#!/bin/bash

#check if xdotool is installed
if [ ! -n "$(dpkg -s xdotool 2>/dev/null | grep 'Status: install ok installed')" ]; then
    echo -e "The package 'xdotool' must to be installed before to run $(basename $0)\nUse 'sudo apt-get install xdotool' command in terminal to install it."
    exit
fi

delay=5 #change as you wish

echo "Press Ctrl+C to finish"

#start with workspace 0 (top left)
xdotool key Ctrl+Alt+Left
xdotool key Ctrl+Alt+Up

#switch workspaces
while : ; do
    workspace_nr=0
    until [ $workspace_nr = 4 ]; do
        sleep $delay
        case $workspace_nr in
            0) xdotool key Ctrl+Alt+Right ;;
            1) xdotool key Ctrl+Alt+Down ;;
            2) xdotool key Ctrl+Alt+Left ;;
            3) xdotool key Ctrl+Alt+Up ;;
        esac
        ((workspace_nr++))
    done
done