multi-env rake command for rails projects

gistfile1.sh

#!/bin/bash
#
# For example, you're deep in prototyping mode, and want to keep your test 
# and development environments in sync. Don't keep typing:
#   rake RAILS_ENV=test db:migrate && rake RAILS_ENV=development db:migrate
# instead:
#   rakes -dt db:migrate
# 
# don't repeat yourself.

while getopts 'dtsp' OPTION
do
  case $OPTION in
  d) denv="development"
    ;;
  t) tenv="test"
    ;;
  s) senv="staging"
    ;;
  p) penv="production"
    ;;
  h|?)
    printf "Run rake on multiple RAILS_ENVs.\n\n" >&2
    printf "Usage: %s [-dtsp] tasks\n" $(basename $0) >&2
    printf "\t-h\tShow this help screen and exit\n" >&2
    printf "\t-d\tdevelopment\n" >&2
    printf "\t-t\ttest\n" >&2
    printf "\t-s\tstaging\n" >&2
    printf "\t-p\tproduction\n" >&2
    exit 2
    ;;
  esac
done
shift $(($OPTIND - 1))

for renv in "$denv" "$tenv" "$senv" "$penv"; do
  if [ -n "$renv" ]; then
    echo "Running rake tasks [$@] on $renv"
    rake RAILS_ENV=$renv $@
  fi
done