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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE reference PUBLIC "-//OASIS//DTD DocBook V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<reference id="intro" xmlns:xi="http://www.w3.org/2001/XInclude">
<referenceinfo>
<xi:include href="legal.xml"/>
</referenceinfo>
<title>Cygwin</title>
<refentry id="intro1">
<refmeta>
<refentrytitle>intro</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="manual">Cygwin</refmiscinfo>
</refmeta>
<refnamediv>
<refname>intro</refname>
<refpurpose>Introduction to the Cygwin Environment</refpurpose>
</refnamediv>
<refsect1>
<title>DESCRIPTION</title>
<para><emphasis>Cygwin</emphasis> is a Linux-like environment for
Windows. It consists of two parts:</para>
<para>A DLL (<filename>cygwin1.dll</filename>) which acts as a POSIX API
emulation layer providing substantial POSIX API functionality, modelled
after the GNU/Linux operating system. The
<citerefentry><refentrytitle>intro</refentrytitle><manvolnum>3</manvolnum></citerefentry>
man page gives an introduction to this API.</para>
<para>A collection of tools which provide Linux look and feel. This man
page describes the user environment.</para>
</refsect1>
<refsect1>
<title>AVAILABILITY</title>
<para><emphasis>Cygwin</emphasis> is developed by volunteers collaborating
over the Internet. It is distributed through the website <ulink
url="http://cygwin.com"/>, where you can find extensive documentation,
including FAQ, User's Guide, and API Reference. The
<emphasis>Cygwin</emphasis> website should be considered the authoritative
source of information. The source code, released under the <emphasis>GNU
General Public License, Version 3 (GPLv3+)</emphasis> and
<emphasis>Lesser GNU General Public License, Version 3 (LGPLv3+)</emphasis>,
is also available from the website or one of the mirrors.</para>
</refsect1>
<refsect1>
<title>COMPATIBILITY</title>
<para><emphasis>Cygwin</emphasis> uses the GNU versions of many of the
standard UNIX command-line utilities (<command>sed</command>,
<command>awk</command>, etc.), so the user environment is more similar to
a Linux system than, for example, Sun Solaris.</para>
<para>The default login shell and <command>/bin/sh</command> for
<emphasis>Cygwin</emphasis> is <command>bash</command>, the GNU
"Bourne-Again Shell", but other shells such as <command>tcsh</command>
(an improved <command>csh</command>) are also available and can be
installed using <emphasis>Cygwin</emphasis>'s setup.</para>
</refsect1>
<refsect1>
<title>NOTES</title>
<para>To port applications you will need to install the development tools,
which you can do by selecting <package>gcc</package> in
<emphasis>setup.exe</emphasis> (dependencies are automatically handled).
If you need a specific program or library, you can search for a
<emphasis>Cygwin</emphasis> package containing it at:</para>
<para>
<ulink url="http://cygwin.com/packages/"/>
</para>
<para>If you are a UNIX veteran who plans to use
<emphasis>Cygwin</emphasis> extensively, you will probably find it worth
your while to learn to use <emphasis>Cygwin</emphasis>-specific tools that
provide a UNIX-like interface to common operations. For example,
<command>cygpath</command> converts between UNIX and Win32-style
pathnames. The full documentation for these utilities is at:</para>
<para>
<ulink url="http://cygwin.com/cygwin-ug-net/using-utils.html"/>
</para>
<para>The optional <package>cygutils</package> and
<package>cygutils-extra</package> packages also contain utilities that
help with common problems.</para>
</refsect1>
<refsect1>
<title>DOCUMENTATION</title>
<para>In addition to man pages and texinfo documentation, many
<emphasis>Cygwin</emphasis> packages provide system-independent
documentation in the <filename>/usr/share/doc/</filename> directory and
<emphasis>Cygwin</emphasis>-specific documentation in
<filename>/usr/share/doc/Cygwin/</filename></para>
<para>For example, if you have both <command>less</command> and
