Practical Linux Tutorials and Command-Line Guides

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Bash case statement syntax and pattern matching examples

Jul 1, 2026 • 6 min read

Bash case Statement: Match Patterns in Shell Scripts

The Bash case statement matches a value against a list of patterns and runs the corresponding block. This guide explains argument parsing, syntax, glob patterns, multiple matches, and fall-through behavior.

May 1, 2026 • 7 min read

Netcat (nc) Command in Linux with Examples

Use the Netcat nc command in Linux to scan ports, listen for connections, transfer files, test TCP and UDP services, and set connection timeouts.

Mar 11, 2026 • 8 min read

Using the SSH Config File

Set up the SSH client config file to manage multiple remote connections with custom hostnames, users, ports, keys, and jump hosts — all without long command-line flags.

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Aug 9, 2026 • 8 min read • series

Bash until Loop

Repeat commands until a condition becomes true with the Bash until loop. Includes syntax, practical examples, and comparisons with the while loop.

Aug 8, 2026 • 12 min read • series

Linux File Permissions Explained

Linux file permissions control who can read, write, and execute files and directories. Learn how to inspect and change permissions with ls, stat, and chmod.

Blue folder holding documents, titled Linux File Permissions

Aug 8, 2026 • 7 min read

How to Show Line Numbers in Vim and Vi

Turn on line numbers in Vim or Vi for the current session, set them by default in .vimrc or init.lua, and switch between absolute, relative, and hybrid numbering.

Aug 7, 2026 • 8 min read • series

Chmod Recursive: Change File Permissions Recursively in Linux

Use chmod -R to change permissions recursively in Linux. This guide covers numeric and symbolic modes, examples using find, common patterns, and safety tips.

Aug 7, 2026 • 11 min read • series

chmod 777: What It Means and Why You Should Never Use It

chmod 777 grants every user full control of a file or directory. See why it is risky and when to use safer 755 or 644 permissions instead.

The word chmod above three colored sevens, one each for owner, group, and others

Aug 6, 2026 • 16 min read • series

chmod Command in Linux: Change File and Directory Permissions

The chmod command changes file and directory permissions in Linux. This guide covers what chmod 755, 644, 700, and 600 mean, how to use symbolic and numeric modes, and how to apply permissions recursively.