#!/bin/sh

# This simply makes a backup of a file as filename.bak

if [[ -n "$1" ]];
then
	cp "$1"{,.bak}
fi

if [ $# -ge 1 ]; then
    for f in $@
    do
        [ -n "$f" ] &&cp "$f"{,.bak}
    done
else
    echo "No filenames passed."
fi