Diff continuously over du output

du-diff.sh

#/bin/bash
#
# Usage: du-diff.sh DU_ARGS

PREVIOUS=$(mktemp -t du-diff.prev.XXXXX.txt)
CURRENT=$(mktemp -t du-diff.curr.XXXXX.txt)

echo prev: $PREVIOUS current: $CURRENT > /dev/stderr

INTERVAL=${DU_DIFF_INTERVAL:-1}

while true; do
    du $@ > $CURRENT

    tput home
    tput clear

    if test -n "$(cat $PREVIOUS)"; then
        diff $PREVIOUS $CURRENT
    else
        cat $CURRENT
    fi

    cat $CURRENT > $PREVIOUS

    sleep $INTERVAL
done