Resize window to specific settings

[endorama]

source: https://superuser.com/a/153337/118214

solution

Relying on wmctrl (resize window to 90% of it's original size)

#!/bin/sh

set -- $(xwininfo -root| awk -F '[ :]+' '/ (Width|Height):/ { print $3 }')
width=$1
height=$2

wmctrl -r :ACTIVE: -e 0,-1,-1,$((width*90/100)),$((height*90/100))