miscutils/rr

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#!/bin/sh
[ $# -eq 1 ] && echo "usage: $0 command ..." && exit 64
tmp1=$(mktemp $0.XXXXXXXXXX)
tmp2=$(mktemp $0.XXXXXXXXXX)
trap "rm $tmp1 $tmp2; exit 0" 1 2 15
while "$@" >$tmp2
do
if ! diff $tmp1 $tmp2
then
cp $tmp2 $tmp1
else
echo -n "."
fi
sleep 2
done
rm $tmp1 $tmp2