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Top Forums Shell Programming and Scripting How to find pid of PS which executed by perl system function Post 302218928 by KevinADC on Sunday 27th of July 2008 03:17:32 PM
Old 07-27-2008
These lines look wrong:

f(kill 0 => $ps){print "process : $ps is alive\n";}
kill 1 , $ps;
sleep(1);
if(kill 0 => $ps){print "process : $ps is alive\n";}

the "=>" operator should be ">=" to compare values. "=>" is the comma operator that is used for a different purpose.

I know there are modules you can use to check pids but I don't know if they are anymore efficient than your method. Hopefully someone else will have a suggestion.
 

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kill(1) 						      General Commands Manual							   kill(1)

Name
       kill - send a signal to a process

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

Description
       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.

Options
       -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
	    prefix.

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

																	   kill(1)
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