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           lexgrog [-m|-c] [-fhwV] [-E encoding] file ...


           lexgrog  is  an implementation of the traditional "groff guess" utility
           in lex.  It reads the list of files on its command line as  either  man
           page  source files or preformatted "cat" pages, and displays their name
           and description as used by apropos and whatis, the list of  preprocess-
           ing  filters  required  by the man page before it is passed to nroff or
           troff, or both.
           If its input is badly formatted, lexgrog  will  print  "parse  failed";
           this  may  be useful for external programs that need to check man pages
           for correctness.  If one of lexgrog's input files is "-", it will  read
           from  standard  input;  if any input file is compressed, a decompressed
           version will be read automatically.


           -m, --man
                  Parse input as man page source files.  This is  the  default  if
                  neither --man nor --cat is given.
           -c, --cat
                  Parse  input as preformatted man pages ("cat pages").  --man and
                  --cat may not be given simultaneously.
           -w, --whatis
                  Display the name and description from the man page's header,  as
                  used  by  apropos  and  whatis.   This is the default if neither
                  --whatis nor --filters is given.
           -f, --filters
                  Display the list of filters needed to preprocess  the  man  page
                  before formatting with nroff or troff.
           -E encoding, --encoding encoding
                  Override the guessed character set for the page to encoding.
           -h, --help
                  Print a help message and exit.
           -V, --version
                  Display version information.


           0      Successful program execution.
           1      Usage error.
           2      lexgrog failed to parse one or more of its input files.


           been used, it may sometimes fail to extract the required information.
           When  using the traditional man macro set, a correct NAME section looks
           something like this:
                  .SH NAME
                  foo \- program to do something
           Some manual pagers require the '\-' to be exactly as  shown;  mandb  is
           more tolerant, but for compatibility with other systems it is neverthe-
           less a good idea to retain the backslash.
           On the left-hand side, there may be several names, separated by commas.
           Names  containing  whitespace  will  be  ignored  to avoid pathological
           behaviour on certain ill-formed NAME sections.  The text on the  right-
           hand side is free-form, and may be spread over multiple lines.  If sev-
           eral features with different descriptions are being documented  in  the
           same manual page, the following form is therefore used:
                  .SH NAME
                  foo, bar \- programs to do something
                  baz \- program to do nothing
           (A macro which starts a new paragraph, like .PP, may be used instead of
           the break macro .br.)
           When using the BSD-derived mdoc macro set, a correct NAME section looks
           something like this:
                  .Sh NAME
                  .Nm foo
                  .Nd program to do something
           There  are  several common reasons why whatis parsing fails.  Sometimes
           authors of manual pages replace '.SH NAME' with  '.SH  MYPROGRAM',  and
           then  mandb  cannot find the section from which to extract the informa-
           tion it needs.  Sometimes authors include a  NAME  section,  but  place
           free-form  text  there rather than 'name \- description'.  However, any
           syntax resembling the above should be accepted.


           apropos(1), man(1), whatis(1), mandb(8)


           lexgrog attempts to parse files containing .so requests, but will  only
           be  able  to  do  so correctly if the files are properly installed in a
           manual page hierarchy.


           The code used by lexgrog to scan man pages was written by:

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