History command

Every time you run a command, it's memorized in the history.

You can display all the history using:

history

This shows the history with numbers:

Screen-Shot-2020-09-04-at-08.03.10

You can use the syntax !<command number> to repeat a command stored in the history. In the above example typing !121 will repeat the ls -al | wc -l command.

Typically the last 500 commands are stored in the history.

You can combine this with grep to find a command you ran:

history | grep docker

To clear the history, run history -c.