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Full Discussion: Check if PID exists
Top Forums Shell Programming and Scripting Check if PID exists Post 302778729 by radoulov on Monday 11th of March 2013 12:15:16 PM
Old 03-11-2013
Assuming the variable pid contains your pid and the user that executes the command has the right privileges:
Code:
kill -0 $pid 2>/dev/null && 
  printf '%d exists\n' $pid || 
    printf '%d does not exist\n' $pid

This User Gave Thanks to radoulov For This Post:
alister
 

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LEARN ABOUT REDHAT

setsid

SETSID(2)						     Linux Programmer's Manual							 SETSID(2)

NAME

       setsid - creates a session and sets the process group ID

SYNOPSIS

       #include <unistd.h>

       pid_t setsid(void);

DESCRIPTION

       setsid() creates a new session if the calling process is not a process group leader.  The calling process is the leader of the new session,
       the process group leader of the new process group, and has no controlling tty.  The process group ID and session ID of the calling  process
       are set to the PID of the calling process.  The calling process will be the only process in this new process group and in this new session.

RETURN VALUE

       The session ID of the calling process.

ERRORS

       On  error,  -1  will be returned.  The only error which can happen is EPERM. It is returned when the process group ID of any process equals
       the PID of the calling process. Thus, in particular, setsid fails if the calling process is already a process group leader.

NOTES

       A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid will succeed,  fork	and  exit,
       and have the child do setsid().

CONFORMING TO

       POSIX, SVr4.

SEE ALSO

       setpgid(2), setpgrp(2)

Linux 1.0.0							    1994-08-27								 SETSID(2)
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