case - conditionally execute a block of commands¶
switch VALUE [case [GLOB ...] [COMMAND ...]] end
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.
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.
Say $animal contains the name of an animal. Then this code would classify it:
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
If the above code was run with
$animal set to
whale, the output
$animal was set to “banana”, it would print “I have no idea what a banana is”.