[ubuntu-in] classpath in ubuntu 12.10

[Alok Singh Mahor]

Hi all,
I am not able to see value of $CLASSPATH variable.
where is the classpath vlue is saved in ubuntu 12.10?

but by -verbose option I can see the search path of class file. but class
path must must have saved somewhere so javac is looking for classes.

alok at alok:~/exp/java$ javac alok.java -verbose
[parsing started RegularFileObject[alok.java]]
[parsing completed 25ms]
[search path for source files: .]
[search path for class files:
/usr/lib/jvm/java-7-openjdk-i386/jre/lib/resources.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/rt.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/sunrsasign.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jsse.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jce.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/charsets.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/netx.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/plugin.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/rhino.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jfr.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/classes,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/zipfs.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/sunjce_provider.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/sunpkcs11.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/pulse-java.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/dnsns.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/java-atk-wrapper.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/localedata.jar,.]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]
[checking alok]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/lang/AutoCloseable.class)]]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/lang/System.class)]]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/io/PrintStream.class)]]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/io/FilterOutputStream.class)]]
[loading
ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym(META-INF/sym/rt.jar/java/io/OutputStream.class)]]
[wrote RegularFileObject[alok.class]]
[total 256ms]

by seeing the output i can tell that classpath is
/usr/lib/jvm/java-7-openjdk-i386/jre/lib/*:.
but where this value is stored so javac is looking at these paths?
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