cat /proc/sys/kernel/random/uuid
https://coderwall.com/p/t_sz3q/generate-uuid-at-shell-prompt
uuidgen
alias uuid="python -c 'import sys,uuid; sys.stdout.write(uuid.uuid4().hex)' | pbcopy && pbpaste && echo"
alias uuid="python -c 'import sys,uuid; sys.stdout.write(uuid.uuid4().hex)' | pbcopy && pbpaste && echo"