Well, this is a pretty quick tip but if you can memorize this one you'll be happy in the terminal.
Let's say you want to copy the output of a command to your clipboard. What do you do? Use
For example, I just needed to add my public SSH key to my Digital Ocean account.
cat ~/.ssh/id_rsa.pub | xclip -sel clip
That's it, now you can
ctrl + v your SSH key. WIN!
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