Debtar script

This is my debtar script:

#!/bin/bash

if [ $# -lt 2 ]; then
        echo "Usage $0 name version [ srcdirname ]"
        exit 1
fi

name=$1
version=$2 

if [ $# -eq 2 ]; then
        srcdirname=$name
else
        srcdirname=$3
fi

tar zcvf ${name}_$version.orig.tar.gz \
                        --transform "s/^$srcdirname/$name-$version/" \
                        --exclude "$srcdirname/debian" \
                        --exclude "$srcdirname/.git" \
                        $srcdirname