#als bash !!!
LAND=`basename $0 | sed 's/\.txt//'`
cd $HOME/gpxtracks; gpsbabel -i gpx `ls {TH,VN,KH,SG,MY,LK,MM,LA}.gpx 2> /dev/null|awk '{print " -f "$1}'` -x simplify,error=.33k -o gpx -F - | egrep -v -e '<time>.*</time>|<desc>.*</desc>' > $HOME/gpxtracks/$LAND.gpx