brew/Library/Homebrew/manpages/footer.1.md

  * `--cache`:
    Display Homebrew's download cache. See also `HOMEBREW_CACHE`.

  * `--cache` <formula>:
    Display the file or directory used to cache <formula>.

  * `--cellar`:
    Display Homebrew's Cellar path. *Default:* `$(brew --prefix)/Cellar`, or if
    that directory doesn't exist, `$(brew --repository)/Cellar`.

  * `--cellar` <formula>:
    Display the location in the cellar where <formula> would be installed,
    without any sort of versioned directory as the last path.

  * `--env`:
    Show a summary of the Homebrew build environment.

  * `--prefix`:
    Display Homebrew's install path. *Default:* `/usr/local`

  * `--prefix` <formula>:
    Display the location in the cellar where <formula> is or would be installed.

  * `--repository`:
    Display where Homebrew's `.git` directory is located. For standard installs,
    the `prefix` and `repository` are the same directory.

  * `--repository` <user>`/`<repo>:
    Display where tap <user>`/`<repo>'s directory is located.

  * `--version`:
    Print the version number of brew to standard error and exit.

## EXTERNAL COMMANDS

Homebrew, like `git`(1), supports external commands. These are executable
scripts that reside somewhere in the `PATH`, named `brew-`<cmdname> or
`brew-`<cmdname>`.rb`, which can be invoked like `brew` <cmdname>. This allows you
to create your own commands without modifying Homebrew's internals.

Instructions for creating your own commands can be found in the docs:
<https://github.com/Homebrew/brew/blob/master/share/doc/homebrew/External-Commands.md>

## SPECIFYING FORMULAE

Many Homebrew commands accept one or more <formula> arguments. These arguments
can take several different forms:

  * The name of a formula:
    e.g. `git`, `node`, `wget`.

  * The fully-qualified name of a tapped formula:
    Sometimes a formula from a tapped repository may conflict with one in `Homebrew/homebrew`.
    You can still access these formulae by using a special syntax, e.g.
    `homebrew/dupes/vim` or `homebrew/versions/node4`.

  * An arbitrary URL:
    Homebrew can install formulae via URL, e.g.
    `https://raw.github.com/Homebrew/homebrew-core/master/Formula/git.rb`.
    The formula file will be cached for later use.

## ENVIRONMENT

  * `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`:
    When using the `S3` download strategy, Homebrew will look in
    these variables for access credentials (see
    <https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html#cli-environment>
    to retrieve these access credentials from AWS).  If they are not set,
    the `S3` download strategy will download with a public
    (unsigned) URL.

  * `BROWSER`:
    If set, and `HOMEBREW_BROWSER` is not, use `BROWSER` as the web browser
    when opening project homepages.

  * `EDITOR`:
    If set, and `HOMEBREW_EDITOR` and `VISUAL` are not, use `EDITOR` as the text editor.

  * `GIT`:
    When using Git, Homebrew will use `GIT` if set,
    a Homebrew-built Git if installed, or the system-provided binary.

    Set this to force Homebrew to use a particular git binary.

  * `HOMEBREW_BOTTLE_DOMAIN`:
    If set, instructs Homebrew to use the given URL as a download mirror for bottles.

  * `HOMEBREW_BROWSER`:
    If set, uses this setting as the browser when opening project homepages,
    instead of the OS default browser.

  * `HOMEBREW_BUILD_FROM_SOURCE`:
    If set, instructs Homebrew to compile from source even when a formula
    provides a bottle. This environment variable is intended for use by
    Homebrew developers. Please do not file issues if you encounter errors when
    using this environment variable.

  * `HOMEBREW_CACHE`:
    If set, instructs Homebrew to use the given directory as the download cache.

    *Default:* `~/Library/Caches/Homebrew` if it exists; otherwise,
    `/Library/Caches/Homebrew`.

  * `HOMEBREW_CURL_VERBOSE`:
    If set, Homebrew will pass `--verbose` when invoking `curl`(1).

  * `HOMEBREW_DEBUG`:
    If set, any commands that can emit debugging information will do so.

  * `HOMEBREW_DEBUG_INSTALL`:
    When `brew install -d` or `brew install -i` drops into a shell,
    `HOMEBREW_DEBUG_INSTALL` will be set to the name of the formula being
    brewed.

  * `HOMEBREW_DEBUG_PREFIX`:
    When `brew install -d` or `brew install -i` drops into a shell,
    `HOMEBREW_DEBUG_PREFIX` will be set to the target prefix in the Cellar
    of the formula being brewed.

