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Reading some lines from a file in terminal

At work, I am often asked to find commands that meet specific needs. One of them recurs: how to make selections of lines in a file? The question is very simple, some of you have got the answer. But when you’re not a “frequent terminal user” you can realize that it’s not as simple. There are 4 commands to use: head: get firsts lines of a file tail: get last lines of a file cat: get the whole content of a file sed: to manipulate specific lines “head” and “tail” commands have got an option to get a specific number of lines: “-n”