This article describes How To List/Get Debian 9.8.0 Installed Packages

The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian.

An operating system is the set of basic programs and utilities that make your computer run. At the core of an operating system is the kernel. The kernel is the most fundamental program on the computer and does all the basic housekeeping and lets you start other programs.

Debian systems currently use the Linux kernel or the FreeBSD kernel. Linux is a piece of software started by Linus Torvalds and supported by thousands of programmers worldwide. FreeBSD is an operating system including a kernel and other software.

However, work is in progress to provide Debian for other kernels, primarily for the Hurd. The Hurd is a collection of servers that run on top of a microkernel (such as Mach) to implement different features. The Hurd is free software produced by the GNU project.

A large part of the basic tools that fill out the operating system come from the GNU project; hence the names: GNU/Linux, GNU/kFreeBSD, and GNU/Hurd. These tools are also free.

Debian package management consists of several layers. The lowest layers are made up of dpkg and associated programs. On top of these layers is the Apt family of tools such as apt, apt-get, apt-cache, and others. See the Package Management Tools page for a description of other tools for working with DebianPackage files.

The package manager for Debian and its derivatives is apt. APT which stands for Advanced Package Tool is a set of tools for managing Debian packages, and therefore the applications installed on your Debian system. APT makes it possible to:
Install applications
Remove applications
Update applications
Fix broken packages e.t.c

Apt is a command-line interface for the package management system and combines the most commonly used functionalities from apt-get and apt-cache including an option to list installed packages.

To lists all packages installed on your system run the following command:
sudo apt list --installed
sudo apt list --installed | less
sudo apt list --installed | grep tmux

Now you can find some examples in this video.

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