Lesser known but extremely useful unix commands.
View files / display files
If you want to display a big, structured dataset (like a .csv), but
cat is wrapping the text, use less instead.
less -S filename
If you want to scroll right or left, use ESC+) and ESC+(.
Download file from URL
If you want to download a file from a URL (typically to install from zip/tar):
wget -P examples/ www.example.com/image.png
curl -o examples/image.png www.example.com/image.png