Trouver un PID

johand@horus:~$ ls -l > /dev/null &
[1] 21691

man 2 getpid
NAME
       getpid, getppid - get process identification

SYNOPSIS
       #include <sys/types.h>
       #include <unistd.h>

       pid_t getpid(void);
       pid_t getppid(void);

DESCRIPTION

       getpid() returns the process ID of the current process.  (This is often
       used by routines that generate unique temporary file names.)

       getppid() returns the process ID of the parent of the current  process.

CONFORMING TO
      POSIX, 4.3BSD, SVID