Hello Pankaj,
so with "arsdoc get" you can retrieve 1 or many documents in one shot.
your command will work.
If you want to get all documents that are linked to a LoadId, then you could use this command:
arsdoc get -h CMODInstance -G AppGroup -X LoadId -v -o "Name"
for example (or add the option -N to have the appgroup and app in the filename).
Cheers,
Alessandro