GNU m4

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1.4.17 GPL (GNU General Public License)    
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A free and open source implementation of the traditional macro processor from UNIX

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GNU m4 is an open source implementation of the traditional UNIX macro processor. It is mostly SVR4 compatible although it has some extensions (for example, handling more than 9 positional parameters to macros).

GNU m4 also includes built-in functions for adding files, running shell commands, doing arithmetic functions, and much more. It can copy its input to the output, expanding macros as it goes.

Macros are either user-defined or built-in, and can take any number of arguments. Besides just doing macro expansion the GNU m4 software can manipulate text in various ways.

GNU m4 can be used either as a macro processor or as a front-end to a compiler. It comes pre-installed in many popular Linux operating systems.
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Last updated on September 24th, 2013
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GNU m4 - The help menu of the GNU m4 software, as viewed from the Linux TerminalGNU m4 - The usage menu of the GNU m4 applicationGNU m4 - The GNU m4 software running on the Arch Linux operating system

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