Get 6 2" x 2" passport photos on a 4x6

passport.sh

#!/bin/bash
# Create a 4x6 photo from one square image

if [ $# -ne 1 ]; then
    echo "usage: ./passport.sh <filename>"
    exit 1
fi

FN="$1"
montage "$FN" -clone 0,0,0,0,0 -geometry +0+0 -tile 3x2 "${FN%.*}-4x6.jpeg"