kshutils/rr

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function rr
{
(( $# == 0 )) && print "usage: $0 command ..." && return 64
typeset tmp1=$(mktemp $0.XXXXXXXXXX)
typeset tmp2=$(mktemp $0.XXXXXXXXXX)
trap "rm $tmp1 $tmp2; exit 0" 0 1 2 15
while eval "$@" >$tmp2
do
if ! diff $tmp1 $tmp2
then
cp $tmp2 $tmp1
else
print -n "."
fi
sleep 2
done
print
rm $tmp1 $tmp2
}