collate.sh

#!/bin/bash

counter=0
files=(*)
count=${#files[@]}
dir=0
for file in *
do
	echo "File: `printf %03d $counter`-$file"

	if [[ "$1" == "--apply" ]]
	then
		mv $file "`printf %03d $counter`-$file"

	fi

    if [[ "$dir" == 0 ]]
    then
        counter=$((counter+2))
    else
        counter=$((counter-2))
    fi

	if [[ "$((counter+1))" -gt "$((count))" ]]
	then
		counter=$((counter-1))
		dir=1
	fi
done