Day 3: Linux command line

Most servers and security tools run on Linux. Today you practice the command line, file permissions, and log locations that analysts use during investigations and hardening reviews.

Today's outcome: You can navigate Linux, read logs, and understand permissions — essential for SOC and hardening work.

Start: Linux essentials for…Full week plan

Week progress

Day 3 of 7

1
Security mindset & threat basics
2
Networking for security
3
Linux command line
You are here
4
Web security introduction
5
SOC & log awareness
6
First hands-on lab
7
Pick your career direction

Goals

Learning objectives

By the end of today you should be able to:

Navigate directories and manage files from the terminal
Interpret file permissions (chmod) and ownership (chown)
Locate and skim authentication logs (e.g. auth.log patterns)
Complete at least one hands-on checklist task from the tutorial

Schedule

Suggested schedule

Adjust timing to your pace — aim for one focused block per day.

Tutorial~40 min
Follow Linux basics for cybersecurity — commands, users, permissions, logs.
Lab prep~15 min
Set up a Linux VM or use the platform lab environment if available.
Practice~15 min
Run ls -la, cat a log snippet, and change permissions on a test file.
Notes~10 min
Document five commands you will use again this week.