The command line format for using the man macros with
groff -m man [ -rLL=length ] [ -rLT=length ] [ -rFT=dist ] [ -rcR=1 ] [ -rC1 ] [ -rD1 ] [-rHY=flags ] [ -rPnnn ] [ -rSxx ] [ -rXnnn ] [ -rIN=length ] [ -rSN=length ] [ files... ]
It is possible to use ‘-man’ instead of ‘-m man’.
-rcR=0to disable it.
 Note that the use of a ‘.ll
length’ request to initialize the line length, prior to use of the
‘TH’ macro, is supported for backward compatibility with some
versions of the
man program. Always use the
-rLL=length option, or an equivalent ‘.nr LL
length’ request, in preference to such a ‘.ll length’
request. In particular, note that in nroff mode, the request ‘.ll
65n’, (with any length expression which evaluates equal to
65n, i.e., the formatter's default line length in nroff mode),
does not set the line length to 65n (it is adjusted to the
man macro package's default setting of 78n), whereas the
use of the -rLL=65n option, or the ‘.nr LL 65n’ request
does establish a line length of 65n.