Proof
reads
troff(1)
intermediate language from
file
or standard input
and simulates the resulting pages on the screen.
After a page of text is displayed,
proof
pauses for a command from the keyboard.
The typed commands are:
- newline
- Go on to next page of text.
- -
- Go back to the previous page.
- q
- Quit.
- pn
- Print page
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.
- n
- Same as
pn.
- c
- Clear the screen, then wait for another command.
- mmag
- Change the magnification at which the output is printed.
Normally it is printed with magnification .9;
mag=.5
shrinks it to half size;
mag=2
doubles the size.
- xval
- Move everything
val
screen pixels to the right (left, if
val
is negative).
- yval
- Move everything
val
screen pixels down (up, if
val
is negative).
- /nview
- Split the window into
nview
pieces. The current page goes into the rightmost, bottommost piece,
and previous pages are shown in the other pieces.
- -F dir
- Use
dir
for fonts instead of
/lib/font/bit.
- d
- Toggle the debug flag.
These commands are also available, under slightly different form,
from a menu on button 3. The
pan
menu item allows arbitrary positioning of the page:
after selecting
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.
The
m,
x,
y,
F,
/,
and
d
commands are also available as command line options.