ruby-env.sh

#!/usr/bin/env bash

# put this in /usr/bin/ruby-env and do not forget to chmod +x it
# then jsut shebang: #!/usr/bin/ruby-env 1.9.3

export HOME="${HOME%%+(\/)}" # Remove trailing slashes if they exist on HOME

if (( ${rvm_ignore_rvmrc:=0} == 0 ))
then
  for rvmrc in /etc/rvmrc "$HOME/.rvmrc"
  do
    if [[ -f "$rvmrc" ]]
    then
      if \grep '^\s*rvm .*$' "$rvmrc" >/dev/null 2>&1
      then
        printf "%b" "\nError: $rvmrc is for rvm settings only.\nrvm CLI may NOT be called from within $rvmrc. \nSkipping the loading of $rvmrc"
        return 1
      else
        source "$rvmrc"
      fi
    fi
  done
fi

export rvm_path
if [[ -z "${rvm_path:-}" ]]
then
  if (( UID == 0 )) && [[ -d "/usr/local/rvm" ]]
  then rvm_path="/usr/local/rvm"
  elif [[ -d "${HOME}/.rvm" ]]
  then rvm_path="${HOME}/.rvm"
  elif [[ -d "/usr/local/rvm" ]]
  then rvm_path="/usr/local/rvm"
  else echo "Can't find rvm install!" 1>&2 ; exit 1
  fi
fi

true ${rvm_scripts_path:="$rvm_path/scripts"}

__rvm_shell_lookup_script()
{
  local relative_scripts_dir
  relative_scripts_dir="$(dirname -- "$(dirname -- "$0")")/scripts" #"
  for directory in "$rvm_scripts_path" "$HOME/.rvm/scripts" "/usr/local/rvm/scripts" "$relative_scripts_dir"; do
    if [[ -d "$directory" && -s "$directory/rvm" ]]; then
      echo "$directory/rvm"
      return
    fi
  done
}

if [[ -n "$1" && ! -f "$1" && -n "$(echo "$1" | \grep -v '^-')" ]]; then
  rvm_shell_ruby_string="$1"
  shift
fi

rvm_shell_rvm_path="$(__rvm_shell_lookup_script)"
if [[ -n "$rvm_shell_rvm_path" ]]; then
  source "$rvm_shell_rvm_path"
  # Setup as expected.
  if [[ -n "$rvm_shell_ruby_string" ]]; then
      rvm "$rvm_shell_ruby_string"
      if [[ "$?" -gt 0 ]]; then
        echo "Error: RVM was unable to use '$rvm_shell_ruby_string'" 1>&2
        exit 1
      fi
  else
    rvm rvmrc load >/dev/null 2>&1
  fi
fi

exec ruby "$@"

test.rb

#!/usr/bin/ruby-env 1.9.3

puts '  RUBY_VERSION=  ' + RUBY_VERSION.inspect