Module 4 cheat sheet: Linux & Web Servers

Move around Linux, manage files safely, and publish a website on EC2 with Apache or IIS.

All modules 📖 Glossary

Navigation

Command	Does
whoami / pwd	who and where am I
cd /path · cd .. · cd - · cd ~	move around
ls -a · ll	list, incl. hidden / long
sudo -i · exit	become root · go back
history · clear	past commands · clear screen

Files and folders

Command	Does
mkdir -p a/b	create folders
touch f	empty file
cat f · cat > f · cat >> f	view · overwrite · append
cp -r · mv	copy · move/rename
rmdir · rm -rf	delete empty · delete all (careful!)

Editors

	vi	nano
Start typing	i	just type
Save & quit	Esc → :wq	Ctrl+X → Y → Enter
Quit, no save	Esc → :q!	Ctrl+X → N

Directory tree

Path	Meaning
/	root directory (top)
/root	root user’s home
~	current user’s home
/var/www/html	Apache website
/var/log	logs

Code: Apache on Ubuntu

sudo -i
apt update -y && apt install apache2 -y
systemctl enable --now apache2
echo "<h1>Hello from EC2</h1>" > /var/www/html/index.html

Common mistakes

Port 80 not open in the security group.
Skipping apt update before installing.
Saving index.html.txt on Windows.
Running rm -rf without checking pwd.

Created by Ajeetkumar · EasyLearnSpace