can't use "service start servicename" to manage a service

HI, all:

I have set up a new linux server with gentran services on it. On the old server, there is an script called "service" under /sbin I could use to manage all service. I can run the commands like below to manage different service.

[root@luna sbin]# history | grep service
  108  /sbin/service denyhosts status
  109  /sbin/service denyhosts stop
  123  /sbin/service denyhosts status
  124  /sbin/service denyhosts start
  300  history | grep service
  301   /sbin/service gentran stop
  330  /sbin/service gentran status
  331  /sbin/service gentran start
  332  /sbin/service gentran restart
  531  /sbin/service gentran start
  537  /sbin/service denyhosts status
  538  /sbin/service denyhosts stop
  539  /sbin/service denyhosts start
  547  /sbin/service denyhosts stop
  548  /sbin/service denyhosts status
  549  /sbin/service denyhosts start
  581  /sbin/service gentran start
  583   /sbin/service gentran stop
  619  /sbin/service gentran start
  648  /sbin/service gentran stop
  649  /sbin/service gentran start
  655  /sbin/service gentran start
  754  /sbin/service gentran start


After I set up the new server, I copied this "service" script to the new server (it's quite strange, there is a script with the same name under /sbin folder, I backuped the old one and copied the new one into this folder). However, when I issued the same commands on this new server, it doesn't work at all. Did I miss some packages which are needed by this "service" script, I am coping the script here, please advise.
service