WAIT man page on 4.4BSD

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WAIT(1)			  BSD General Commands Manual		       WAIT(1)

     wait — await process completion

     wait [pid]

     If invoked with no arguments, the wait utility waits until all existing
     child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a
	     background child process that still exists, the wait utility
	     waits until that process has completed and consumes its status
	     information, without consuming the status information of any
	     other process.

	     If a pid operand is specified that is not the process ID of a
	     child background process that still exists, wait exits without
	     waiting for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the
	     existing background child processes have terminated, or the
	     process specified by the pid operand exited normally with 0 as
	     its exit status.

     >0	     The specified process did not exist and its exit status informa‐
	     tion was not available, or the specified process existed or its
	     exit status information was available, and it terminated with a
	     non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a
     signal, the exit status information of wait contains that termination
     status as well.

     The wait command is expected to be IEEE Std 1003.2 (“POSIX.2”) compati‐

BSD				 June 5, 1993				   BSD

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