The official of GPG keys of MySQL are expired so the new installations and upgrades from the official package repository are failed with the following message.

notify.js is a small jQuery plugin that simplifies notification process. Despite its small size it is fully customizable notification library.

HTTP Live Streaming or HLS Player is a media streaming protocol that deliver content to the users according to their bandwidth availability. The basic building blocks of a HLS streams are M3U8 playlists.

Code Snippet to traverse a folder and calculate hash of each file. Seven type of hashing algorithm are available including MD5 and SHA. It can also traverse recursively with Recurse switch.

Variable is a symbolic name or reference to an information. They provide a way of labeling data with a descriptive name and provide a way to manipulate information. In Rust, to declare a variable, you use a "let" statement.