| m4 | copies the given files while expanding the macros that they
contain. These macros are either built-in or user-defined and can
take any number of arguments. Besides performing macro expansion,
m4 has built-in functions for including named
files, running Unix commands, performing integer arithmetic,
manipulating text, recursion, etc. The m4 program
can be used either as a front-end to a compiler or as a macro processor
in its own right. |