sfdx force:user:permset:assign

Assign a permission set to one or more users of an org


--jsonFormat output as json
--loglevel <loglevel>Logging level for this command invocation
-u, --targetusername <targetusername>Username or alias for the target org; overrides default target org
--apiversion <apiversion>Override the api version used for api requests made by this command
-n, --permsetname <permsetname>Comma-separated list of permission sets to assign
-o, --onbehalfof <onbehalfof>Comma-separated list of usernames or aliases to assign the permission set to