Expand tabs into 4 spaces

exptabs

#!/bin/bash
if [ $# -lt 1 ]; then
    find . -type f \( -name '*.xml' -o -name '*.php' -o -name '*.css' -o -name '*.html' -o -name '*.js' \) -exec sh -c 'expand -t 4 "$1" > _tmp_ && mv _tmp_ "$1"' - {} \;;
    if [ $? == 0 ]; then
        echo "Expanded tabs in `pwd`";
    fi
else
    for arg
    do
        find $arg -type f \( -name '*.xml' -o -name '*.php' -o -name '*.css' -o -name '*.html' -o -name '*.js' \) -exec sh -c 'expand -t 4 "$1" > _tmp_ && mv _tmp_ $1' - {} \;;
        
        if [ $? == 0 ]; then
            echo "Expanded tabs in `pwd`/$arg";
        fi
    done
fi