How to write service scripts in shell

[xi...@sky-data.cn]

Hi! 





I am new about ambari and want to add customized services. 

I am used to writing scripts in shell. 


I read docs at ambari and seems that ambari support use shell to write service scripts. But i do not find any examples. All service scripts in ambari repo are in python. 

Could someone know how to use shell to write service scripts for ambari? Or somewhere can get examples? 




Thanks 


Dai