Every time we run a command, that’s memorized in the history.

You can display all the history using:

history

This shows the history with numbers:

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

The history command works on Linux, macOS, WSL, and anywhere you have a UNIX environment

Lessons in this unit:

0:	Introduction
1:	su - Switch User
2:	sudo - Superuser Do
3:	passwd - Change Password
4:	ping - Test Network
5:	traceroute - Trace Network Path
6:	▶︎ history - Command History
7:	export - Set Environment Variables
8:	crontab - Schedule Tasks
9:	alias - Create Shortcuts
10:	man - Manual Pages
11:	tar - Archive Files
12:	gzip - Compress Files
13:	gunzip - Decompress Files
14:	basename - Strip Directory
15:	dirname - Extract Directory
16:	nano - Text Editor
17:	vim - Vi Improved Editor
18:	emacs - Text Editor
19:	ed - Line Editor