Convenient script to uninstall all global installed gems (..when using rbenv).

uninstall_gems.sh

#!/usr/bin/env bash

uninstall() {
  list=`gem list --no-versions`
  for gem in $list; do
    gem uninstall $gem -aIx
  done
  gem list
  gem install bundler
}

# rbenv versions --bare
RBENVPATH=`rbenv root`
echo $RBENVPATH
RUBIES=`ls $RBENVPATH/versions`
for ruby in $RUBIES; do
  echo "---------------------------------------"
  echo $ruby
  rbenv local $ruby
  uninstall
done