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1 | WAIT(1) BSD Reference Manual WAIT(1) |
2 | ||
3 | N\bNA\bAM\bME\bE | |
4 | w\bwa\bai\bit\bt - await process completion | |
5 | ||
6 | S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS | |
7 | w\bwa\bai\bit\bt [_\bp_\bi_\bd] | |
8 | ||
9 | D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN | |
10 | If invoked with no arguments, the w\bwa\bai\bit\bt utility waits until all existing | |
11 | child processes in the background have terminated. | |
12 | ||
13 | Available operands: | |
14 | ||
15 | _\bp_\bi_\bd If a _\bp_\bi_\bd operand is specified, and it is the process ID of a | |
16 | background child process that still exists, the w\bwa\bai\bit\bt utility | |
17 | waits until that process has completed and consumes its status | |
18 | information, without consuming the status information of any oth- | |
19 | er process. | |
20 | ||
21 | If a pid operand is specified that is not the process ID of a | |
22 | child background process that still exists, w\bwa\bai\bit\bt exits without | |
23 | waiting for any processes to complete. | |
24 | ||
25 | The w\bwa\bai\bit\bt utility exits with one of the following values: | |
26 | ||
27 | 0 The w\bwa\bai\bit\bt utility was invoked with no operands and all of the ex- | |
28 | isting background child processes have terminated, or the process | |
29 | specified by the pid operand exited normally with 0 as its exit | |
30 | status. | |
31 | ||
32 | >0 The specified process did not exist and its exit status informa- | |
33 | tion was not available, or the specified process existed or its | |
34 | exit status information was available, and it terminated with a | |
35 | non-zero exit status. | |
36 | ||
37 | If the specified process terminated abnormally due to the receipt of a | |
38 | signal, the exit status information of w\bwa\bai\bit\bt contains that termination | |
39 | status as well. | |
40 | ||
41 | S\bST\bTA\bAN\bND\bDA\bAR\bRD\bDS\bS | |
42 | The w\bwa\bai\bit\bt command is expected to be IEEE Std1003.2 (``POSIX'') compatible. | |
43 | ||
44 | 4.4BSD June 5, 1993 1 |