Insert version number before the file extension

versions.sh

#!/bin/bash

if [[ $# -eq 0 ]] ; then
    echo "Please enter the version number";
    exit 0;
fi

echo "using version number:" $1;
shopt -s globstar;
rename "s/\..*\./\./" **;
rename "s/\.*\./\.$1\./" **;
mv "index.$1.html" "index.html";
mv "script.$1.sh" "script.sh";

Requires >bash 4.0, rename (a perl script) and globstar support