mirror of
https://github.com/flokoe/bash-hackers-wiki.git
synced 2024-11-01 14:53:06 +01:00
40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
====== The wait builtin command ======
|
|
|
|
===== Synopsis =====
|
|
<code>wait [-f] [-n] [-p VARNAME] [ID...]</code>
|
|
|
|
===== Description =====
|
|
The ''wait'' builtin command is used to wait for job completion and return exit status.
|
|
|
|
* if ''ID'' is a job specification, it waits for all processes in the pipeline of this job
|
|
* waits for a specific job (asynchronous command) and report its exit status if one or more ''ID'' is given
|
|
* waits for all running jobs (asynchronous commands)
|
|
* waits for "the next" job (''-n'' option)
|
|
* waits for termination instead of status change (''-f'' option)
|
|
|
|
''ID'' may be an operating system process identifier or a shell job specification.
|
|
|
|
==== Options ====
|
|
|
|
^ Option ^ Description ^
|
|
| ''-n'' | Waits for "the next" child to exit (as opposed to "all children" without this option). Accepts a list of IDs (jobs) |
|
|
| ''-f'' | Waits for the termination of the given ''ID'' (instead of waiting for a status change only) |
|
|
| ''-p VARNAME'' | When waiting for a list (-n) or all jobs, writes the job ID to the job that was actually terminated into the variable ''VARNAME'' |
|
|
|
|
==== Return status ====
|
|
|
|
The return status is the return status of the job waited for, or
|
|
|
|
^Status ^Reason ^
|
|
|0 |waited for all jobs in shell's job list |
|
|
|1 |the given ''ID'' is not a valid job or process ID |
|
|
|
|
===== Examples =====
|
|
|
|
|
|
===== Portability considerations =====
|
|
|
|
|
|
===== See also =====
|
|
|