1 Typographical Conventions

This document uses the following typographical conventions:

A single key.

A single key, for instance the key marked "A", is written as a if it is pressed without the shift key, A if it is pressed with the shift key. The following special key names are used in the LUX Manual:

Return

The key marked "Return" or "Enter", which signals completion of the input.

SPC

The "space" bar, which generates a single whitespace.

TAB

The key marked "Tab", which advances the cursor to the next tab position.

Backspace

The key marked "Backspace", which rubs out the character before the cursor, and moves all text below and after the cursor back by one position.

Delete

The key marked "Del" or "Delete", which rubs out the character under the cursor, and moves all text after the cursor back by one position.

ESC

The key marked "Esc" or "Escape", which is used as introduction to multi-key editor sequences.

Downarrow

The down-arrow key.

Uparrow

The up-arrow key.

Rightarrow

The right-arrow key.

Leftarrow

The left-arrow key.

Insert

The key marked "Insert", which toggles between insert and overwrite mode.

Most keys change their meaning when they are typed while the key marked "Control" or "Ctrl" is being kept pressed down. Such an occurrence is described in this manual by prepending C- to the name of the key being pressed while the "Control" key is also pressed. For instance, pressing the "Control" key, pressing the x key, releasing the x key, and releasing the "Control" key generates a key sequence written as C-x in this manual. Such a control sequence counts as a single keystroke.

A sequence of keystrokes.

A sequence of keystrokes that you type at the keyboard, for instance a t followed by a comma (,), two whitespaces (SPC), and a 6, is indicated like this: t, 6.

A meta-variable name.

The name of a meta-variable in LUX, for instance the one that stands for a general expression, is indicated as follows: expr.

Some LUX code.

Some arbitrary (legal) LUX code is written as follows: T,6. Only uppercase letters are used in names of functions and routines and in reserved LUX key words. The example code used for illustration here would follow from the example used for the sequence of keystrokes, above.