man

Location of Manual Pages
     The online Reference Manual page directories are convention-
     ally  located  in  /usr/share/man.  The  nroff  sources  are
     located in the /usr/share/man/man*  directories.  The   SGML
     sources are located in the /usr/share/man/sman* directories.
     Each directory corresponds to a section of the manual. Since
     these  directories  are optionally installed, they might not
     reside on your host. You might have to mount  /usr/share/man
     from a host on which they do reside.


     If  there  are  preformatted,  up-to-date  versions  in  the
     corresponding  cat* or fmt* directories, man simply displays
     or prints those versions. If  the  preformatted  version  of
     interest  is  out of date or missing, man reformats it prior
     to display and stores the preformatted version if   cat*  or
     fmt* is writable.   The  windex database is not updated. See
     catman(1M). If directories for the preformatted versions are
     not   provided,    man  reformats  a  page  whenever  it  is
     requested. man uses a temporary file to store the  formatted
     text during display.