args="$@"
length=$(($#-1))
files=${@:1:$length}
filename=${@: -1}


if [ -f $filename ]; then
   echo "Output $filename already exists."
else
   montage -label "\n%t" -pointsize 14 -tile 3x6 -geometry 550 -geometry +25+15 -border 1 $files $filename
fi