.TH TROFF 7
.SH NAME
troff \- addenda to troff manual
.SH DESCRIPTION
These addenda apply to the reference.
.PP
New requests; none cause breaks:
.HP
\&.ab \fIt\fR	print text
.I t
on standard error and stop
.PD0
.HP
\&.cf \fIf\fR	copy file
.I f
into troff output uninterpreted;
assume net motion is 0
.HP
\&.sy \fIc\fR	execute unix comand
.I c
.HP
\&.pi \fIc\fR	pipe output of
.I troff
through command
.I c
.PD
.PP
Deleted request:
.HP 
\&.li
.PP
New escape sequences
.TP
\eD\'l \fIdh dv\fR\'
draw line
.I dh
horizontally and
.I dv
vertically
.PD0
.TP
\eD\'\fIc d\fR\'
draw circle with diameter
.I d
extending right from current position
.TP
\eD\'e \fIh v\fR\' draw ellipse with axis
.I h
extending right from current position and vertical axis
.I v
.TP
\eD\'a \fIdh1 dv1 dh2 dv2\fR\'
arc counterclockwise from here, centered at 
.I dh1,dv1
to
.I dh1+dh2,dv1+dv2
.TP
\eD\'\(ap \fIdh1 dv1 dh2 dv2\fR ...\' quadratic spline
.TP
.RI \eg r " or \eg(" rr
format of number register
.IR r
or
.IR rr ;
empty if not defined
.TP
\eH\'\f2n\fP\'
character height of present font is
.I n
points, width unchanged; 
.IR n =0
for present point size; 
.RI + n
increments;
.RI \- n
decrements
.TP
\eS\'\f2n\fP\'
slant output
.I n
degrees;
.I n
may be negative
.PD
.PP
New number registers:
.HP
$$	process id of
.IR troff ;
read only
.PD0
.HP
\&.L	line spacing (.ls); read only
.HP
\&.P	1 if page is being printed; 0 if suppressed by -o; read only
.HP
\&.R	number of unused number registers
.HP
\&.b	emboldening factor (.bd)
.HP
\&.j	.ad setting, usable as argument to .ad
.HP
\&.k	horizontal size of text (excluding indent) of current partial output line
.HP
\&c.	input line-number, counting from 1 in each file;
same as .c, but writable
.HP
\&.T	troff output device name (a string: \e*(.T)
.PD
.PP
Number register deleted:
.PP
hp
.SH SEE ALSO
J. F. Ossanna,
.I NROFF/TROFF Reference Manual
.br
troff(1)