This is the command gem2tgz that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
gem2tgz - converts Rubygems' .gem file into tarballs
gem2tgz [OPTIONS] GEMNAME [TARBALL] (to download the gem with gem fetch)
gem2tgz [OPTIONS] GEMFILE [TARBALL] (to use a local .gem file)
gem2tgz will convert the .gem file GEM into a tarball named TARBALL. If TARBALL is
omitted, gem2tgz will try to guess the filename for the tarball by taking GEM and
replacing '.gem' with '.tar.gz'.
Use gem2tgz online using onworks.net services