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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May 1, 2026 • 7 min read

fsck Command in Linux: Check and Repair Filesystems

Use the fsck command in Linux to check and repair filesystems safely, run read-only checks, fix unmounted partitions, and schedule boot-time checks.

Apr 22, 2026 • 6 min read

Ping Command in Linux

The ping command tests network connectivity by sending ICMP packets to a host and reporting latency, TTL, and packet loss.

Mar 17, 2026 • 8 min read

Bash printf Command

A practical guide to printf in Bash: formatting numbers, strings, and alignment.

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A quick weekly roundup of new tutorials, news, and tips.

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Nov 2, 2026 • 7 min read

How to Install Java on Ubuntu 26.04

Install OpenJDK 25, the Ubuntu 26.04 default, or Oracle JDK 25 and 27. Also covers other OpenJDK versions, switching between them, and JAVA_HOME.

Nov 2, 2026 • 8 min read

apt vs apt-get: The Difference and When to Use Each

apt and apt-get are not the same tool: apt is built for interactive terminal use, apt-get for scripts and automation. Compare their commands and see when to use each.

Nov 2, 2026 • 8 min read • new • series

Fix SSH "Too Many Authentication Failures" Error

Fix SSH 'Too many authentication failures' by selecting the right key with IdentitiesOnly, skipping keys for password login, and checking MaxAuthTries.

A mint SSH key selected from several unused keys and pointed toward a server keyhole

Nov 1, 2026 • 4 min read

How to Change a Git Remote's URL

Change a Git remote URL with git remote set-url, switch between HTTPS and SSH, set separate push and fetch URLs, and verify the change.

Nov 1, 2026 • 7 min read

Python Switch Case Statement (match-case)

Learn how to use Python's match-case statement (structural pattern matching) as a switch-case equivalent. Covers if-elif-else, dictionary lookup, and match-case with examples.

Nov 1, 2026 • 6 min read • new

Fix "npm ERR! Missing Script: dev"

npm run dev fails with 'Missing script: dev' when package.json has no dev key. Find the script the project actually uses, or add one that starts its dev server.

A dev command tile being added to an empty row in a package.json scripts card

Nov 1, 2026 • 7 min read

git diff Command: Compare Changes Between Commits and Branches

Use git diff to compare your working directory, staged files, commits, and branches, with practical examples of the options you will use most.

git diff command showing changes between commits in Git

Oct 31, 2026 • 6 min read • new

Fix Nginx "Request Header or Cookie Too Large" Error

Resolve Nginx's 400 Request Header or Cookie Too Large error: clear site cookies, adjust large_client_header_buffers, and check the active configuration.

Oversized cookie request card blocked by a narrow header buffer beside a smaller card passing through a wider buffer

Oct 31, 2026 • 7 min read

jobs Command in Linux: List and Manage Background Jobs

The jobs command lists background and suspended processes in the current shell session. This guide covers syntax, options, job specifications, and practical examples.

Linux jobs command listing background processes

Oct 31, 2026 • 6 min read

How to Check Java Version

Find out which Java version is installed on your system, check the JDK compiler version, and manage multiple Java installations from the command line.