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\section switch switch - conditionally execute a block of commands
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\subsection switch-synopsis Synopsis
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<tt>switch VALUE; [case [WILDCARD...]; [COMMANDS...]; ...] end</tt>
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\subsection switch-description Description
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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
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\c switch performs one of several blocks of commands, depending on whether
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a specified value equals one of several wildcarded values. \c case is used
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together with the \c switch statement in order to determine which block should
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be executed.
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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
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Each \c case command is given one or more parameters. The first \c case
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command with a parameter that matches the string specified in the
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switch command will be evaluated. \c case parameters may contain
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wildcards. These need to be escaped or quoted in order to avoid
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regular wildcard expansion using filenames.
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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
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Note that fish does not fall through on case statements. Only the
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first matching case is executed.
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2005-09-20 21:31:55 +08:00
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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
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Note that command substitutions in a case statement will be
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evaluated even if its body is not taken. All substitutions, including
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command substitutions, must be performed before the value can be compared
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against the parameter.
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\subsection switch-example Example
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If the variable \$animal contains the name of an animal, the following
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code would attempt to classify it:
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<pre>
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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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case '*'
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echo I have no idea what a $animal is
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end
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</pre>
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If the above code was run with \c \$animal set to \c whale, the output
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would be \c mammal.
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