  * `HOMEBREW_DEVELOPER`:
    If set, Homebrew will print warnings that are only relevant to Homebrew
    developers (active or budding).

  * `HOMEBREW_EDITOR`:
    If set, Homebrew will use this editor when editing a single formula, or
    several formulae in the same directory.

    *Note:* `brew edit` will open all of Homebrew as discontinuous files and
    directories. TextMate can handle this correctly in project mode, but many
    editors will do strange things in this case.

  * `HOMEBREW_GITHUB_API_TOKEN`:
    A personal access token for the GitHub API, which you can create at
    <https://github.com/settings/tokens>. If set, GitHub will allow you a
    greater number of API requests. See
    <https://developer.github.com/v3/#rate-limiting> for more information.
    Homebrew uses the GitHub API for features such as `brew search`.

    *Note:* Homebrew doesn't require permissions for any of the scopes.

  * `HOMEBREW_LOGS`:
    If set, Homebrew will use the given directory to store log files.

  * `HOMEBREW_MAKE_JOBS`:
    If set, instructs Homebrew to use the value of `HOMEBREW_MAKE_JOBS` as
    the number of parallel jobs to run when building with `make`(1).

    *Default:* the number of available CPU cores.

  * `HOMEBREW_NO_ANALYTICS`:
    If set, Homebrew will not send analytics. See: <https://github.com/Homebrew/brew/blob/master/share/doc/homebrew/Analytics.md#analytics>

    *Note:* Homebrew currently disables analytics by default.

  * `HOMEBREW_NO_EMOJI`:
    If set, Homebrew will not print the `HOMEBREW_INSTALL_BADGE` on a
    successful build.

    *Note:* Homebrew will only try to print emoji on Lion or newer.

  * `HOMEBREW_NO_INSECURE_REDIRECT`:
    If set, Homebrew will not permit redirects from secure HTTPS
    to insecure HTTP.

    While ensuring your downloads are fully secure, this is likely
    to cause from-source Sourceforge & GNOME based formulae
    to fail to download.

    Apache formulae are currently unaffected by this variable and
    can redirect to plaintext.

  * `HOMEBREW_NO_GITHUB_API`:
    If set, Homebrew will not use the GitHub API for e.g searches or
    fetching relevant issues on a failed install.

  * `HOMEBREW_INSTALL_BADGE`:
    Text printed before the installation summary of each successful build.
    Defaults to the beer emoji.

  * `HOMEBREW_SVN`:
    When exporting from Subversion, Homebrew will use `HOMEBREW_SVN` if set,
    a Homebrew-built Subversion if installed, or the system-provided binary.

    Set this to force Homebrew to use a particular `svn` binary.

  * `HOMEBREW_TEMP`:
    If set, instructs Homebrew to use `HOMEBREW_TEMP` as the temporary directory
    for building packages. This may be needed if your system temp directory and
    Homebrew Prefix are on different volumes, as OS X has trouble moving
    symlinks across volumes when the target does not yet exist.

    This issue typically occurs when using FileVault or custom SSD
    configurations.

  * `HOMEBREW_VERBOSE`:
    If set, Homebrew always assumes `--verbose` when running commands.

  * `VISUAL`:
    If set, and `HOMEBREW_EDITOR` is not, use `VISUAL` as the text editor.

## USING HOMEBREW BEHIND A PROXY

Homebrew uses several commands for downloading files (e.g. `curl`, `git`, `svn`).
Many of these tools can download via a proxy. It's common for these tools
to read proxy parameters from environment variables.

For the majority of cases setting `http_proxy` is enough. You can set this in
your shell profile, or you can use it before a brew command:

    http_proxy=http://<host>:<port> brew install foo

If your proxy requires authentication:

    http_proxy=http://<user>:<password>@<host>:<port> brew install foo

## SEE ALSO

Homebrew Documentation: <https://github.com/Homebrew/brew/blob/master/share/doc/homebrew/>

`git`(1), `git-log`(1)

## AUTHORS

Homebrew's current maintainers are Misty De Meo, Andrew Janke, Xu Cheng, Mike McQuaid, Baptiste Fontaine, Brett Koonce, Martin Afanasjew, Dominyk Tiller, Tim Smith and Alex Dunn.

Former maintainers with significant contributions include Jack Nagel, Adam Vandenberg and Homebrew's creator: Max Howell.

## BUGS

See our issues on GitHub:

 * Homebrew/brew <https://github.com/Homebrew/brew/issues>

 * Homebrew/homebrew-core <https://github.com/Homebrew/homebrew-core/issues>