Hiding windows in X11

#Map these to keyboard shortcuts to hide and show windows with the commands. hidewindow.sh hides the currently focused window, and showwindow.sh unhides the most recently hidden windows in reverse order.
#Requires xdotool

#hidewindow.sh
#! /bin/sh
xdotool windowunmap `xdotool getwindowfocus | tee -a $HOME/hidden`

#showwindow.sh
#! /bin/bash
export WINDOWID=`awk '/./{line=$0} END{print line}' $HOME/hidden`
if [[ -n "$WINDOWID" ]]; then
  xdotool windowmap $WINDOWID
  sed -i '/'${WINDOWID}'/d' $HOME/hidden
  export WINDOWID=
else
  echo "No hidden (unmapped) windows found in '$HOME/hidden'."
fi