SYNOPSIS
       m4 [OPTION]... [FILE]...

DESCRIPTION
       Process  macros in FILEs.  If no FILE or if FILE is `-', standard input
       is read.

       Mandatory or optional  arguments  to  long  options  are  mandatory  or
       optional for short options too.

   Operation modes:
       --help display this help and exit

       --version
              output version information and exit

       -E, --fatal-warnings
              once:  warnings  become  errors,  twice: stop execution at first
              error

       -i, --interactive
              unbuffer output, ignore interrupts

       -P, --prefix-builtins
              force a `m4_' prefix to all builtins

       -Q, --quiet, --silent
              suppress some warnings for builtins

       --warn-macro-sequence[=REGEXP]
              warn if macro definition matches REGEXP,

              default \$\({[^}]*}\|[0-9][0-9]+\)

   Preprocessor features:
       -D, --define=NAME[=VALUE]
              define NAME as having VALUE, or empty

       -I, --include=DIRECTORY
              append DIRECTORY to include path

       -s, --synclines
              generate `#line NUM "FILE"' lines

       -U, --undefine=NAME
              undefine NAME

   Limits control:
       -g, --gnu
              override -G to re-enable GNU extensions

       -G, --traditional
              suppress all GNU extensions
              reload a frozen state from FILE at start

   Debugging:
       -d, --debug[=FLAGS]
              set debug level (no FLAGS implies `aeq')

       --debugfile[=FILE]
              redirect debug and trace output to FILE (default stderr, discard
              if empty string)

       -l, --arglength=NUM
              restrict macro tracing size

       -t, --trace=NAME
              trace NAME when it is defined

   FLAGS is any of:
       a      show actual arguments

       c      show before collect, after collect and after call

       e      show expansion

       f      say current input file name

       i      show changes in input files

       l      say current input line number

       p      show results of path searches

       q      quote values as necessary, with a or e flag

       t      trace for all macro calls, not only traceon'ed

       x      add a unique macro call id, useful with c flag

       V      shorthand for all of the above flags

       If defined, the environment variable `M4PATH' is a colon-separated list
       of directories included after any specified by `-I'.

       Exit status is 0 for success, 1 for failure, 63 for frozen file version
       mismatch, or whatever value was passed to the m4exit macro.

AUTHOR
       Written by Rene' Seindal.

REPORTING BUGS
       Report    bugs    to    <bug-m4@gnu.org>.     GNU    M4    home   page:
       <http://www.gnu.org/software/m4/>.  General help  using  GNU  software:
       <http://www.gnu.org/gethelp/>.

COPYRIGHT
       should give you access to the complete manual.