Got bored, have never found something like xkill that I can just say, “xkill somewindowname”. Found xwininfo last week, thought about this hehe:
#!/bin/sh
#
# kill X client by window name
#
if [ -n "$1" ]; then
xwininfo -name "$1" | grep 'Window id:' | awk '{ print $4 }' |
head -n 1 | xargs xkill -id
else
echo "usage: `basename $0` windowname"
fi
xkillname xconsole and poof – the xconsole window is killed, hehe.