leachryan

# uuidgen generates a UUID, but in capital letters
# The generated UUID is piped into tr which transforms it to lowercase
# The lowercase output is piped into another tr, but this removes any newline characters
# Finally, that output is piped into pbcopy, which copies the UUID to the clipboard

uuidgen | tr "[:upper:]" "[:lower:]" | tr -d '\n' | pbcopy

leachryan

<?php

/**
 * Compute the check digit of a UPC
 *
 * Example : 01595830676
 * Product : 015958306760
 *
 * @param string $upc
 * @return string $upc