Practical Linux Tutorials and Command-Line Guides
Search hundreds of step-by-step tutorials for Bash, Ubuntu, networking, security, and more.
Featured Articles
Linuxize Weekly Newsletter
A quick weekly roundup of new tutorials, news, and tips.
Latest Articles
chattr Command in Linux: Change File Attributes
The chattr command changes file attributes in Linux. Make a file immutable with chattr +i, keep logs append-only with +a, and check flags with lsattr.
tr Command in Linux: Translate, Delete, and Squeeze Characters
The tr command translates, deletes, and squeezes characters from standard input. This guide covers tr syntax, character sets and ranges, case conversion, removing line endings, and practical pipeline examples.
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.
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.
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.
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.
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.
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.
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.
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.
Series
Cheatsheets
Apache Cheatsheet
Apache HTTP Server at a glance: service commands, file layout on Ubuntu and RHEL, virtual hosts, modules, .htaccess, redirects, TLS, reverse proxy, and log formats.
SSH Config Cheatsheet
SSH client config directives at a glance: Host and Match patterns, keys, jump hosts, keepalives, multiplexing, port forwarding, host key checking, and tokens for ~/.ssh/config.
SQLite Cheatsheet
SQLite command-line reference for opening databases, running SQL, formatting results, importing CSV files, and making backups.
systemd Unit File Cheatsheet
systemd unit file directives at a glance: [Unit] dependencies, service types, Exec commands, restart policy, users and environment, resource limits, hardening, timers, and drop-in overrides.