libchecksum

function checksum() {
DIST=$(uname)

case $DIST in
  Darwin)
    md5 $1 | tr -d " " | awk -F= {'print $2'}
    ;;
  Linux)
    md5sum $1 | awk '{ print $1 }'
   ;;
  *)
    echo "Unsupported distro $DIST"
    exit 1
  ;;
esac
}

export -f checksum