← It has big text! ↑ And a gradient!
gem help install
Usage: gem install GEMNAME [options]

  Options:
    -v, --version VERSION            Specify version of gem to install
    -l, --local                      Restrict operations to the LOCAL domain (default)
    -r, --remote                     Restrict operations to the REMOTE domain
    -b, --both                       Allow LOCAL and REMOTE operations
    -i, --install-dir DIR
    -d, --[no-]rdoc                  Generate RDoc documentation for the gem on install
    -f, --[no-]force                 Force gem to install, bypassing dependency checks
    -t, --[no-]test                  Run unit tests prior to installation
    -w, --[no-]wrappers              Use bin wrappers for executables
                                     Not available on dosish platforms
    -P, --trust-policy POLICY        Specify gem trust policy.
        --ignore-dependencies        Do not install any required dependent gems
    -y, --include-dependencies       Unconditionally install the required dependent gems

  Common Options:
        --source URL                 Use URL as the remote source for gems
    -p, --[no-]http-proxy [URL]      Use HTTP proxy for remote operations
    -h, --help                       Get help on this command
        --config-file FILE           Use this config file instead of default
        --backtrace                  Show stack backtrace on errors
        --debug                      Turn on Ruby debugging

  Arguments:
    GEMNAME   name of gem to install

  Summary:
    Install a gem into the local repository

  Defaults:
    --both --version '> 0' --rdoc --no-force --no-test
    --install-dir /usr/local/lib/ruby/gems/1.8