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### 36.6 Process, Group, and User IDs

Built-in Function: pgid = getpgrp ()

  Return the process group id of the current process.

Built-in Function: pid = getpid ()

  Return the process id of the current process.

Built-in Function: pid = getppid ()

  Return the process id of the parent process.

Built-in Function: euid = geteuid ()

  Return the effective user id of the current process.

Built-in Function: uid = getuid ()

  Return the real user id of the current process.

Built-in Function: egid = getegid ()

  Return the effective group id of the current process.

Built-in Function: gid = getgid ()

  Return the real group id of the current process.