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<HTML><HEAD><TITLE>M4</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.63"><LINKREL="HOME"TITLE="Linux From Scratch"HREF="../index.html"><LINKREL="UP"TITLE="Package descriptions"HREF="../appendixa/appendixa.html"><LINKREL="PREVIOUS"TITLE="Perl"HREF="../appendixa/perl.html"><LINKREL="NEXT"TITLE="Autoconf"HREF="../appendixa/autoconf.html"></HEAD><BODYCLASS="sect1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Linux From Scratch: Version 3.1</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="../appendixa/perl.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Appendix A. Package descriptions</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="../appendixa/autoconf.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="sect1"><H1CLASS="sect1"><ANAME="aa-m4">A.30. M4</A></H1><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN5367">A.30.1. Contents</A></H2><P>The M4 package contains the M4 processor</P></DIV><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN5370">A.30.2. Description</A></H2><P>M4 is a macro processor. It copies input to output expanding macros as it goes. Macros are either built-in or user-defined and can take any numberof arguments. Besides just doing macro expansion m4 has built-in functions for including named files, running UNIX commands, doing integer arithmetic, manipulating text in various ways, recursion, etc. M4 can be used either as a front-end to a compiler or as a macro processor in its own right.</P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="../appendixa/perl.html">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="../index.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="../appendixa/autoconf.html">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Perl</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="../appendixa/appendixa.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Autoconf</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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