Command Line Course

Learn the purpose of some of the basic command-line tools and how to use them.

2 hours, 19 minutes

Course description

This course highlights some of the features on command-line utilities available on most distributions and how to use those tools for testing the web server state, performing transactions, finding and extracting info from the logs, generating basic reports, and if required, decoding the data from various formats. You'll also review some of the CyberChef web application capabilities related to visualizing and decoding data.



Video - 00:10:00

Basic CyberChef usage and common use cases.

Video - 00:13:00

Basic gzip usage and common use cases.
hexdump and xxd

Video - 00:04:00

Basic hexdump and xxd usage and common use cases.

Video - 00:08:00

Basic base64 usage and common use cases.

Video - 00:07:00

Basic usage and common use cases.

Video - 00:10:00

Basic tcpdump usage and common use cases.
ss and netstat

Video - 00:06:00

Basic ss and netstat usage and common use cases.
Summarizing Events

Video - 00:20:00

Basic event summarization from the web server logs.

Video - 00:08:00

Basic sort usage and common use cases.

Video - 00:06:00

Basic cut usage and common use cases.

Video - 00:08:00

Basic jq usage and common use cases.

Video - 00:10:00

Basic awk usage and common use cases.
grep and egrep

Video - 00:08:00

Basic grep and egrep usage and common use cases.

Video - 00:09:00

Basic OpenSSL usage and common use cases.

Video - 00:11:00

Basic curl usage and common use cases.

Meet the author

Manuel Leos Rivas

Manuel Leos Rivas earned a bachelor’s degree in Business Administration and Computer Systems Engineering at the Universidad Autónoma de Nuevo Leon in Mexico and a Master of Science in Information Security Engineering with focus on Incident Response at the SANS Technology Institute. He holds over 50 cybersecurity-related certifications from GIAC, CompTIA, isc2, and AWS, among others.

Manuel has worked in cybersecurity for over 20 years in four different countries. He started his career in IT/Information security in 2000 as Network and Firewall Administrator in Mexico. Later in 2007, he switched to information security as Security Analyst and compliance coordinator.

In 2011, he started working for Gemalto (now Thales DIS). Gemalto relocated Manuel to France as Solution Security Expert and a few years later to Canada to work as Cloud Security Engineer for Gemalto. At Gemalto, Manuel managed ModSecurity Web Applications Firewalls protecting over a thousand websites and applications. He implemented hardening and multiple SIEMs in highly secured environments for large multinational companies in diverse sectors like banking and mobile network operators.

Since 2016, Manuel has committed part of his time to improving the OWASP ModSecurity Core Rule Set as one of the OWASP CRS developers and contributed numerous improvements to the project.

AWS Canada hired Manuel in 2019 as Cloud Security Architect to provide professional services to Public Sector companies, including government, education, health, insurance, and power utilities.

In 2021 Manuel relocated to the United States of America to work for Backblaze as Cloud Security Architect.

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Associated NICE Work Roles

All Infosec training maps directly to the NICE Workforce Framework for Cybersecurity to guide you from beginner to expert across 52 Work Roles.

  • Cyber Operator
  • System Administrator
  • Data Analyst

Plans & pricing

Infosec Skills Personal

$299 / year

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  • 100s of hands-on labs in cloud-hosted cyber ranges
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  • Custom certification practice exams (e.g., CISSP, CISA)
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