Display Linux/Mac OS Distribution Logo in ASCII Art in Terminal

There are 2 tools which are commonly used to display Linux distribution Logo in the Linux Terminal.

• Neofetch

• Screenfetch

The main purpose of these tools is to be used in screenshots to show other users what OS/distribution you're running as well as the themes and icons you're using.
These tools also display a lot more than just the logo. They provide the following information about your system.

• System Model

• Screen Resolution

• Linux Kernel Version

• Desktop Environment

• Uptime

• Windows Manager

• Packages

• Themes and Icons

• Shell Version

• Terminal Tool in use

• CPU, GPU and RAM information

Most Linux distributions are covered here, in case yours is not please feel free to visit their Wiki page
NEOFETCH
It is a command-line system information tool written in BASH that displays information about your system next to an image, your OS logo or any ASCII file of your choice.
This tool can also be used in Linux, MacOS,iOS, Android, Haiku, GNU Hurd, MINIX, Windows(Cygwin/Windows 10 Linux subsystem) and BSD systems.
Neofetch is highly customizable through the use of command-line flags or the user config file. There are over 50 config options and there's also a print_info() function and friends which let you add your own custom information. Visit their wiki page for more information.
Installing NeoFetch.
To install NeoFetch in Debian, Ubuntu and other Ubuntu-based Linux distros such as Elementary OS, Linux Mint, Zorin OS etc. Use the following command

 sudo apt install neofetch  

You can use this ppa if you're using Ubuntu 16.04 and below or if the above command didn't work for your Linux version
Add ppa

 sudo add-apt-repository ppa:dawidd0811/neofetch  

Update repositories

 sudo apt update  

Install the package

 sudo apt install neofetch  

MacOS(Homebrew)

 brew install neofetch  

Fedora/RHEL/CentOS/Mageia
Neofetch is in Fedora's official repositories starting from Fedora 27.

 sudo dnf install neofetch  

Alternatively, you can use a third-party repo: NOTE: If you are using RHEL/CentOS, change dnf into yum.
Enable COPR repository

 sudo dnf copr enable konimex/neofetch  

Install the package

 sudo dnf install neofetch  

Alternatively:
If you're using RHEL/CentOS make sure you have installed epel-release
Fetch the repo file

 curl -o /etc/yum.repos.d/konimex-neofetch-epel-7.repo https://copr.fedorainfracloud.org/coprs/konimex/neofetch/repo/epel-7/konimex-neofetch-epel-7.repo  

NOTE: If you're using Fedora change epel-7 to fedora-23 or your Fedora version respectively. However, if you're using RHEL/CentOS 6, change it to epel-6.
Install the package

 sudo dnf install neofetch  

iOS/iPadOS
Add this repo to your package manager eg Cydia

 https://repo.packix.com/  

Install Neofetch-iOS from your package manager.
For other Linux distributions check the installation instructions on the NeoFetch GitHub page.
To launch and use Neofetch, just type neofetch in the terminal and it will display the Linux logo of your OS in ASCII form along with your system information.
SCREENFETCH
Use the following command

 sudo apt-get install screenfetch  

For Ubuntu based distributions you will need to add a ppa. Type the following command in your terminal.

 sudo apt-add-repository ppa:djcj/screenfetch  

Update your repositories

 sudo apt-get update  

Install the package

 apt-get install screenfetch  

For Arch-based distributions such as Manjaro use the following command

 sudo pacman -S screenfetch  

Fedora-based distributions use the following command

 sudo dnf install screenfetch  

To launch screenfetch, use the following command
screenfetch
Let me know in the comments below which one is your favourite.