timestamp.sh

#!/bin/bash
if [ $# -eq 0 ]
  then
    echo "Please supply the name of the gem to timestamp"
    exit
fi

file=`ls -t $1-*.gem`

new_file="${file//gem/$(date +"%Y%m%d%H%M%S").gem}"

echo "Renaming $file to $new_file"

mv $file $new_file