04-21-2006
See this post for more details -
PS Command Field
There is an example provided in the external link in the above post. That should help you.
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getpid(2) System Calls Manual getpid(2)
NAME
getpid, getpgrp, getppid - Gets the process ID, process group ID, parent process ID
SYNOPSIS
#include <unistd.h>
pid_t getpid( void );
pid_t getpgrp( void );
pid_t getppid( void );
Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being
developed for multiple platforms. The additional #include statement is not required on Tru64 UNIX systems or by ISO or X/Open standards,
but may be required on other vendors' systems that conform to these standards.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
getpid(), getpgrp(), getppid(): POSIX.1, XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
DESCRIPTION
The getpid() function returns the process ID of the calling process.
The getpgrp() function returns the process group ID of the calling process.
The getppid() function returns the parent process ID of the calling process. When a process is created, its parent process ID is the
process ID of its parent process. If a parent process exits, the parent process IDs of its child processes are changed to the process ID
of the init program.
RELATED INFORMATION
System calls: fork(2), kill(2), setpgid(2), setsid(2), wait(2)
Standards: standards(5) delim off
getpid(2)