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22 lines
3.2 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>File permissions</title><link rel="stylesheet" type="text/css" href="docbook.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="cygwin-ug-net.html" title="Cygwin User's Guide"><link rel="up" href="using.html" title="Chapter 3. Using Cygwin"><link rel="prev" href="using-textbinary.html" title="Text and Binary modes"><link rel="next" href="using-specialnames.html" title="Special filenames"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">File permissions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using-textbinary.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using Cygwin</th><td width="20%" align="right"> <a accesskey="n" href="using-specialnames.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="using-filemodes"></a>File permissions</h2></div></div></div><p>On FAT or FAT32 filesystems, files are always readable, and Cygwin
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uses the DOS read-only attribute to determine if they are writable. Files are
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considered to be executable if the filename ends with .bat, .com or .exe, or
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if its content starts with #!. Consequently <span class="command"><strong>chmod</strong></span> can
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only affect the "w" mode, it silently ignores actions involving the other
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modes. This means that <span class="command"><strong>ls -l</strong></span>
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needs to open and read files. It can thus be relatively slow.</p><p>On NTFS, file permissions are evaluated using the Access Control
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Lists (ACLs) attached to a file. This can be switched off by using the
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"noacl" option to the respective mount point in the
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<code class="filename">/etc/fstab</code> or <code class="filename">/etc/fstab.d/$USER</code>
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file. For more information on file permissions, see
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<a class="xref" href="ntsec.html" title="POSIX accounts, permission, and security">the section called “POSIX accounts, permission, and security”</a>.
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</p><p>On NFS shares, file permissions are exactly the POSIX permissions
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transmitted from the server using the NFSv3 protocol, if the NFS client
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is the one from Microsoft's "Services For Unix", or the one built into
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Windows Vista or later.
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</p><p>Only the user and group ownership is not necessarily correct.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using-textbinary.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using-specialnames.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Text and Binary modes </td><td width="20%" align="center"><a accesskey="h" href="cygwin-ug-net.html">Home</a></td><td width="40%" align="right" valign="top"> Special filenames</td></tr></table></div></body></html>
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