-in to csh(1); it allows job specifiers of the form ``%...'' as arguments so process id's are not as often used as kill arguments. See csh(1) for details. SEE ALSO
csh(1), ps(1), kill(2), sigvec(2) BUGS
A replacement for ``kill 0'' for csh(1) users should be provided. 4th Berkeley Distribution April 20, 1986 KILL(1)
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