# GNU M4

M4 is a powerful macro processor that copies files while expanding the macros that they contain. These macros are either built-in or user-defined and can take any number of arguments.

## Features

- Macro expansion with built-in and user-defined macros
- File inclusion capabilities
- Unix command execution
- Integer arithmetic operations
- Text manipulation functions
- Recursion support
- Can be used as a compiler front-end or standalone macro processor

## Description

The GNU M4 implementation of the traditional Unix macro processor is designed to be compatible with the original while providing many enhancements. M4 is particularly useful for:

- Generating configuration files
- Creating template-based code generation
- Preprocessing source code
- Building complex text processing pipelines

## Installation

This package installs the `m4` binary to `/usr/bin` along with supporting documentation and manual pages.

## Usage

Basic usage involves processing input files and expanding macros:

```bash
m4 input.txt > output.txt
```

M4 can be used interactively or in shell scripts, making it a versatile tool for system administration and software development tasks.