#!/bin/ksh
#
# dvonik's random file grabber
# 
# in public domain
#

# randomise files
randomise() {
    count=1
    
    for i in $(find "$1" 2> "/dev/null"); do
        arr[$count]="$i"
        count="$(( count + 1 ))"
    done

    size="${#arr[@]}"
    index="$(( RANDOM % size ))"
    echo "${arr[$index]}"
}

[ ! -e "$1" ] && {
    echo "$0: $1: no such file or directory" > "/dev/stderr"
    exit 1
}

randomise "$1"