libinput-gestures workspace switch using 3 fingers

workspace.sh

#!/bin/sh

# libinput-gestures workspace helper
# Then add the commands in Gesture interface

# Left
# /home/username/workspace.sh -1
# Right
# /home/username/workspace.sh 1
# Up
# /home/username/workspace.sh -3
# Down
# /home/username/workspace.sh 3

wmctrl -d | grep \* | cut -c1 | xargs -I{} expr {} + $1 | xargs wmctrl -s

Using libinput-gestures to change Ubuntu workspaces using 3 fingers. It's useful for a 3x3 workspace, using wmctrl.