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[[POSIX]] specifies job control commands {{endash}} modeled after the Korn shell job control commands.<ref>{{man|cu|bg|SUS}}; {{man|cu|fg|SUS}}.</ref>. Command {{code|bg}} resumes the foreground job paused via Ctrl-Z as a background task. Command {{code|fg}} caused the background task to run in the foreground. Command [[wait (command)|<code>wait</code>]] pauses the interactive session until specified background jobs (of the active shell) complete. Specifying no jobs selects all jobs.<ref>{{cite web | last=Kerrisk| first=Michael |date=Feb 2, 2025 |title=wait(1p) — Linux manual page |website=man7.org |url=https://www.man7.org/linux/man-pages/man1/wait.1p.html |publisher= |access-date=May 13, 2025}} </ref>
Job control was first implemented in the [[C shell]] by Jim Kulp,<ref>▼
Foreword by [[Bill Joy]] in {{cite book▼
| first = Gail▼
| last = Anderson▼
| author2 = Paul Anderson▼
| year = 1986▼
| title = The UNIX C Shell Field Guide▼
| page = xvii▼
| publisher = Prentice-Hall▼
| isbn = 0-13-937468-X▼
| url-access = registration▼
| url = https://archive.org/details/unixcshellfieldg00ande▼
}}▼
</ref> then at [[IIASA]] in Austria, making use of features of the 4.1[[BSD]] kernel.▼
The [[KornShell]], developed at [[Bell Labs]], adopted it and it was later incorporated into the SVR4 version of the [[Bourne shell]], and exists in most modern Unix shells.▼
==Overview==
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Job control and job IDs are typically only used in interactive use, where they simplify referring to process groups; in scripting PGIDs are used instead, as they are more precise and robust, and indeed job control is disabled by default in bash scripts.
▲Job control was first implemented in the [[C shell]] by Jim Kulp,<ref>
▲Foreword by [[Bill Joy]] in {{cite book
▲ | first = Gail
▲ | last = Anderson
▲ | author2 = Paul Anderson
▲ | year = 1986
▲ | title = The UNIX C Shell Field Guide
▲ | page = xvii
▲ | publisher = Prentice-Hall
▲ | isbn = 0-13-937468-X
▲ | url-access = registration
▲ | url = https://archive.org/details/unixcshellfieldg00ande
▲ }}
▲</ref> then at [[IIASA]] in Austria, making use of features of the 4.1[[BSD]] kernel.
▲The [[KornShell]], developed at [[Bell Labs]], adopted it and it was later incorporated into the SVR4 version of the [[Bourne shell]], and exists in most modern Unix shells.
==Implementation==
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