For me it’s the paranoia surrounding webcams. People outright refuse to own one and I understand, until they go on and on about how they’re being spied. Here’s the secret - unplug the damn thing when you think you won’t use it or haven’t used it in a while.
They, whoever it is, can’t really spy on you on something that’s already off and unplugged!
Awk is a helps you do any kind of processing of semi structured text data.
Sed is a stream editor which lets you edit a file using commands. Which is tedious until you need to replace something in a bunch if files or make very specific edits across a large number of files.
Grep is just find pattern in text file.