A workable rvm_each

rvm_each.rb

#!/bin/sh

USAGE="Usage: $0 [gemset] command [args]"

# No args?:
if [ "$#" == "0" ]; then
	echo "$USAGE"
	exit 1
fi

# gemset passed?:
gemset=`echo "$1" | grep -E '^@'`
if [ $? == 0 ]; then
  shift
fi

rubies=$(rvm list strings)

for r in $rubies; do
  command="rvm $r$gemset exec $@"
  echo "\n\n$command:"; eval $command;
done