ref: a291bbdeddfd41a2f0907ecbd7b819f0eedffdaf
dir: /sys/man/1/proof/
.TH PROOF 1 .SH NAME proof \- troff output interpreter .SH SYNOPSIS .B proof [ .BI -m mag ] [ .BI -/ nview ] [ .B -F .I dir ] [ .B -d ] [ .I file ] .SH DESCRIPTION .I Proof reads .IR troff (1) intermediate language from .I file or standard input and simulates the resulting pages on the screen. .PP After a page of text is displayed, .I proof pauses for a command from the keyboard. The typed commands are: .TP \w'newline\ \ \ 'u newline Go on to next page of text. .TP .B - Go back to the previous page. .TP .B q Quit. .TP .BI p n Print page .IR n . An out-of-bounds page number means the end nearer to that number; a missing number means the current page; a signed number means an offset to the current page. .TP .I n Same as .BI p n\f1. .TP .B c Clear the screen, then wait for another command. .TP .BI m mag Change the magnification at which the output is printed. Normally it is printed with magnification .9; .IR mag "=.5" shrinks it to half size; .IR mag "=2" doubles the size. .TP .BI x val Move everything .I val screen pixels to the right (left, if .I val is negative). .TP .BI y val Move everything .I val screen pixels down (up, if .I val is negative). .TP .BI / nview Split the window into .I nview pieces. The current page goes into the rightmost, bottommost piece, and previous pages are shown in the other pieces. .TP .BI "-F " dir Use .I dir for fonts instead of .BR /lib/font/bit . .TP .B d Toggle the debug flag. .PD .PP These commands are also available, under slightly different form, from a menu on button 3. The .B pan menu item allows arbitrary positioning of the page: after selecting .BR pan , press the mouse button again and hold it down while moving the page to the desired location. The page will be redisplayed in its entirety when the button is released. Mouse button 1 also pans, without the need for selecting from a menu. .PP The .BR m , .BR x , .BR y , .BR F , .BR / , and .B d commands are also available as command line options. .SH FILES .TF \fL/lib/font/bit/MAP .TP .B /lib/font/bit/* fonts .TP .B /lib/font/bit/MAP how to convert troff output fonts and character names into screen fonts and character numbers .SH SOURCE .B /sys/src/cmd/proof .SH SEE ALSO .IR lp (1), .IR gs (1), .IR page (1) .br J. F. Ossanna and B. W. Kernighan, ``Troff User's Manual''