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app

In the simple case of a string argument to app, the source file is moved to the target ~/Applications directory. For example:

app 'Alfred 2.app'

moves the source to:

~/Applications/Alfred 2.app

from a source file such as:

/opt/homebrew-cask/Caskroom/alfred/2.8.2_431/Alfred 2.app

Renaming the Target

You can rename the target which appears in your /Applications directory by adding a target: key to app. Example (from scala-ide.rb):

app 'eclipse/Eclipse.app', target: 'Scala IDE.app'

target: May Contain an Absolute Path

If target: has a leading slash, it is interpreted as an absolute path. The containing directory for the absolute path will be created if it does not already exist. Example (from manopen.rb):

artifact 'openman.1', target: '/usr/local/share/man/man1/openman.1'

target: Works on Most Artifact Types

The target: key works similarly for most Cask artifacts, such as app, binary, colorpicker, font, input_method, prefpane, qlplugin, service, suite, and artifact.

target: Should Only Be Used in Select Cases

Don’t use target: for aesthetic reasons, like removing version numbers (app "Slack #{version}.app", target: 'Slack.app'). With app, use it when it makes sense functionally and document your reason cleary in the Cask: was it for clarity; for consistency; to prevent conflicts; due to developer suggestion? With binary you can take some extra liberties to be consistent with other command-line tools, like changing case or removing an extension.