Sometimes I see articles saying command of brew tap before brew install something. I am wondering what does tap mean? And why must I run tap before install?
brew tap.
homebrew) because when you tap a keg of beer you are essentially knocking a valve into it to "gain access to the beer".
The tap command allows Homebrew to tap into another repository of formulae. Once you've done this you've expanded your options of installable software.
These additional Git repos (inside /usr/local/Homebrew/Library/Taps) describe sets of package formulae that are available for installation.
E.g.
brew tap # list tapped repositories
brew tap <tapname> # add tap
brew untap <tapname> # remove a tap
brew tap adds more repos to the list of formulae that brew tracks, updates, and installs from
brew tap <user>/<repo> makes a shallow clone of the repository at https://github.com/user/homebrew-repo. Note that brew tap prefixes the repo name with "homebrew-". After that, brew will be able to work on those formulae as if they were in Homebrew's canonical repository
The full documentation can be found here with all the available options.
Homebrew Terminology:
package ≡ formula ≡ ruby file: this typically deals with command line (CLI) software
bottle: binary program already built for macOS (configurations and make is already done)
casks: GUI program or font; this is an extension of homebrew that allows us to install MacOS native applications like: Google Chrome (brew cask install google-chrome), iTerm (" " iterm2), Visual Studio Code (" " visual-studio-code), etc. As well as install fonts: Roboto[ Mono] (" " font-roboto/" " font-roboto-mono), Latin Modern (" " font-latin-modern), etc.
taps: [Github|Gitlab|...] repositories containing additional [formulas for downloading] packages that are not standard, i.e not incorporated into the official homebrew repository containing all [formulas for downloadable] packages. "taps" allow you to extend the list of packages that you can install via homebrew. by "tapping" a repository you download (literally git clone) the repository locally. the repository wil contain ruby files (formulas) that tell homebrew how to download, configure, build, install, etc, an additional list of packages. then when you do brew install X, brew will scan through the official/standard homebrew repositories that you have locally, won't find a formula for X, then it will scan through your "taps" and if it finds a formula for X, will run it (the formula is a ruby file).
Packages are installed into /usr/local/Cellar/
Homebrew core repo formulae: downloaded to /usr/local/Homebrew/Library/taps/homebrew/homebrew-core/formula
downloaded to /usr/local/Homebrew/Library/taps/homebrew/homebrew-core/formula
You can find any package at: https://formulae.brew.sh/
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brew caskseems to add thecaskroom/caskrepo. Is that a shortcut and essentially the same asbrew tap caskroom/cask?brew tapwill add an unofficial, third-party repository?