CIDR and Subnetting Explained with Examples
CIDR notation, subnet masks, the block-size trick, VLSM and supernetting, worked with real ipcalc, sipcalc, Python and ip route output on Ubuntu 24.04 and RHEL 9.
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98 tutorials, newest first · page 3 of 10
Basic Bash Commands for Scripting
A practical tour of the Bash commands scripts actually use: echo, printf and read for I/O, path tools, safe file commands, and ways to inspect data, with real terminal output from Ubuntu and RHEL.
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Bash Environment Variables and .bashrc vs .bash_profile
Bash environment variables explained with real output: PATH, HOME, USER, SHELL, LANG, TERM, local vs exported variables, and which startup file Bash reads.
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AWS VPC Explained: The Complete Guide to Amazon VPC
What an AWS VPC is made of: CIDR blocks, public and private subnets, route tables, internet and NAT gateways, security groups vs NACLs, endpoints, peering and what it all costs, with real CLI output.
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Your First Bash Script: Shebang, Shell Types and Limits
Write and run your first Bash script, pick the right shebang (#!/bin/bash vs env), understand login and interactive shells, and know when to switch languages.
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What Is Shell Scripting in Linux? Shells Explained
What shell scripting is and how it runs on Linux, shell vs terminal, Bash vs sh vs zsh vs ksh vs fish, and why sysadmins and DevOps use it. Real output.
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Linux Server Hardening Checklist for Ubuntu and RHEL
A hands-on Linux server hardening checklist for Ubuntu 24.04 and RHEL 10: SSH, sudo, firewall, sysctl, auditd, AIDE and CIS scans, with real output.
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journalctl: The Commands You’ll Actually Use
The journalctl commands worth knowing: filter by unit, time and priority, follow logs live, and why your logs vanish after a reboot.
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Linux find Command: 30 Practical Examples
Thirty find command examples for Linux: search by name, size, time and permissions, run actions with exec, and delete files without wrecking things.
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50 Essential Linux Commands Every Beginner Should Know
Fifty Linux commands grouped by task, with real terminal output, the ten to learn first, and the ones that can ruin your day.
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