m4 - Unix, Linux Command

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M4 - manual page for M4 1.4.5


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


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

Operation modes:

--help display this help and exit
  output version information and exit
-E, --fatal-warnings
  stop execution after first warning
-e, --interactive
  unbuffer output, ignore interrupts
-P, --prefix-builtins
  force a ‘m4_’ prefix to all builtins
-Q, --quiet, --silent
  suppress some warnings for builtins

Preprocessor features:

-D, --define=NAME[=VALUE]
  enter NAME has having VALUE, or empty
-I, --include=DIRECTORY
  append this directory to include path
-s, --synclines
  generate ‘#line NO "FILE"’ lines
-U, --undefine=NAME
  delete builtin NAME

Limits control:

-G, --traditional
  suppress all GNU extensions
-H, --hashsize=PRIME
  set symbol lookup hash table size [509]
-L, --nesting-limit=NUMBER
  change artificial nesting limit [1024]

Frozen state files:

-F, --freeze-state=FILE
  produce a frozen state on FILE at end
-R, --reload-state=FILE
  reload a frozen state from FILE at start


-d, --debug[=FLAGS]
  set debug level (no FLAGS implies ‘aeq’)
-l, --arglength=NUM
  restrict macro tracing size
-o, --error-output=FILE
  redirect debug and trace output
-t, --trace=NAME
  trace NAME when it will be 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
V shorthand for all of the other flags
x add a unique macro call id, useful with c flag
If defined, the environment variable ‘M4PATH’ is a colon-separated list of directories included after any specified by ‘-I’.

If no FILE or if FILE is ‘-’, standard input is read.

Exit status is 0 for success, 1 for failure, or whatever value was passed to the m4exit macro.


Written by Rene’ Seindal.


Copyright © 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


M4 is maintained as a Texinfo manual. If the info and M4 programs are properly installed at your site, the command
info M4
should give you access to the complete manual.
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