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# Check ruby version
$ ruby -v

# Check gem environment
$ gem environment

# List all gems
$ gem list

# Update gems
$ sudo gem update

# Install a prerelease gem
$ gem install compass --pre

# Gem install/unstall version
$ gem uninstall sass --version 3.3.0.rc.3
$ gem install sass --version 3.2.13

# Gem cleanup
# http://nathanhoad.net/how-to-clean-up-old-gems
#
$ gem cleanup
# dryrun
$ gem cleanup -d
# clean 1 gem
$ gem cleanup GEMNAME

# Bunbler
$ gem update bundler