sysadmin

How to Determine the SMTP and IMAP Servers for a Domain

Learn how to identify your domain's SMTP and IMAP server settings using MX records, naming patterns, and auto-configuration tools.

How to Determine the Email Server (MX Records) for a Domain

Learn how to find the Mail Exchange (MX) records for any domain using tools like nslookup, dig, and online services for troubleshooting email delivery or understanding email server setups.

How to Set max_input_vars in PHP: A Quick Guide for Developers

Learn how to set PHP's max_input_vars using php.ini, .htaccess, or .user.ini. Fix `Too many input variables` errors and optimize form handling with this quick guide.

Synchronize Files Preserving Remote Ownership and Permissions with rsync

Learn how to use rsync to synchronize local and remote files without altering ownership and permissions on the remote server, ensuring consistent file management across systems.

Find Lines in One File Not Present in Another Using `grep`

Learn how to use the powerful `grep` command in Unix/Linux to compare text files and identify lines unique to one file. Simplify file comparison with this quick and flexible technique.

Open Applications in Fullscreen on Ubuntu

Learn how to make Ubuntu applications launch in fullscreen by modifying desktop files and application settings with this short step-by-step guide.

Manage Long-Running Tasks with Screen on a Remote Linux Server

A brief step-by-step guide on using screen to manage long-running tasks on remote servers efficiently.

How to Prevent SSH Timeout on Linux Systems

Prevent SSH timeouts on your Linux machine with a simple configuration change. Follow our quick guide to keep your SSH connection active during periods of inactivity.

Understanding the Bash Fork Bomb: A Breakdown of :(){ :|:& };:

Explore the mechanics of the infamous Bash fork bomb, a destructive code snippet that can potentially crash Unix-like systems by rapidly consuming resources through exponential process replication.

50 Must-Know Bash Commands for Linux & Unix Sysadmins

Boost your Linux system administration skills with this guide to 50 essential Bash commands. Organized by topic, learn file management, system monitoring, user permissions, and network tasks.

How to Examine a Remote Linux Server via SSH: A Sysadmin's Guide.

A brief guide for system administrators to examine and troubleshoot a remote Linux server via SSH.