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.. _cmd-disown:
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disown - remove a process from the list of jobs
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===============================================
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Synopsis
--------
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docs synopsis: add HTML highlighing and automate manpage markup
Recent synopsis changes move from literal code blocks to
[RST line blocks]. This does not translate well to HTML: it's not
rendered in monospace, so aligment is lost. Additionally, we don't
get syntax highlighting in HTML, which adds differences to our code
samples which are highlighted.
We hard-wrap synopsis lines (like code blocks). To align continuation
lines in manpages we need [backslashes in weird places]. Combined with
the **, *, and `` markup, it's a bit hard to get the alignment right.
Fix these by moving synopsis sources back to code blocks and compute
HTML syntax highlighting and manpage markup with a custom Sphinx
extension.
The new Pygments lexer can tokenize a synopsis and assign the various
highlighting roles, which closely matches fish's syntax highlighing:
- command/keyword (dark blue)
- parameter (light blue)
- operator like and/or/not/&&/|| (cyan)
- grammar metacharacter (black)
For manpage output, we don't project the fish syntax highlighting
but follow the markup convention in GNU's man(1):
bold text type exactly as shown.
italic text replace with appropriate argument.
To make it easy to separate these two automatically, formalize that
(italic) placeholders must be uppercase; while all lowercase text is
interpreted literally (so rendered bold).
This makes manpages more consistent, see string-join(1) and and(1).
Implementation notes:
Since we want manpage formatting but Sphinx's Pygments highlighing
plugin does not support manpage output, add our custom "synopsis"
directive. This directive parses differently when manpage output is
specified. This means that the HTML and manpage build processes must
not share a cache, because the parsed doctrees are cached. Work around
this by using separate cache locations for build targets "sphinx-docs"
(which creates HTML) and "sphinx-manpages". A better solution would
be to only override Sphinx's ManualPageBuilder but that would take a
bit more code (ideally we could override ManualPageWriter but Sphinx
4.3.2 doesn't really support that).
---
Alternative solution: stick with line blocks but use roles like
:command: or :option: (or custom ones). While this would make it
possible to produce HTML that is consistent with code blocks (by adding
a bit of CSS), the source would look uglier and is harder to maintain.
(Let's say we want to add custom formatting to the [|] metacharacters
in HTML. This is much easier with the proposed patch.)
---
[RST line blocks]: https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#line-blocks
[backslashes in weird places]: https://github.com/fish-shell/fish-shell/pull/8626#discussion_r782837750
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.. synopsis ::
disown [PID ...]
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Description
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-----------
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`` disown `` removes the specified :ref: `job <syntax-job-control>` from the list of jobs. The job itself continues to exist, but fish does not keep track of it any longer.
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This will make fish lose all knowledge of the job, so functions defined with `` --on-process-exit `` or `` --on-job-exit `` will no longer fire.
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Jobs in the list of jobs are sent a hang-up signal when fish terminates, which usually causes the job to terminate; `` disown `` allows these processes to continue regardless.
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If no process is specified, the most recently-used job is removed (like :doc: `bg <bg>` and :doc: `fg <fg>` ). If one or more PIDs are specified, jobs with the specified process IDs are removed from the job list. Invalid jobs are ignored and a warning is printed.
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If a job is stopped, it is sent a signal to continue running, and a warning is printed. It is not possible to use the :doc: `bg <bg>` builtin to continue a job once it has been disowned.
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`` disown `` returns 0 if all specified jobs were disowned successfully, and 1 if any problems were encountered.
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The **--help** or **-h** option displays help about using this command.
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Example
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-------
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`` firefox &; disown `` will start the Firefox web browser in the background and remove it from the job list, meaning it will not be closed when the fish process is closed.
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`` disown (jobs -p) `` removes all :doc: `jobs <jobs>` from the job list without terminating them.