spm

Don't use shift at all

Both available commands (insert and show) only accept a single argument
so handling the command line arguments this way is easier and more
foolproof. This fixes issue #5.

diff --git a/tpm b/tpm
@@ -106,12 +106,9 @@ if [ $# -gt 2 ]; then
   abort "tpm doesn't accept more than two arguments"
 fi
 
-cmd="${1}"
-shift
-
-case "${cmd}" in
-  "show")   show   "${@}" ;;
-  "insert") insert "${@}" ;;
+case "${1}" in
+  "show")   show   "${2}" ;;
+  "insert") insert "${2}" ;;
   *) abort "USAGE: tpm COMMAND ENTRY" ;;
 esac