Enhanced the dscussion of font conventions.

man7/man-pages.7

@@ -393,6 +393,8 @@ where the rest of the function is specified in bold:
 .PP
 .BI "    int myfunction(int " argc ", char **" argv );
 .PP
+Variable names should, like argument names, be specified in italics.
+.PP
 Filenames (whether pathnames, or references to files in the
 .I /usr/include
 directory)
@@ -415,6 +417,28 @@ usually uses the
 .B \&.TP
 macro).
 .PP
+Complete commands should, if long,
+be written as in an indented line on their own, for example
+.in +4n
+.nf
+
+man 7 man-pages
+
+.fi
+.in
+If the comamnd is short, then it can be included inline in the text,
+in italic format, for example,
+.IR "man 7 man-pages" .
+In this case, it may be worth using non-breaking spaces
+("\e\ ") at suitable places in the command.
+Command options should be written in italics, e.g.,
+.IR \-l .
+.PP
+Expressions, if not written on a separate indented line, should
+be specified in italics.
+Again, the use of non-breaking spaces may be appropriate
+if the expression is inlined with normal text.
+.PP
 Any reference to the subject of the current manual page
 should be written with the name in bold.
 If the subject is a function (i.e., this is a Section 2 or 3 page),