Hide window title bar by name in X11.

hide_window_titlebar.sh

#!/bin/bash                                                                                           
# regex for extracting hex id's                                                                       
grep_id='0[xX][a-zA-Z0-9]\{7\}'

xprop -spy -root _NET_ACTIVE_WINDOW | grep --line-buffered -o $grep_id |
while read -r id; do
    win_title="`xprop -id $id | awk '/_NET_WM_NAME/ {print $3$4$5; exit;}' `"
    if [ -n "$id" ] && [ -n "$win_title" ]; then
        if [[ $win_title =~ "Kate" ]]; then
            xprop -id $id -f _MOTIF_WM_HINTS 32c -set _MOTIF_WM_HINTS "0x2, 0x0, 0x0, 0x0, 0x0"
        fi
        if [[ $win_title =~ "REAPER" ]]; then                                                         
            xprop -id $id -f _MOTIF_WM_HINTS 32c -set _MOTIF_WM_HINTS "0x2, 0x0, 0x0, 0x0, 0x0"
        fi
    fi
done