Command Line

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


  • curl Video — 00:11:11
    • Basic curl usage and common use cases.

  • OpenSSL Video — 00:09:08
    • Basic OpenSSL usage and common use cases.

  • grep and egrep Video — 00:08:02
    • Basic grep and egrep usage and common use cases.

  • awk Video — 00:09:53
    • Basic awk usage and common use cases.

  • jq Video — 00:08:04
    • Basic jq usage and common use cases.

  • cut Video — 00:06:09
    • Basic cut usage and common use cases.

  • sort Video — 00:08:08
    • Basic sort usage and common use cases.

  • Summarizing Events Video — 00:20:03
    • Basic event summarization from the web server logs.

  • ss and netstat Video — 00:06:01
    • Basic ss and netstat usage and common use cases.

  • tcpdump Video — 00:10:12
    • Basic tcpdump usage and common use cases.

  • Video — 00:07:02
    • Basic usage and common use cases.

  • base64 Video — 00:07:39
    • Basic base64 usage and common use cases.

  • hexdump and xxd Video — 00:03:56
    • Basic hexdump and xxd usage and common use cases.

  • gzip Video — 00:13:18
    • Basic gzip usage and common use cases.

  • CyberChef Video — 00:09:50
    • Basic CyberChef usage and common use cases.


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.

Meet the author

Manuel earned a bachelor’s degree in Business Administration and Computer Systems Engineering at the Universidad Autonoma de Nuevo Leon in Mexico and a Master of Sciences in Information Security Engineering with focus on Incident Response at the SANS Technology Institute. He holds around 40 cybersecurity-related certifications.

He started working full-time in the information security field in early 2000. Since 2012, Manuel has worked as a security expert, including supporting over a thousand WAFs to protect a variety of web applications. Starting in 2016, Manuel committed part of his personal time to improve the OWASP ModSecurity Core Rule Set, becoming an active rule developer. Since then he has contributed numerous new rules, fixed false positives and false negatives and assisted with many other improvements.

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

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We use Infosec Skills to provide continuous training to our technicians and to prepare them for various certifications. Infosec Skills allows us to create personalized training programs that focus on each of our technicians’ particular roles and see their progress as they take courses. We also, recommend it to clients to make their IT support teams better.

Caleb Yankus


This has been utilized to bridge the skills gap across our cyber team and to aid them as they prepare for their various certifications. It also has provided a nice learning foundation for our various cyber team members to utilize as we continue to find ways for cross-utilization with operations while minimizing the downtime needed to ensure everyone’s knowledge is the same.

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