screenshot.sh

#!/bin/bash
#
# How to use:
#
# Bring up your terminal emulator (xterm) and type
#
# sleep 3; ./screenshot.sh
#
# You have three seconds to get the cursor ready. The cursor will be captured and whatever window you click on is captured.
#
name=`date +%F-%T | sed -e 's/:/-/g'`
name+=".png"
import -window `xwininfo | awk '/Window id/{print $4; exit}'` "$name"