#!/bin/bash

xwdfile=/tmp/xsnap.xwd
pngfile=xsnap.png

xpid=`pidof X`

authfile=`ps h $xpid | awk '{print $12}'`

export XAUTHORITY=$authfile
export DISPLAY=:0

xwd -root > $xwdfile

# if imagemagick is installed then convert the grab to png
if [ -z "`which convert 2>/dev/null`" ];then
   cp $xwdfile . && echo "file writtem as `basename $xwdfile`"
else
   convert $xwdfile $pngfile && echo "file writtem as $pngfile"
fi

rm -f $xwdfile