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Subject: Environment variables with $$
Date: Fri, 26 Sep 2003 17:31:00 +0100
Message-ID: 
 <4A06D8EF24F2634398B11459B294AE5510909D@ukeuexch01.ukeu.ukeuniversitiesworldwide.com>
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Thread-Topic: Environment variables with $$
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From: "Duncan Strang" <dstrang@ukeu.com>
To: <user@ant.apache.org>
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Hi

I have an ant build script that contains the following target

   <target name=3D"init">
      <filter filtersfile=3D"${filtersfile}" />
      <tstamp>
         <format property=3D"build.sdate" pattern=3D"yyMMdd" />
      </tstamp>
      <copy todir=3D"${tmpdir}" filtering=3D"true" >
          <fileset dir=3D"${build}/packages" />
      </copy>
      <property name=3D"providers"
                =
value=3D"${portaldir}/$$DESKTOP/classes/portal/providers/"
/>
      <echo>Just set a property called providers this has the value
${providers}
   </target>

I'm trying to understand the semantics of the $$DESKTOP bit.
I have similar statements all through my 5000 line build.xml
I have been told that DESKTOP is a 'simple environment variable' however
I have set a variable in my .profile file (Solaris 8) with the value
foobar. I can access this from the shell with echo $DESKTOP, I get
foobar back
When I run the init target I was expecting to get
/myportal/dist/foobar/classes/portal/providers/
Instead I got
/myportal/dist/$DESKTOP/classes/portal/providers/

I have the book 'Java development with ant' by Hatcher and Loughran,
they talk about using the env prefix to access environment variables. I
have searched build.xml and I can find no reference to anything that
looks like it is setting or retrieving an ev.

I have also had a look round the archives, once again all I see is the
env prefix stuff.

Can anyone explain the semantics of $$DESKTOP.

Many Thanks
Duncan

Duncan Strang
JAVA Consultant
UK eUniversities Worldwide Limited
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