Use this command to build an RPM if you have a Spec File

rpmbuild -ba SPEC_FILE

This shell script will create a build of a firefox extension in linux. This is created according to my details(eg, the guid has @binnyva.com in it) - but you can modify it and use it yourself.

app=$1
folder=$2

if [ $# -eq 0 ] ; then
	echo "Useage: sh build.sh  []"

elif [ $# -eq 1 ] ; then
	folder="$1@binnyva.com/"
fi

rm $app.xpi
cp -r $folder temp
cd temp
rm -rf .git

zip -r $app.xpi .>/dev/null
mv $app.xpi ..
cd ..
rm -rf temp
echo "Built $app successfully"

The build.xml file to concatenate files using ant. This can be executed using the command ‘ant “ConcatAll”‘

<?xml version="1.0" encoding="UTF-8"?>
<project name = "MyProj" basedir = "." >

	<target name = "ConcatAll" >
		<concat destfile = "final.txt" fixlastline = "yes" >
			<filelist dir = "."
						files = "first_file.txt
								second_file.txt
								third_file.txt"/>
		</concat>
	</target>

</project>