./t-rex: not found

[EatDun]

Whenever I load the miner from the terminal in Linux it gives me this message. I was following along with a video and it shows loading it from the terminal using the sudo command as the last step, where after it simply starts running. Mine does not however as it gives said message instead. I have never used Linux before so I'm not sure what I could be doing wrong. Any help is much appreciated thank you.