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HTML
69 lines
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>23. File System Interface</TITLE>
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<BODY>
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<meta name="description" value=" File System Interface">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4056 HREF="node203.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4054 HREF="clm.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4048 HREF="node201.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4058 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4059 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4057 HREF="node203.html"> File Names</A>
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<B>Up:</B> <A NAME=tex2html4055 HREF="clm.html">Common Lisp the Language</A>
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<B> Previous:</B> <A NAME=tex2html4049 HREF="node201.html"> Querying the User</A>
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<HR> <P>
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<H1><A NAME=SECTION002700000000000000000>23. File System Interface</A></H1>
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<P>
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<A NAME=FILES>A</A>
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frequent use of streams is to communicate with a <i>file system</i>
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to which groups of data (files) can be written and from which files
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can be retrieved.
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<P>
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Common Lisp defines a standard interface for dealing with such a file system.
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This interface is designed to be simple and general enough to
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accommodate the facilities provided by ``typical'' operating system
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environments within which Common Lisp is likely to be implemented.
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The goal is to make Common Lisp programs that perform only simple operations
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on files reasonably portable.
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<P>
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To this end, Common Lisp assumes that files are named, that given a name one
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can construct a stream connected to a file of that name, and that the
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names can be fit into a certain canonical, implementation-independent
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form called a <i>pathname</i>.
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<P>
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Facilities are provided for manipulating pathnames, for creating
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streams connected to files, and for manipulating the file system
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through pathnames and streams.
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<P>
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<HR>
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<UL>
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<LI> <A NAME=tex2html4060 HREF="node203.html#SECTION002710000000000000000"> File Names</A>
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<UL>
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<LI> <A NAME=tex2html4061 HREF="node204.html#SECTION002711000000000000000"> Pathnames</A>
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<LI> <A NAME=tex2html4062 HREF="node205.html#SECTION002712000000000000000"> Case Conventions</A>
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<LI> <A NAME=tex2html4063 HREF="node206.html#SECTION002713000000000000000"> Structured Directories</A>
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<LI> <A NAME=tex2html4064 HREF="node207.html#SECTION002714000000000000000"> Extended Wildcards</A>
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<LI> <A NAME=tex2html4065 HREF="node208.html#SECTION002715000000000000000"> Logical Pathnames</A>
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<UL>
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<LI> <A NAME=tex2html4066 HREF="node209.html#SECTION002715100000000000000"> Syntax of Logical Pathname Namestrings</A>
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<LI> <A NAME=tex2html4067 HREF="node210.html#SECTION002715200000000000000"> Parsing of Logical Pathname Namestrings</A>
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<LI> <A NAME=tex2html4068 HREF="node211.html#SECTION002715300000000000000"> Using Logical Pathnames</A>
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<LI> <A NAME=tex2html4069 HREF="node212.html#SECTION002715400000000000000"> Examples of the Use of Logical Pathnames</A>
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<LI> <A NAME=tex2html4070 HREF="node213.html#SECTION002715500000000000000"> Discussion of Logical Pathnames</A>
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</UL>
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<LI> <A NAME=tex2html4071 HREF="node214.html#SECTION002716000000000000000"> Pathname Functions</A>
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</UL>
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<LI> <A NAME=tex2html4072 HREF="node215.html#SECTION002720000000000000000"> Opening and Closing Files</A>
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<LI> <A NAME=tex2html4073 HREF="node216.html#SECTION002730000000000000000"> Renaming, Deleting, and Other File Operations</A>
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<LI> <A NAME=tex2html4074 HREF="node217.html#SECTION002740000000000000000"> Loading Files</A>
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<LI> <A NAME=tex2html4075 HREF="node218.html#SECTION002750000000000000000"> Accessing Directories</A>
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</UL>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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