random_notes random sleep gnu bash $ sleep $(echo "${RANDOM}" | cut -b 1)s brew install coreutils alias date=gdate alias cut=gcut read -t 10 -p "ENTER to continue" || echo "" time strings bash date "+%Y%m%d_%H%M%S" python time.strftime("%Y%m%d_%H%M%S") -> '20201116_113252'