pwait —
wait for processes to terminate
  
    | pwait | [ -isv] [-ttimeout] pid ... | 
The pwait utility will wait until each of the given
  processes has terminated.
The following option is available:
  - -i
- Don't wait for all the processes, exit after the first process or group of
      processes exit.
- -s
- Exit with the status code of the first non-zero exit status pid, or if
      timed out exit with 255.
- -ttimeout
- Only wait for timeout seconds before exiting.
- -v
- Print the exit status when each process terminates.
Thepwait utility returns 0 on success, and >0 if an
  error occurs.
Invalid pids elicit a warning message but are otherwise
  ignored.
pwait is not a substitute for the
  wait(1) builtin as it will not
  clean up any zombies or state in the parent process.
A pwait command first appeared in SunOS 5.8.