fish-shell/doc_src/case.txt

\section case case - conditionally execute a block of commands

\subsection case-synopsis Synopsis
\fish{synopsis}
switch VALUE; [case [WILDCARD...]; [COMMANDS...]; ...] end
\endfish

\subsection case-description Description

`switch` executes one of several blocks of commands, depending on whether a specified value matches one of several values. `case` is used together with the `switch` statement in order to determine which block should be executed.

Each `case` command is given one or more parameters. The first `case` command with a parameter that matches the string specified in the switch command will be evaluated. `case` parameters may contain wildcards. These need to be escaped or quoted in order to avoid regular wildcard expansion using filenames.

Note that fish does not fall through on case statements. Only the first matching case is executed.

Note that command substitutions in a case statement will be evaluated even if its body is not taken. All substitutions, including command substitutions, must be performed before the value can be compared against the parameter.


\subsection case-example Example

Say \$animal contains the name of an animal. Then this code would classify it:

\fish
switch $animal
    case cat
        echo evil
    case wolf dog human moose dolphin whale
        echo mammal
    case duck goose albatross
        echo bird
    case shark trout stingray
        echo fish
    # Note that the next case has a wildcard which is quoted
    case '*'
        echo I have no idea what a $animal is
end
\endfish

If the above code was run with `$animal` set to `whale`, the output
would be `mammal`.

If `$animal` was set to "banana", it would print "I have no idea what a banana is".
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00			`\section case case - conditionally execute a block of commands`

			`\subsection case-synopsis Synopsis`
Simplify styling 2014-08-01 20:25:41 +08:00			`\fish{synopsis}`
Documentation update Rework for Doxygen >1.8. Moved large parts of the documentation to a simplified format, making use of Markdown enhancements and fixing bad long options. 2014-08-01 10:37:32 +08:00			`switch VALUE; [case [WILDCARD...]; [COMMANDS...]; ...] end`
			`\endfish`
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00
			`\subsection case-description Description`

[docs] Some rewording to the builtins Plus some additional examples. 2018-05-14 06:36:49 +08:00			`switch` executes one of several blocks of commands, depending on whether a specified value matches one of several values. `case` is used together with the `switch` statement in order to determine which block should be executed.
Make line length, wrapping and spacing consistent 2014-08-19 20:41:23 +08:00
			Each `case` command is given one or more parameters. The first `case` command with a parameter that matches the string specified in the switch command will be evaluated. `case` parameters may contain wildcards. These need to be escaped or quoted in order to avoid regular wildcard expansion using filenames.

			`Note that fish does not fall through on case statements. Only the first matching case is executed.`

			`Note that command substitutions in a case statement will be evaluated even if its body is not taken. All substitutions, including command substitutions, must be performed before the value can be compared against the parameter.`

Expand the switch/case documentation darcs-hash:20060421083529-ac50b-f287424c0cc9377085b49492453d35a5512cbc90.gz 2006-04-21 16:35:29 +08:00
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00			`\subsection case-example Example`

[docs] Some rewording to the builtins Plus some additional examples. 2018-05-14 06:36:49 +08:00			`Say \$animal contains the name of an animal. Then this code would classify it:`
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00
Documentation update Rework for Doxygen >1.8. Moved large parts of the documentation to a simplified format, making use of Markdown enhancements and fixing bad long options. 2014-08-01 10:37:32 +08:00			`\fish`
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00			`switch $animal`
			`case cat`
			`echo evil`
			`case wolf dog human moose dolphin whale`
			`echo mammal`
Fixed various spelling mistakes. darcs-hash:20060123231706-35ec8-2a30db603eee503d944b06d101cc88ce59340309.gz 2006-01-24 07:17:06 +08:00			`case duck goose albatross`
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00			`echo bird`
			`case shark trout stingray`
			`echo fish`
Help cleanup Large list of changes, including formatting and typos for most commands. More substantive changes have been made to alias, bind, block, break, builtin, case, cd, commandline, count, else, emit, fish_config, funced, function, functions, history, math, mimedb, nextd, not, popd, prevd, pushd, pwd, random, read, set, set_color, switch, test, trap, type, ulimit, umask, and while. 2013-05-12 15:56:01 +08:00			`# Note that the next case has a wildcard which is quoted`
Expand the switch/case documentation darcs-hash:20060421083529-ac50b-f287424c0cc9377085b49492453d35a5512cbc90.gz 2006-04-21 16:35:29 +08:00			`case '*'`
			`echo I have no idea what a $animal is`
Add subdirectories darcs-hash:20050920133155-ac50b-9a14c6c664dd03afbe8e15e7c7998fcfb5c3c750.gz 2005-09-20 21:31:55 +08:00			`end`
Documentation update Rework for Doxygen >1.8. Moved large parts of the documentation to a simplified format, making use of Markdown enhancements and fixing bad long options. 2014-08-01 10:37:32 +08:00			`\endfish`
Documentation updates from Beni Cherniavsky darcs-hash:20060919145203-ac50b-bc87b8f5e6a18395e4bc3e364da4a40ad97850e7.gz 2006-09-19 22:52:03 +08:00
Documentation update Rework for Doxygen >1.8. Moved large parts of the documentation to a simplified format, making use of Markdown enhancements and fixing bad long options. 2014-08-01 10:37:32 +08:00			If the above code was run with `$animal` set to `whale`, the output
			would be `mammal`.
Documentation updates from Beni Cherniavsky darcs-hash:20060919145203-ac50b-bc87b8f5e6a18395e4bc3e364da4a40ad97850e7.gz 2006-09-19 22:52:03 +08:00
[docs] Some rewording to the builtins Plus some additional examples. 2018-05-14 06:36:49 +08:00			If `$animal` was set to "banana", it would print "I have no idea what a banana is".