cat /etc/passwd | grep root | awk -F: '{print $3}' ruby -e 'puts File.read("/etc/passwd").lines.select { |line| line.match(/root/) }.first.split(":")[2]'
https://alvinalexander.com/scala/fp-book/how-functional-prog...
https://alvinalexander.com/scala/fp-book/how-functional-prog...