<command>cron</command> installed, the command <command>less
/usr/share/doc/Cygwin/cron.README</command> would display the instructions
to set up <command>cron</command> on your system.</para>
</refsect1>
<refsect1>
<title>REPORTING BUGS</title>
<para>If you find a bug in <emphasis>Cygwin</emphasis>, please read</para>
<para>
<ulink url="http://cygwin.com/bugs.html"/>
</para>
<para>and follow the instructions for reporting found there. If you are
able to track down the source of the bug and can provide a fix, there are
instructions for contributing patches at:</para>
<para>
<ulink url="http://cygwin.com/contrib.html"/>
</para>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>intro</refentrytitle>
<manvolnum>3</manvolnum>
</citerefentry>
</para>
</refsect1>
</refentry>
<refentry id="intro3">
<refmeta>
<refentrytitle>intro</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo class="manual">Cygwin</refmiscinfo>
</refmeta>
<refnamediv>
<refname>intro</refname>
<refpurpose>Introduction to the Cygwin API</refpurpose>
</refnamediv>
<refsect1>
<title>DESCRIPTION</title>
<para><emphasis>Cygwin</emphasis> is a Linux-like environment for
Windows. It consists of two parts:</para>
<para>A DLL (<filename>cygwin1.dll</filename>) which acts as a POSIX API
emulation layer providing substantial POSIX API functionality, modelled
after the GNU/Linux operating system. This page describes the API provided
by the DLL.
</para>
<para>A collection of tools which provide Linux look and feel. This
environment is described in the
<citerefentry><refentrytitle>intro</refentrytitle><manvolnum>1</manvolnum></citerefentry>
man page.</para>
</refsect1>
<refsect1>
<title>AVAILABILITY</title>
<para><emphasis>Cygwin</emphasis> is developed by volunteers collaborating
over the Internet. It is distributed through the website <ulink
url="http://cygwin.com"/>. The website has extensive documentation,
including FAQ, User's Guide, and API Reference. It should be considered
the authoritative source of information. The source code, released under
the <emphasis>GNU General Public License, Version 3 (GPLv3+)</emphasis> and
<emphasis>Lesser GNU General Public License, Version 3 (LGPLv3+)</emphasis>,
is also available from the website or one of the mirrors.</para>
</refsect1>
<refsect1>
<title>COMPATIBILITY</title>
<para><emphasis>Cygwin</emphasis> policy is to attempt to adhere to
<emphasis>POSIX.1-2008/SUSv4</emphasis> (Portable Operating System
Interface for UNIX / The Single UNIX Specification, Version 4) where
possible.</para>
<para><emphasis>SUSv4</emphasis> is available online at:</para>
<para>
<ulink url="http://pubs.opengroup.org/onlinepubs/9699919799/"/>
</para>
<para>For compatibility information about specific functions, see the API
Reference at:</para>
<para>
<ulink url="http://cygwin.com/cygwin-api/cygwin-api.html"/>
</para>
<para>Where these standards are ambiguous, Cygwin tries to mimic
<emphasis>Linux</emphasis>. However, <emphasis>Cygwin</emphasis> uses
<emphasis>newlib</emphasis> instead of <emphasis>glibc</emphasis> as its C
Library, available at:</para>
<para>
<ulink url="https://sourceware.org/newlib/"/>
</para>
<para>Keep in mind that there are many underlying differences between UNIX
and Win32 making complete compatibility an ongoing challenge.</para>
</refsect1>
<refsect1>
<title>REPORTING BUGS</title>
<para>If you find a bug in <emphasis>Cygwin</emphasis>, please read</para>
<para>
<ulink url="http://cygwin.com/bugs.html"/>
</para>
<para>and follow the instructions for reporting found there. If you are
able to track down the source of the bug and can provide a fix, there are
instructions for contributing patches at:</para>
<para>
<ulink url="http://cygwin.com/contrib.html"/>
</para>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>intro</refentrytitle>
<manvolnum>1</manvolnum>
</citerefentry>
</para>
</refsect1>
</refentry>
</reference>
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