How do you see command line history in UNIX?

Question

Write a unix command to display the every character in the word "QUERYHOME" in new line.

Ex : Input - QUERYHOME
output: Q
U
E
R
Y
H
O
M
E

Answer 1

Very useful indeed, use history command along with grep command in UNIX to find any relevant command you have already executed.

Example

$ history

Output
911  man  7 signal
912  man ps
913  man  7 signal
914  man killall
915  killall -l
916  man killall
917  su -

$ history | grep killall

Output
914  man killall
915  killall -l
916  man killall