Tutorials for Developers & Sysadmins
Step-by-step guides for the work we actually do — Laravel, PHP, WordPress, MySQL, Linux servers, and the occasional rabbit hole. Every command has been run on a real machine; nothing is theoretical.
Conditional Rendering with React.createElement
Conditionally render React.createElement components inline with the && short-circuit pattern. The !! falsy-value gotcha and the JSX equivalent.
How to Access aaPanel with a Domain and Let’s Encrypt SSL
Set up aaPanel with a domain and Let's Encrypt SSL — fix Chrome's panel block, plus the symlink trick that…
How to Zip Multiple Files and Directories on Linux
Zip multiple files and directories on Linux with the zip command. Recursion (-r), exclusions (-x), compression level (-0..-9), and when…
How to Check if a JavaScript String Contains a Unicode Character
JavaScript check Unicode character with a regex (/[^\u0000-\u00ff]/), codePointAt for per-character checks, and \p{Emoji} property escape for emoji.
How to List Network Devices on Linux
List network devices on Linux with ip a (every interface), ip -br link (compact), nmcli dev status (NetworkManager view), or…
Fix Nginx ‘recv() failed (104: Connection reset by peer)’ with FastCGI
Fix Nginx 'recv() failed (104: Connection reset by peer)' with FastCGI. Memory, timeouts, worker recycling — the seven PHP-FPM settings…
How to Format a Number with Decimals in JavaScript
JavaScript format number with decimals using toFixed, Math.floor for truncation, or Intl.NumberFormat for locale-aware display with thousands separators.
How to Check if Pure-FTPd Is Installed on Linux
Check if Pure-FTPd is installed on Linux. rpm -qa for AlmaLinux/Rocky/RHEL, dpkg -l for Debian/Ubuntu, plus systemctl to verify the…
How to Check if a JavaScript String Is a Valid URL
JavaScript check valid URL using the built-in URL constructor — cleaner than regex, follows the WHATWG spec, filters out mailto/javascript…
How to Add a User to Pure-FTPd from the Command Line on Linux
Add a user to Pure-FTPd from the CLI on AlmaLinux, Debian or Ubuntu — fix the 'must give non-root uid…