A macro processor for Unix and GCOS which is more flexible than cpp. m4 copies
its input to the output, expanding macros which can be either built-in or
user-defined. m4 has built-in functions for including files, running Unix
commands, doing integer arithmetic, manipulating text in various ways and
recursing. m4 can be used either as a front-end to a compiler or as a
sendmail's configuration file (/etc/sendmail.cf) is writen in m4 macros.
There is a GNU m4 v1.1 by Francois Pinard <[email protected]>
and a public domain version by Ozan Yigit <[email protected]> and Richard
<[email protected]> (FTP from any 386BSD, NetBSD or FreeBSD
archive). A Macintosh version is here.
See also m3, m5.
["The M4 Macro Processor", Kernighan & Ritchie, Jul 1977].
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