[Tab] -> Command Completion / file filled
[Ctrl] + [C] -> interrupt the current program
[Ctrl] + [D] -> Exit exit
date view the date and time
date +%Y-%m-%d
date +%H:%M
View Calendar cal
cal [month] [year]
bc Calculator
scale = number digits after the decimal point set
quit quit
who / w View online users
sync will sync data in memory is written to disk