From Learn PowerShell in a Month of Lunches, 4th Edition by Travis Plunk, James Petty, Tyler Leonhardt, Don Jones, Jeffery Hicks
From Learn Linux in a Month of Lunches by Steven Ovadia
Linux software installation, removal, and updating is handled by package managers. A package manager is what operates between us, the users, and the distribution software repositories. It’s where you look for software to install. The package manager is also what keeps software up-to-date on your computer.