Use ANT to Build a JAR with version/build number

<target name="jar">
   <delete file="hello.jar"/>
   <property name="version.num" value="1.00"/>
   <buildnumber file="build.num"/>
   <tstamp>
     <format property="TODAY" pattern="yyyy-MM-dd HH:mm:ss" />
   </tstamp>

   <manifest file="MANIFEST.MF">
      <attribute name="Built-By" value="${user.name}"/>
      <attribute name="Main-Class" value="howto.Hello"/>
      <attribute name="Implementation-Version" 
             value="${version.num}-b${build.number}"/>   
      <attribute name="Built-Date" value="${TODAY}"/>                 
  </manifest>

  <jar destfile="hello.jar"
       basedir="."
       includes="**/*.class"
       manifest="MANIFEST.MF"
       />
</target>

tcptrack

tcptrack is a sniffer which displays information about TCP connections it
sees on a network interface. It passively watches for connections on the
network interface, keeps track of their state and displays a list of
connections in a manner similar to the unix ‘top’ command. It displays
source and destination addresses and ports, connection state, idle time, and
bandwidth usage. The following screenshot explains a lot: