X11 / Linux hide titlebar of a window

hidetitlebar

#!/bin/bash

# Hide the decorations of a window.
# Defaults to hiding the focused window's decorations.
# Pass -m to use the mouse to select the target window.

# Get the focused window's ID
ID_OPTION="-id $(xdotool getwindowfocus)"

while getopts 'm' flag; do
    case "${flag}" in
        # Passing no ID defaults to using mouse selection
        m) ID_OPTION="" ;;
    esac
done

xprop $ID_OPTION -format _MOTIF_WM_HINTS 32i -set _MOTIF_WM_HINTS 2