Updated: 2021/Apr/14

WAIT(1)                     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
             information 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")

NetBSD 9.99                      June 5, 1993                      NetBSD 9.99