a.rb

  --login                      Authenticate gist on this computer.
    -f, --filename [NAME.EXTENSION]  Sets the filename and syntax type.
    -t, --type [EXTENSION]           Sets the file extension and syntax type.
    -p, --private                    Makes your gist private.
        --no-private
    -d, --description DESCRIPTION    Adds a description to your gist.
    -s, --shorten                    Shorten the gist URL using git.io.
    -u, --update [ URL | ID ]        Update an existing gist.
    -a, --anonymous                  Create an anonymous gist.
    -c, --copy                       Copy the resulting URL to the clipboard
    -e, --embed                      Copy the embed code for the gist to the clipboard
    -o, --open                       Open the resulting URL in a browser
        --no-open
    -P, --paste                      Paste from the clipboard to gist
    -R, --raw                        Raw url of the new gist
    -l, --list [USER]                List all gists for user