Two years ago, Sequent Microsystems introduced a stackable 8-Relay board enabling up to 64 relays to be connected to a single Raspberry Pi board. The 8-relay board only supported 24V/2.5A, and the company is now back on Kickstarter with a 4-relay board with 250V/10A line-switching relays that can offer up to 32 relays by stacking 8 boards connected to one Raspberry Pi board via the 40-pin I/O header.
Source: Connect up to 32 Relays to Raspberry Pi with a Stackable 4-Relay Board (Crowdfunding) (CNX Software – Embedded Systems News)
Also: Stackable Raspberry Pi add-on has four switched relays (LinuxGizmos)
This brief tutorial describes how to easily fix broken Ubuntu OS without losing data or without reinstalling it completely.
Source: How To Fix Broken Ubuntu OS Without Reinstalling It – OSTechNix
In this tutorial, we learn Linux cut command with some practical examples you can use to cut parts and sections from each line of a file and write the result to standard output.
Source: Linux Cut Command with Practical Examples (LinOxide)
To get printing up and working on your Raspberry Pi the first thing you need to do is install CUPS. CUPS is an open source printing system developed by Apple that uses the Internet Printing Protocol (IPP) to support printing to both local and network printers.
Source: Printing at home from your Raspberry Pi (Raspberry Pi Blog)
Looking for a classic start menu in Ubuntu 20.04 Gnome Shell? Arc-menu is a traditional modern application menu for GNOME.
Source: How to Get Classic Start Menu in Ubuntu 20.04 LTS | UbuntuHandbook
Prefer single bottom panel to the default Gnome desktop panels? You can get a Windows or KDE Plasma like panel by Gnome Shell extension Dash to Panel.
Source: How to Enable Single Bottom Panel in Ubuntu 20.04 LTS – Tips on Ubuntu
This post includes SCP examples. SCP or secure copy allows secure transferring of files between a local host and a remote host or between two remote hosts. It uses the same authentication and security as the Secure Shell (SSH) protocol from which it is based. SCP is loved for it’s simplicity, security and pre-installed availability.
Source: SCP Linux – Securely Copy Files Using SCP examples (Hayden James)
You can even run 64-bit Ubuntu on your Raspberry Pi.
Source: How to Install Ubuntu on Your Raspberry Pi | Tom’s Hardware