Unusual linux commands can be very handy in several cases. Here are some of them.
Repeat the last typed command:
Display file-content like cat, but from upside down, can be achieved with tac (reverse cat)
Like to lookup in a dictionary file? Use look. Everything whats starts with the passed word will be shown.
Display time / date in bash screen on right upper corner. Continously!
while sleep 1;do tput sc;tput cup 0 $(($(tput cols)-29));date;tput rc;done &
Show all buildin commands
Show all commands you can run