137 lines
6.6 KiB
Plaintext
137 lines
6.6 KiB
Plaintext
<sect1 id="using-cygwinenv"><title>The <EnVar>CYGWIN</EnVar> environment
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variable</title>
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<para>The <EnVar>CYGWIN</EnVar> environment variable is used to configure
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many global settings for the Cygwin runtime system. It contains the options
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listed below, separated by blank characters. Many options can be turned off
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by prefixing with <literal>no </literal>.</para>
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<itemizedlist Mark="bullet">
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<listitem>
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<para><FirstTerm>(no)binmode</FirstTerm> - if set, non-disk
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(e.g. pipe and COM ports) file opens default to binary mode
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(no CRLF translation) instead of text mode. Defaults to set (binary
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mode). By default, devices are opened in binary mode, so this option
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has little effect on normal cygwin operations.
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It does affect two things, however. For non-NTFS filesystems, this
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option will control the line endings for standard output/input/error
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for redirection from the Windows command shell. It will also affect
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the default translation mode of a pipe, although most shells set the
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pipe to binary by default.
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</para>
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<warning><title>Warning!</title><para>If set in 12/98 b20.1, all files
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always open in binary mode.</para></warning>
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</listitem>
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<listitem>
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<para><FirstTerm>check_case:level</FirstTerm> - Controls the behaviour of
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Cygwin when a user tries to open or create a file using a case different from
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the case of the path as asved on the disk.
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<literal>level</literal> is one of <literal>relaxed</literal>,
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<literal>adjust</literal> and <literal>strict</literal>.</para>
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<itemizedlist Mark="bullet">
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<listitem>
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<para><FirstTerm>relaxed</FirstTerm> which is the default behaviour simply
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ignores case. That's the default for native Windows applications as well.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>adjust</FirstTerm> behaves mostly invisible. The POSIX input
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path is internally adjusted in case, so that the resulting DOS path uses the
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correct case throughout. You can see the result when changing the directory
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using a wrong case and calling <command>/bin/pwd</command> afterwards.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>strict</FirstTerm> results in a error message if the case
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isn't correct. Trying to open a file <filename>Foo</filename> while a file
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<filename>fOo</filename> exists results in a "no such file or directory"
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error. Trying to create a file <filename>BAR</filename> while a file
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<filename>Bar</filename> exists results in a "Filename exists with different
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case" error.</para>
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</listitem>
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</itemizedlist>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)envcache</FirstTerm> - If set, environment variable
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conversions (between Win32 and POSIX) are cached. Note that this is may
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cause problems if the mount table changes, as the cache is not invalidated
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and may contain values that depend on the previous mount table
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contents. Defaults to set.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)export</FirstTerm> - if set, the final values of these
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settings are re-exported to the environment as $CYGWIN again.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>error_start:filepath</FirstTerm> - if set, runs <filename>filepath</filename>
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when cygwin encounters a fatal error. This is useful for debugging.
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<filename>filepath</filename> is usually set to the path to the <filename>gdb</filename>
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program.</para>
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<para><FirstTerm>(no)glob[:ignorecase]</FirstTerm> - if set, command line arguments
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containing UNIX-style file wildcard characters (brackets, question mark,
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asterisk, escaped with \) are expanded into lists of files that match
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those wildcards.
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This is applicable only to programs running from a DOS command line prompt.
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Default is set.</para>
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<para>This option also accepts an optional <literal>[no]ignorecase</literal> modifer.
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If supplied, wildcard matching is case insensitive. The default is <literal>noignorecase</literal></para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)ntea</FirstTerm> - if set, use the full NT Extended
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Attributes to store UNIX-like inode information.
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This option only operates under Windows NT. Defaults to not set. </para>
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<Warning><Title>Warning!</Title> <para>This may create additional
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<emphasis>large</emphasis> files on non-NTFS partitions.</para></Warning>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)ntsec</FirstTerm> - if set, use the NT security
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model to set UNIX-like permissions on files and processes. The
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file permissions can only be set on NTFS partitions. FAT doesn't
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support the NT file security. For more information, read the documentation
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in <citation>ntsec.sgml</citation>.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)smbntsec</FirstTerm> - if set, use `ntsec' on remote
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drives as well (this is the default). If you encounter problems with NT shares
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or Samba drives, setting this to `nosmbntsec' could help. In that case the
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permission and owner/group information is faked as on FAT partitions.
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A reason for a non working ntsec on remote drives could be insufficient
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permissions of the users. Since the needed user rights are somewhat dangerous
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(SeRestorePrivilege) it's not always an option to grant that rights to users.
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However, this shouldn't be a problem in NT domain environments.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)reset_com</FirstTerm> - if set, serial ports are reset
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to 9600-8-N-1 with no flow control when used. This is done at open
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time and when handles are inherited. Defaults to set.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)strip_title</FirstTerm> - if set, strips the directory
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part off the window title, if any. Default is not set.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)title</FirstTerm> - if set, the title bar
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reflects the name of the program currently running. Default is not
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set. Note that under Win9x the title bar is always enabled and it is
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stripped by default, but this is because of the way Win9x works. In
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order not to strip, specify <literal>title</literal> or <literal>title
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nostrip_title</literal>.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)tty</FirstTerm> - if set, Cygwin enables extra support
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(i.e., termios) for UNIX-like ttys.
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It is not compatible with some Windows programs.
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Defaults to not set, in which case the tty is opened in text mode
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with ^Z as EOF. Note that this has been changed such that ^D works as
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expected instead of ^Z, and is settable via stty.
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This option must be specified before starting a Cygwin shell
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and it cannot be changed in the shell.</para>
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</listitem>
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<listitem>
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<para><FirstTerm>(no)winsymlinks</FirstTerm> - if set, Cygwin creates
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symlinks as Windows shortcuts with a special header and the R/O attribute
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set. If not set, Cygwin creates symlinks as plain files with a magic number,
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a path and the system attribute set. Defaults to set.</para>
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</listitem>
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</itemizedlist>
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</sect1>
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