WAIT(1) BSD Reference Manual WAIT(1)
wait - await process completion
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 oth- er 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 ex- isting 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 its exit status information was avail- able 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- ble. MirOS BSD #10-current June 5, 1993 1
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