How to write man pages - nrof -man
.TH title section date extra2 extra3
.SH $1 (Section Header)
.SS $1 (Subsection)
.BR break line
.P New paragraph (vertical space, point size, font regular, indent)
.LP $1  (labeled paragraph, label $1)
.TP $1 (will be at the left column until next line input's newline.)
       After newline, will be a bit more to the left($1), as in html's <DL>.
       Subsequent .TP, without parameter, will keep the later parameter.
       The .TP indent value is reset after .PP. (?)
.IP $1 (Starts an indented paragraph where "item" is put to the left of it; if
        no blanks in "item", quotes are not needed.)
.HP (Starts a paragraph with a hanging indent; i.e. lines after the first are
        indented)
.RE Defines an indented region
.NF Nofill (used to suppress normal line filling; used for preformatted text)
.FI Fill (used to resume normal line filling, usually after a .nf)
.\" Comment line

.B (bold)
.I (Italic)
.SM (Small)
.SB (Small bold)
.IR $1 $2  (first italic, second regular, ...)
.RI $1 $2  (first regular, second italic, ...)
.IB $1 $2  as above, italic bold.
.BI $1 $2  as above, bold italic
.RB $1 $2  as above, regular bold.
.BB $1 $2  as above, bold regular
.RS Store indents
.RE Restore indents
.R  Register sign (R)

\fX change font (B, R)
\-  char -
\`  char `


.AT (settings for Unix)
.UC (settings for BSD)
.DT (tabs every .5 inches)
.PD ?

.LP  ??

.IP