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02d82dcf85
Adds synopses for those commands missing them. Moves all synopsis sections to code blocks. This improves the appearance, although highlighting as fish code may not be the ideal appearance.
49 lines
1.7 KiB
ReStructuredText
49 lines
1.7 KiB
ReStructuredText
.. _cmd-case:
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case - conditionally execute a block of commands
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================================================
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Synopsis
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--------
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::
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switch VALUE; [case [WILDCARD...]; [COMMANDS...]; ...] end
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Description
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-----------
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``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.
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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.
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Note that fish does not fall through on case statements. Only the first matching case is executed.
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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.
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Example
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-------
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Say \$animal contains the name of an animal. Then this code would classify it:
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::
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switch $animal
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case cat
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echo evil
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case wolf dog human moose dolphin whale
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echo mammal
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case duck goose albatross
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echo bird
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case shark trout stingray
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echo fish
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# Note that the next case has a wildcard which is quoted
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case '*'
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echo I have no idea what a $animal is
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end
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If the above code was run with ``$animal`` set to ``whale``, the output
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would be ``mammal``.
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If ``$animal`` was set to "banana", it would print "I have no idea what a banana is".
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