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cd

An absolute path is the unique path for a specific file/directory. It always starts at root (/).

The path to a file/directory relative to the current working directory. This path always starts from the current working directory sometimes denoted as a . character.

nano is a command line text editor. It allows you to edit the text content of files directly from a terminal.

One way to save a file in nano is to press Ctrl + O to write out the file.

You exit a file in nano by pressing Ctrl + X to exit the file. If changes have been made to the file nano will ask you if you want to write changes before exiting, or to discard changes before exiting.