scripts/db in rvm-0.1.32 vs scripts/db in rvm-0.1.33

@@ -1,20 +1,27 @@
 #!/usr/bin/env bash
 
+usage() {
+  printf "\nUsage:\n" >&2
+  printf "\n  $rvm_scripts_path/db database_file {{key}} {{value}} # set" >&2
+  printf "\n  $rvm_scripts_path/db database_file {{key}} # get" >&2
+  printf "\n  $rvm_scripts_path/db database_file {{key}} unset # unset\n\n" >&2
+}
+
 if [[ -f "$1" ]] ; then
   database_file="$1" ; shift
   if [[ ! -f "$database_file" ]] ; then
     mkdir -p $(dirname $database_file)
     touch $database_file
   fi
 else
-  echo "Database file $1 does not exist." >&2
+  printf "\n\nDatabase file $1 does not exist.\n\n" >&2
   exit 1
 fi
 
 key="$1" ; shift
 if [[ -z "$key" ]] ; then
-  echo "usage: $0 database key [value]" >&2
+  usage
   exit 1
 else
   value="$*"
   if [[ "unset" = "$value" ]] || [[ "delete" = "$value" ]] ; then
     sed -i.tmp "s#^$key=.*\$##" $database_file