PROOF(9.1) PROOF(9.1) NAME proof - troff output interpreter for 5620 SYNOPSIS proof [ -ffonts ] [ file ] DESCRIPTION Proof reads troff(1) intermediate language from file or standard input and simulates the resulting pages on the screen. If no file name is given and standard input is a terminal, proof terminates immediately leaving a `proof layer'. By invoking proof in a proof layer you can avoid download time. Fonts are loaded as required. The usual mux(9.1) font, defont, is used for unknown fonts. Option -f preloads fonts. Names are given relative to and are separated by commas. The most-used fonts are `-fR.10,I.10,B.10,S.10'. After a layer's worth of text is displayed, proof pauses for a command from keyboard or mouse button 3. The typed ver- sions of commands are: newline Go on to next portion of text. (Button 3 equiva- lent: `more'.) q Quit, leaving a proof layer. x Exit and restart the regular terminal program. (Equivalent to `q' followed by `term mux'; see term(9.1)). pn Print page n. An out-of-bounds page number means the end nearer to that number; a missing number means page 0; a signed number means an offset to the cur- rent page. Button 1 gets a scroll box, which represents a full page of text. An interior rectangle shows what part of the page is now visible. The interior rectangle moves with the mouse, causing the layer to scroll both vertically and horizon- tally. Button 2 gets a speedometer. The bar of the speedometer moves with the mouse to control the rate at which new information is displayed. EXAMPLES troff -ms memo | proof Format a memo and display it. (eqn memo | troff -ms) 2>diags | proof PROOF(9.1) PROOF(9.1) Display a memo with equations. Avoid sending diagnos- tics to the screen; see BUGS. FILES fonts list of referenced but unconverted fonts SEE ALSO lp(1), font(6), reader(9.7), psi(9.1) Brian W. Kernighan, A Typesetter-independent Troff BUGS Proof breaks if other messages are directed to its layer. In particular, unredirected troff diagnostics will break the pipeline `troff | proof'. Windowing can get confused if the troff output is not approximately sorted in ascending y-order. A proof layer imitates `term 33', not mux. Among other dif- ficulties, it will not be reusable if downloaded across the network.