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https://github.com/fish-shell/fish-shell
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be451091d4
We use plural "*OPTIONS*" more often than "*OPTION*...", so let's do that everywhere. In some other places where we do have an ellipsis, make sure to use singular, since the ellipsis already means repetition. This change is incomplete, and I'm not sure if this is worth it, since it's subjective, so I might drop it.
100 lines
4 KiB
ReStructuredText
100 lines
4 KiB
ReStructuredText
.. _cmd-fish:
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.. program::fish
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fish - the friendly interactive shell
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=====================================
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Synopsis
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--------
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| ``fish`` [*OPTIONS*] [*FILE* [ARG ...]]
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| ``fish`` [*OPTIONS*] [**-c** *COMMAND* [ARG ...]]
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Description
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-----------
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:command:`fish` is a command-line shell written mainly with interactive use in mind.
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This page briefly describes the options for invoking :command:`fish`.
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The :ref:`full manual <intro>` is available in HTML by using the :command:`help` command from inside fish, and in the `fish-doc(1)` man page.
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The :ref:`tutorial <tutorial>` is available as HTML via ``help tutorial`` or in `man fish-tutorial`.
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The following options are available:
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**-c** or **--command=COMMAND**
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Evaluate the specified commands instead of reading from the commandline, passing additional positional arguments through ``$argv``.
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**-C** or **--init-command=COMMANDS**
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Evaluate specified commands after reading the configuration but before executing command specified by **-c** or reading interactive input.
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**-d** or **--debug=DEBUG_CATEGORIES**
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Enables debug output and specify a pattern for matching debug categories.
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See :ref:`Debugging <debugging-fish>` below for details.
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**-o** or **--debug-output=DEBUG_FILE**
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Specifies a file path to receive the debug output, including categories and :envvar:`fish_trace`.
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The default is stderr.
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**-i** or **--interactive**
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The shell is interactive.
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**-l** or **--login**
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Act as if invoked as a login shell.
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**-N** or **--no-config**
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Do not read configuration files.
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**-n** or **--no-execute**
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Do not execute any commands, only perform syntax checking.
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**-p** or **--profile=PROFILE_FILE**
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when :command:`fish` exits, output timing information on all executed commands to the specified file.
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This excludes time spent starting up and reading the configuration.
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**--profile-startup=PROFILE_FILE**
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Will write timing for ``fish`` startup to specified file.
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**-P** or **--private**
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Enables :ref:`private mode <private-mode>`: **fish** will not access old or store new history.
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**--print-rusage-self**
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When :command:`fish` exits, output stats from getrusage.
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**--print-debug-categories**
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Print all debug categories, and then exit.
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**-v** or **--version**
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Print version and exit.
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**-f** or **--features=FEATURES**
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Enables one or more comma-separated :ref:`feature flags <featureflags>`.
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The ``fish`` exit status is generally the :ref:`exit status of the last foreground command <variables-status>`.
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.. _debugging-fish:
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Debugging
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---------
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While fish provides extensive support for :ref:`debugging fish scripts <debugging>`, it is also possible to debug and instrument its internals.
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Debugging can be enabled by passing the **--debug** option.
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For example, the following command turns on debugging for background IO thread events, in addition to the default categories, i.e. *debug*, *error*, *warning*, and *warning-path*:
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::
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> fish --debug=iothread
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Available categories are listed by ``fish --print-debug-categories``. The **--debug** option accepts a comma-separated list of categories, and supports glob syntax.
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The following command turns on debugging for *complete*, *history*, *history-file*, and *profile-history*, as well as the default categories:
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::
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> fish --debug='complete,*history*'
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Debug messages output to stderr by default. Note that if :envvar:`fish_trace` is set, execution tracing also outputs to stderr by default. You can output to a file using the **--debug-output** option:
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::
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> fish --debug='complete,*history*' --debug-output=/tmp/fish.log --init-command='set fish_trace on'
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These options can also be changed via the :envvar:`FISH_DEBUG` and :envvar:`FISH_DEBUG_OUTPUT` variables.
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The categories enabled via **--debug** are *added* to the ones enabled by $FISH_DEBUG, so they can be disabled by prefixing them with **-** (**reader-*,-ast*** enables reader debugging and disables ast debugging).
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The file given in **--debug-output** takes precedence over the file in :envvar:`FISH_DEBUG_OUTPUT`.
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