incremental steps i3wm window move command

i3-move

#!/bin/sh

verse=$1
stu=20
tapf=/tmp/i3-tap
stepf=/tmp/i3-step
verf=/tmp/i3-verse
if [ ! -f $tapf ] ; then
    echo `date +%s` > $tapf
fi
if [ ! -f $verf ] ; then
    echo $verse > $verf
    lverse=$verse
else
    lverse=`cat $verf`
    echo $verse > $verf
fi

last=`cat $tapf`
current=`date +%s`

if [ ! -f $stepf ] ; then
    echo $stu > $stepf
    step=$stu
else
    cstep=`cat $stepf`
    step=$(( cstep + $stu )) > $stepf
fi
if [ "$verse" = "$lverse" -a $(( current - last )) -lt 2 ] ; then
    i3-msg move $verse $step
    echo $step > $stepf
else
    i3-msg move $verse $stu
    echo $stu > $stepf
fi
echo $current > $tapf