Uninstall all gems from all Ruby versions managed by rbenv

uninstall_gems.sh

#!/usr/bin/env bash

# Uninstall all gems from all Ruby versions managed by rbenv

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

ruby_versions=$(rbenv versions --bare)
for version in $ruby_versions; do
  echo '---------------------------------------'
  echo $version
  rbenv local $version
  uninstall_gems
done