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Here are some fun Linux terminal utilities to brighten up your command line.

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cmatrix

Displays a scrolling Matrix-style animation in the terminal. 
sudo apt-get install -y cmatrix
cmatrix

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apt-get moo

A fun easter egg that displays a cow saying “have you mooed today”. No installation required. 
apt-get moo

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aafire

Displays a fire animation in the console using ASCII art. 
sudo apt-get install -y libaa-bin
aafire

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sl

Displays an animated walking train — a fun punishment for mistyping ls as sl. 
sudo apt-get install -y sl
sl

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fortune

Displays a random message, joke, or quote. 
sudo apt-get install -y fortune
fortune

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figlet

Displays large ASCII art text from any string you provide. 
sudo apt-get install -y figlet
figlet "Hello World"

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nyancat

Plays an animated Nyan Cat in the terminal. 
sudo apt-get install -y nyancat
nyancat

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