The MKS Toolkit gets installed as part of DataStage and that contains quite a few standard UNIX commands. Thus the answer to your question is "maybe". Do you know which commands you need to issue?
"grep" is most certainly part of the MKS Toolkit. I'm really surprised that the command wasn't found, since if the $PATH isn't set correctly for MKS toolkit then DataStage itself wouldn't run. If you search your server for "grep.exe" to find the correct directory you can then make sure that it is part of your path at runtime (look at the 1st or 2nd log entry of any job in the director to see the runtime path settings).