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Full Discussion: Need to get pid of a process and have to store the pid in a variable
Top Forums UNIX for Dummies Questions & Answers Need to get pid of a process and have to store the pid in a variable Post 302221706 by buffoonix on Tuesday 5th of August 2008 03:24:47 AM
Old 08-05-2008
Quote:
Originally Posted by milangautami
Hi ,

How to store pid of process in a variable and check its value?
Probably also already asked and answered a million times.

Here the million and first way (it really depends on your version of ps or Unix)
On Linux and Solaris we have pgrep
Code:
pid=$(pgrep name_of_cmd)

on HP-UX we would have to make ps behave in a different way by e.g.
Code:
pid=$(UNIX95= ps -C name_of_cmd -o pid=)

etc., etc.
Testing if pid holds valid content is also heavily dependent on the used shell.
In a posix shell we could do (if we were process owner or root, or omit the kill)
Code:
[[ -n $pid ]] && kill -0 $pid && echo "is alive"

 

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LEARN ABOUT NETBSD

kill

KILL(1) 						    BSD General Commands Manual 						   KILL(1)

NAME

     kill -- terminate or signal a process

SYNOPSIS

     kill [-s signal_name] pid ...
     kill -l [exit_status]
     kill -signal_name pid ...
     kill -signal_number pid ...

DESCRIPTION

     The kill utility sends a signal to the process(es) specified by the pid operand(s).

     Only the super-user may send signals to other users' processes.

     The options are as follows:

     -s signal_name
	     A symbolic signal name specifying the signal to be sent instead of the default TERM.

     -l [exit_status]
	     Display the name of the signal corresponding to exit_status.  exit_status may be the exit status of a command killed by a signal (see
	     the special sh(1) parameter '?') or a signal number.

	     If no operand is given, display the names of all the signals.

     -signal_name
	     A symbolic signal name specifying the signal to be sent instead of the default TERM.

     -signal_number
	     A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.

     The following pids have special meanings:
     -1      If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.
     0	     Broadcast the signal to all processes in the current process group belonging to the user.

     Some of the more commonly used signals:
     1	     HUP (hang up)
     2	     INT (interrupt)
     3	     QUIT (quit)
     6	     ABRT (abort)
     9	     KILL (non-catchable, non-ignorable kill)
     14      ALRM (alarm clock)
     15      TERM (software termination signal)

     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 argu-
     ments.  See csh(1) for details.

SEE ALSO

     csh(1), pgrep(1), pkill(1), ps(1), kill(2), sigaction(2), signal(7)

STANDARDS

     The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

     A kill command appeared in Version 6 AT&T UNIX.

BSD
								  April 28, 1995							       BSD
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