ruby gem uninstall
The command is simply: gem uninstall <gem-name>
# for a general uninstall
NOTE: maybe you need sudo, depens on your user rights. like so
sudo gem uninstall <gem-name>
# remove all old versions of the gem
gem cleanup <gem-name>
# choose which ones you want to remove
gem uninstall <gem-name>
# remove version 1.1.9 only
gem uninstall <gem-name> --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall <gem-name> --version '<1.3.4'
# remove ALL INSTALLED Gems (and starting over)
gem uninstall -aIx
Options
-a, --[no-]all Uninstall all matching versions
-I, --[no-]ignore-dependencies Ignore dependency requirements while
uninstalling
-x, --[no-]executables Uninstall applicable executables without
confirmation