How-to's

This page collects many common tasks on Linux systems. They are not strictly limited to Linux security. Most are also useful for system administration, auditing, and pentesting. Something missing? Send us your feedback.

How-to categories

Accounts
Cryptography
Data
Date and Time
File system
Firewalls
Internet
Network
Processes
Security frameworks

Available how-to's

Accounts

Lock a user account

Cryptography

Data

Date and Time

Convert numeric date to human-readable format

File system

Firewalls

Allow SSH access for one IP address with UFW

Internet

See the owner of a domain name

Network

Processes

Security frameworks

See if AppArmor is enabled