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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Use SCP Command to Securely Transfer Files

Sep 23, 2026 • 10 min read

scp Command in Linux: Secure File Transfer Examples

SCP copies files securely between local and remote hosts over SSH. This guide covers syntax, uploads, downloads, custom ports, and the options you need for everyday transfers.

Aug 4, 2026 • 7 min read

Linux Folder Size: How to Check File and Directory Sizes

Check folder and file sizes in Linux with du. Compare directory totals, rank subdirectories, exclude paths, and check free space with df.

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.

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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.

Oct 30, 2026 • 15 min read • series

SSH Tunnel: Local, Remote, and Dynamic Port Forwarding

Set up SSH tunnels with the -L, -R, and -D options for local, remote, and dynamic port forwarding, with working examples for Linux, macOS, and Windows.

Oct 30, 2026 • 12 min read

How to Mount a Windows Share on Linux Using CIFS

Mount a Windows SMB share on Linux with CIFS, use a credentials file, set ownership and permissions, and create a reliable fstab entry.

Oct 30, 2026 • 9 min read • new

How to Install PostgreSQL on Debian 13

Install PostgreSQL 17 on Debian 13, create an application role and database, and configure password authentication and remote access.

Cartoon elephant above the title PostgreSQL on Debian 13 on a light background with small geometric shapes

Oct 30, 2026 • 12 min read

ln Command in Linux: Create Symbolic Links

The ln command creates symbolic links on Linux, giving you a stable name that points to a moving target. This guide covers creating, updating, and cleaning up symlinks, plus safe symlink updates for deployments.

ln command in Linux for creating symbolic links

Oct 29, 2026 • 10 min read • new

bc Command in Linux: Command-Line Calculator

Use bc for arbitrary-precision math on the Linux command line, with examples covering scale, functions, base conversion, and use inside shell scripts.

bc calculator showing decimal division with scale set to four places

Oct 29, 2026 • 7 min read

type Command in Linux: Show Command Type and Location

Check how Bash resolves a name with type: alias, function, builtin, keyword, or file on disk. Covers -t, -a, -p, -P, and where Zsh and dash differ.

Using the type command to show how the shell resolves a command name

Oct 29, 2026 • 10 min read

pushd and popd Commands in Linux: Navigate Directories with a Stack

Save directories to a stack with pushd, return with popd, and jump between them in Bash. Covers dirs, stack rotation, ~N shortcuts, quiet use in scripts, and common errors.