1.1. help

$  etcdctl role revoke-permission --help
NAME:
        role revoke-permission - Revokes a key from a role

USAGE:
        etcdctl role revoke-permission <role name> <key> [endkey] [flags]

OPTIONS:
      --from-key[=false]        revoke a permission of keys that are greater than or equal to the given key using byte compare
  -h, --help[=false]            help for revoke-permission
      --prefix[=false]          revoke a prefix permission