Practical Linux Tutorials and Command-Line Guides

Search hundreds of step-by-step tutorials for Bash, Ubuntu, networking, security, and more.

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Using the rsync command to sync files and directories in Linux

Oct 8, 2026 • 10 min read

Rsync Command in Linux with Examples

Use rsync to sync files and directories locally or over SSH. Covers common options, dry runs, exclusions, mirroring, and troubleshooting.

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.

Sep 26, 2026 • 10 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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Oct 8, 2026 • 10 min read

Rsync Command in Linux with Examples

Use rsync to sync files and directories locally or over SSH. Covers common options, dry runs, exclusions, mirroring, and troubleshooting.

Oct 8, 2026 • 13 min read

How to Build Docker Images with Dockerfile

Write a Dockerfile, build an image with docker build, and run it as a container. Includes an Ubuntu 26.04 example, the -f option, .dockerignore, and multi-stage builds.

Dockerfile example used to build a Docker image on Ubuntu

Oct 8, 2026 • 7 min read

How to Flush DNS Cache on Linux, Windows, macOS, and Chrome

Commands to flush the DNS cache on Linux (systemd-resolved, dnsmasq, nscd), Windows, and macOS, plus how to clear the Chrome and Firefox DNS cache.

Flushing the DNS cache on Linux, Windows, and macOS

Oct 8, 2026 • 11 min read

find Command in Linux: Search Files and Directories

The find command searches for files and directories by name, type, size, date, permissions, and more. This guide covers practical examples including wildcards, exec actions, and combining find with grep.

Using the find command to search for files and directories in Linux

Oct 7, 2026 • 10 min read • new • series

Bash Pattern Matching: =~ Operator and Regular Expressions

Match strings in Bash with globs, extglob, and the =~ regex operator. Use anchors, quoting, and BASH_REMATCH to test input and capture groups.

Bash terminal with the =~ operator, a *.log pattern, and a matching server.log filename

Oct 7, 2026 • 6 min read

unlink Command in Linux: Remove a Single File

Remove one file or symlink with unlink. See how it differs from rm, how hard links affect deletion, and how to fix common errors.

Using the Linux unlink command to remove a file from the command line

Oct 7, 2026 • 9 min read

How to Extract (Unzip) tar.gz Files in Linux

Extract (untar) tar.gz and tgz archives with the tar command. Covers extracting to a directory, pulling specific files, wildcards, stdin piping, and listing archive contents.

Extracting tar.gz files in Linux with the tar command

Oct 6, 2026 • 5 min read

How to Convert Integer into String in Python

Convert an int to a str in Python with str(), f-strings, and format(), add leading zeros, build binary or hex strings, and join a list of numbers.

Oct 6, 2026 • 5 min read

How to Convert Strings to Integers in Python

Convert strings to integers in Python with int(), handle invalid input, remove separators, and parse binary, octal, and hexadecimal values.

Oct 6, 2026 • 14 min read • new

How to Resize and Extend a Linux Partition and Filesystem

Extend a Linux partition and grow ext4, XFS, Btrfs, or LVM storage after a disk resize, with layout checks, safe ext4 shrink steps, and troubleshooting.