linux-notes

Linux notes and cheatsheets written from a security perspective.
Not just how things work — but what attackers look for and what defenders should check.

Utkarsh Solanki — Cybersecurity & AI Student
LinkedIn · GitHub

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Contents

File	Topics
01-File-Permissions.md	chmod, chown, octal values, SUID, SGID, sticky bit, umask, hardening rules
02-Users-and-Groups.md	/etc/passwd, /etc/shadow, useradd, usermod, sudo, sudoers, privesc checklist
03-Common-Commands.md	Navigation, file ops, grep, find, process management, networking, logs, redirection
04-Bash-One-Liners.md	Recon, enumeration, log analysis, network one-liners, text processing, useful aliases

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Roadmap

This repo is actively growing. Planned additions:

• 05-Bash-Scripting.md — variables, loops, conditionals, functions, script structure
• 06-Cron-and-Scheduling.md — crontab syntax, security risks, hardening
• 07-Service-Management.md — systemctl, journalctl, writing service units
• 08-Network-Configuration.md — interfaces, routing, iptables basics
• 09-Log-Analysis.md — auth.log, syslog, journald, pattern hunting

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Related Repos

Repo	What's inside
networking-and-os	TCP/IP, DNS, HTTP, Subnetting, Wireshark, tcpdump, OS basics
cybersecurity-notes	CIA triad, Zero Trust, Cryptography, Threats, Risk Management

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Last updated: June 2026