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<sect1 id="using-cygwinenv"><title>The <EnVar>CYGWIN</EnVar> environment
variable</title>
<para>The <EnVar>CYGWIN</EnVar> environment variable is used to configure
many global settings for the Cygwin runtime system. It contains the options
listed below, separated by blank characters. Many options can be turned off
by prefixing with <literal>no </literal>.</para>
<itemizedlist Mark="bullet">
<listitem>
<para><FirstTerm>(no)binmode</FirstTerm> - if set, non-disk
(e.g. pipe and COM ports) file opens default to binary mode
(no CR/LF/Ctrl-Z translations) instead of text mode.
Defaults to set (binary mode). This option must be set
before starting a Cygwin shell to have an effect on redirection.
</para>
<warning><title>Warning!</title><para>If set in 12/98 b20.1, all files
always open in binary mode.</para> </warning>
</listitem>
<listitem>
<para><FirstTerm>(no)envcache</FirstTerm> - If set, environment variable
conversions (between Win32 and POSIX) are cached. Note that this is may
cause problems if the mount table changes, as the cache is not invalidated
and may contain values that depend on the previous mount table
contents. Defaults to set.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)export</FirstTerm> - if set, the final values of these
settings are re-exported to the environment as $CYGWIN again.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)glob</FirstTerm> - if set, command line arguments
containing UNIX-style file wildcard characters (brackets, question mark,
asterisk, escaped with \) are expanded into lists of files that match
those wildcards.
This is applicable only to programs running from a DOS command line prompt.
Default is set.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)ntea</FirstTerm> - if set, use the full NT Extended
Attributes to store UNIX-like inode information.
This option only operates under Windows NT. Defaults to not set. </para>
<Warning><Title>Warning!</Title> <para>This may create additional
<emphasis>large</emphasis> files on non-NTFS partitions.</para></Warning>
</listitem>
<listitem>
<para><FirstTerm>(no)ntsec</FirstTerm> - if set, use the NT security
model to set UNIX-like permissions on files and processes. The
file permissions can only be set on NTFS partitions. FAT and SAMBA doesn't
support the NT file security. For more information, read the documentation
in <citation>ntsec.sgml</citation>.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)reset_com</FirstTerm> - if set, serial ports are reset
to 9600-8-N-1 with no flow control when used. This is done at open
time and when handles are inherited. Defaults to set.</para>
</listitem>
<listitem>
<para><FirstTerm>strace=n[:cache][,filename]</FirstTerm> - configures system
tracing. Off by default, setting various bits in <literal>n</literal> (a
bit flag) enables various types of system messages. Setting
<literal>n</literal> to 1 enables most messages. Other values can be found
in <filename>sys/strace.h</filename>. The <literal>:cache</literal> option
lets you specify how many lines to cache before flushing the output
(example: <literal>strace=1:20</literal>). The <literal>filename</literal>
option lets you send the messages to a file instead of the screen. </para>
</listitem>
<listitem>
<para><FirstTerm>(no)strip_title</FirstTerm> - if set, strips the directory
part off the window title, if any. Default is not set.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)title</FirstTerm> - if set, the title bar
reflects the name of the program currently running. Default is not
set. Note that under Win9x the title bar is always enabled and it is
stripped by default, but this is because of the way Win9x works. In
order not to strip, specify <literal>title</literal> or <literal>title
nostrip_title</literal>.</para>
</listitem>
<listitem>
<para><FirstTerm>(no)tty</FirstTerm> - if set, Cygwin enables extra support
(i.e., termios) for UNIX-like ttys.
It is not compatible with some Windows programs.
Defaults to not set, in which case the tty is opened in text mode
with ^Z as EOF. Note that this has been changed such that ^D works as
expected instead of ^Z, and is settable via stty.
This option must be specified before starting a Cygwin shell
and it cannot be changed in the shell.</para>
</listitem>
</itemizedlist>
</sect1>
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