#!/bin/sh

if [ "$#" -gt 1 ]; then
    echo "Usage: delete_whitespaces <directory>"
    exit 1
fi

if [ "$#" -eq 0 ]; then
    dir="$( pwd )"
else
    dir="$1"
fi

cd "$dir" || { echo "Couldn't cd to directory. Exiting..."; exit 1; }

for file in "$dir"/*; do
    newname="$( echo "$file" | sed 's/[ \t]/\_/g' )"
    mv "$file" "$newname"
done

exit 0