#!/bin/sh
#
PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/sbin:/usr/local/bin'

num="$1"
if test -z "$num" ; then
    echo "Usage: $(basename $0) <number of characters>" 1>&2
    exit 100
fi

echo $(dd bs=1024 count=1 if=/dev/urandom 2> /dev/null | tr -dc '[:print:]' | sed "s:'\|\"::g" | head -c "$num")