Whatever you type at the keyboard is only passed on to LUX’s interpreter when you press the RET key. Before you do that, you can edit the command line in various ways, described below. Most of the editing commands are the same as those in the Emacs editor.
During command line input, the leftmost four columns of the screen are reserved for the display of prompts, which convey information about the status of the input. The rightmost column of the screen is reserved for the continuation character -, which is displayed whenever the input is too long to fit on a single screen line. The columns between the prompt and continuation columns are used to display your input.
On input, any non-printable characters that are not recognized as editing commands (for instance tabs) are treated as whitespace.
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