Maybe the following text would be better?
Instructions to unbundle and configure GlassFish
To install and configure the application server (GlassFish) you need to
have JDK 5 installed on your system. The configuration processing
depends on Ant (1.6.5). The bundle includes an Ant distribution that
has been extended with task to facilitate developing Java EE 5
applications for the application server.
1. Download one of the bundles to disk.
2. Verify that your JDK5 installation is on your PATH, ahead of any
JDK 4 installations that you might have.
3. Run:
java -Xmx256m -jar /filename.jar
This command will unbundle the distribution and create a new
directory structure rooted under a directory named 'glassfish'.
4.
cd glassfish
5. If you are using a machine with an operating system that is a
derivative of UNIX(tm), set the execute permission for the Ant
binaries that are included with the GlassFish budle.
chmod -R +x lib/ant/bin/
6.
lib/ant/bin/ant -f setup.xml
OR
lib\ant\bin\ant -f setup.xml
To utilize the clustering support available in GlassFish V2
bundles, use the following command instead
lib/ant/bin/ant -f setup-cluster.xml
OR
lib\ant\bin\ant -f setup-cluster.xml