Error in running subroutine from cmd?

Dear community users,

I have a small issue which needs rectification. I'm trying to run parameter sensitivity for my analysis with user subroutine VUMAT. While running from ABAQUS/CAE user interface the analysis is running smoothly. However, when i tried to run the same using cmd or PowerShell window i get the following error, " 'LINK' is not recognized as an internal or external command,
operable program or batch file." picture attached. I partially know that i have to call Abaqus in system environment variable "path" (which i don't know how). Also, if someone can tell the exact procedure or share some screenshot that would be quite useful. 

If anyone has idea regarding this please do tell. I need to run batch file for my analysis so it is very important to me right now. 

Regards

Senthil K