random.sh

#!/bin/bash
rand () 
{ 
    RANGE=$1;
    number=$RANDOM;
    let "number %= $RANGE";
    let "number = $number + 1"
}
PICRANGE=$(ls pics/* 2>/dev/null | wc -l)
QUOTERANGE=$(ls quotes/* 2>/dev/null | wc -l)
if [ $PICRANGE -lt 1 ]; then
        2>&1 echo "no pictures found"
        exit 1
fi
if [ $QUOTERANGE -lt 1 ]; then
        2>&1 echo "no quotes found"
        exit 1
fi
PICNUM=$(rand $PICRANGE)
QUOTENUM=$(rand $QUOTERANGE)
PIC=$(ls pics/* | head -${PICNUM} | tail -1)
QUOTE=$(ls quotes/* | head -${QUOTENUM} | tail -1)
width=$(identify -format %w ${PIC})
let "width = $width - 10"
if [ -n "$1" ]; then
        OUTPUT=$1
else
        OUTPUT=random.gif
fi
convert ${PIC} -gravity center -background white -alpha remove -size ${width}x caption:@${QUOTE} -append $OUTPUT