Fast way to empty global gemset

rvm-empty-gems.sh

#!/bin/bash -e

#
# This script will empty all RVM default gemsets in parallel.
#
rubies=($(rvm list strings))

echo "Emptying default gemsets for rubies: ${rubies[*]}";

for ruby in "${rubies[@]}"
do
  ( 
    rvm use $ruby; 
    rvm --force gemset empty;
  )&
done
wait