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Code Editor : envvar.htm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML
><HEAD
><TITLE
>Environment variables</TITLE
><META
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><BODY
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> User Guide: A Guide to Installing, Configuring, and Running <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
></TH
></TR
><TR
><TD
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><A
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>Prev</A
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><TD
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><DIV
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><H1
CLASS="SECT1"
><A
NAME="ENVVAR"
>Environment variables</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="WHATFOR"
>What they're for</A
></H2
><P
>You can use environment variables to
				<P
></P
><UL
><LI
><P
>Override some of the settings in <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
>'s configuration file.</P
></LI
><LI
><P
>Advertise the location of the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> libraries to programs that want them.</P
></LI
><LI
><P
>Control how logging is done.</P
></LI
></UL
>
				
				This section covers the first two items.  For information about environment variables that control logging, see <A
HREF="logging.htm"
>Logging</A
></P
><P
>In a typical system, no environment variables need be used.  They're sometimes handy for testing, for instance setting <CODE
CLASS="ENVAR"
>TDSVER</CODE
> to check if a connection problem is due to using the wrong protocol version.  And they have other uses, described below.  But they're just knobs, so don't feel you have to turn every one, unless you're the sort that likes turning knobs.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><P
><B
>Environment Variables</B
></P
><DL
><DT
><CODE
CLASS="ENVAR"
>FREETDS</CODE
></DT
><DD
><P
>may be used to specify the name and location of the <TT
CLASS="FILENAME"
>freetds.conf</TT
> file.  In prior versions of <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> this variable was known as <CODE
CLASS="ENVAR"
>FREETDSCONF</CODE
>.</P
></DD
><DT
><CODE
CLASS="ENVAR"
>TDSVER</CODE
></DT
><DD
><P
>governs the version of the <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> protocol used to connect to your server.  For a given server, <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> inspects four sources in the following order to determine which <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> protocol version to use, using the first one it finds.</P
><P
></P
><OL
TYPE="1"
><LI
><P
>The value specified in <CODE
CLASS="ENVAR"
>TDSVER</CODE
></P
></LI
><LI
><P
>A <TT
CLASS="FILENAME"
>freetds.conf</TT
> file entry (see below)</P
></LI
><LI
><P
>The <TT
CLASS="FILENAME"
>interfaces</TT
> file entry (see below)</P
></LI
><LI
><P
>The <CODE
CLASS="OPTION"
>--with-tdsver</CODE
> option passed to <B
CLASS="COMMAND"
>configure</B
></P
></LI
></OL
></DD
><DT
><CODE
CLASS="ENVAR"
>TDSPORT</CODE
></DT
><DD
><P
>specifies a TCP port number at which the servername is listening.  It overrides the default port (1433 for TDS 4.2/7.0/7.1/7.2, 4000 for TDS 5.0) as well as any port specified in the <TT
CLASS="FILENAME"
>freetds.conf</TT
> file.</P
></DD
><DT
><CODE
CLASS="ENVAR"
>SYBASE</CODE
></DT
><DD
><P
>points to the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> run-time directory.  Use of this variable originated with Sybase (the company), and many programs still rely on <CODE
CLASS="ENVAR"
>SYBASE</CODE
> to discover the location of the <SPAN
CLASS="QUOTE"
>"SYBASE"</SPAN
> libraries.</P
><P
>The primary use of <CODE
CLASS="ENVAR"
>SYBASE</CODE
> is to advertise the location of the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> libraries.  A secondary use is to point to the location of the <TT
CLASS="FILENAME"
>interfaces</TT
> file (if used, see the <A
HREF="interfacesfile.htm"
>Appendix</A
>), which some programs examine directly.</P
></DD
><DT
><CODE
CLASS="ENVAR"
>TDSQUERY</CODE
>, <CODE
CLASS="ENVAR"
>DSQUERY</CODE
></DT
><DD
><P
>provides a server name to connect to if none is specified by the application.  <CODE
CLASS="ENVAR"
>DSQUERY</CODE
> is the historical Sybase name for this variable.</P
></DD
><DT
><CODE
CLASS="ENVAR"
>TDSHOST</CODE
></DT
><DD
><P
>overrides the host specified in the <TT
CLASS="FILENAME"
>freetds.conf</TT
>.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="SETTING"
>Setting environment variables</A
></H2
><P
>Of course, each shell is a little different.  In the Bourne shell and variants such as <SPAN
CLASS="APPLICATION"
>ksh</SPAN
> and <SPAN
CLASS="APPLICATION"
>bash</SPAN
>, to set
				<CODE
CLASS="ENVAR"
>SYBASE</CODE
> and <CODE
CLASS="ENVAR"
>TDSVER</CODE
> do:
				
<PRE
CLASS="SCREEN"
>	<SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>export SYBASE=/usr/local/freetds</KBD
>  # (or your favorite directory)
	<SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>export TDSVER=4.2</KBD
></PRE
></P
><P
>In <SPAN
CLASS="APPLICATION"
>csh</SPAN
>:
				
<PRE
CLASS="SCREEN"
>	<SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>setenv SYBASE /usr/local/freetds</KBD
>
	<SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>setenv TDSVER 4.2</KBD
></PRE
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="CHECKING"
>Checking your work</A
></H2
><P
>When you're done, you should see something very like this:
				
<PRE
CLASS="SCREEN"
>	<SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>ls $SYBASE</KBD
>
	<SAMP
CLASS="COMPUTEROUTPUT"
>etc include interfaces lib</SAMP
></PRE
></P
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>The <TT
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>locales.conf</TT
> file</TD
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Code Editor : envvar.htm