Best way to choose a random file from a directory in a shell script

Question

What is the best way to choose a random file from a directory in a shell script?

Here is my solution in Bash but I would be very interested for a more portable (non-

Answer 1

Is "shuf" not portable?

shuf -n1 -e /path/to/files/*

or find if files are deeper than one directory:

find /path/to/files/ -type f | shuf -n1

it's part of coreutils but you'll need 6.4 or newer to get it... so RH/CentOS does not include it.