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