diff --git a/src/cli/one_helper.rb b/src/cli/one_helper.rb
index 4aebfa9215..7dcc0a8f99 100644
--- a/src/cli/one_helper.rb
+++ b/src/cli/one_helper.rb
@@ -149,30 +149,14 @@ EOT
         ########################################################################
         # Formatters for arguments
         ########################################################################
-        def to_id(name, pool=nil)
+        def to_id(name)
             return 0, name if name.match(/^[0123456789]+$/)
 
             user_flag = -2
-            pool = pool ? pool : factory_pool(user_flag)
+            pool = factory_pool(user_flag)
+            poolname = self.class.rname
 
-            rc = pool.info
-            return -1, rc.message if OpenNebula.is_error?(rc)
-
-            objects=pool.select {|object| object.name==name }
-
-            if objects.length>0
-                if objects.length>1
-                    rname = Object.const_get(self.class.name)::RESOURCE
-                    return -1, "There are multiple #{rname}s with name #{name}."
-                else
-                    result = objects.first.id
-                end
-            else
-                rname=Object.const_get(self.class.name)::RESOURCE
-                return -1,  "#{rname} named #{name} not found."
-            end
-
-            return 0, result
+            id_to_name(name, pool, poolname)
         end
 
         def self.to_id_desc
@@ -241,6 +225,25 @@ EOT
 
         private
 
+        def self.id_to_name(name, pool, ename)
+            rc = pool.info
+            return -1, rc.message if OpenNebula.is_error?(rc)
+
+            objects=pool.select {|object| object.name==name }
+
+            if objects.length>0
+                if objects.length>1
+                    return -1, "There are multiple #{ename}s with name #{name}."
+                else
+                    result = objects.first.id
+                end
+            else
+                return -1,  "#{ename} named #{name} not found."
+            end
+
+            return 0, result
+        end
+
         def retrieve_resource(id)
             resource = factory(id)
 
@@ -277,6 +280,21 @@ EOT
         end
     end
 
+    def OpenNebulaHelper.name_to_id(name, poolname, user_flag=-2)
+        client = OpenNebula::Client.new
+        # TBD user_flag
+        pool = case poolname
+        when "HOST"  then  OpenNebula::HostPool.new(client)
+        when "GROUP" then OpenNebula::GroupPool.new(client)
+        when "USER"  then OpenNebula::UserPool.new(client)
+        end
+
+        OneHelper.id_to_name(name, pool, poolname)
+    end
+
+    def OpenNebulaHelper.name_to_id_desc(poolname)
+        "OpenNebula #{poolname} name or id"
+    end
     def OpenNebulaHelper.public_to_str(str)
         if str.to_i == 1
             public_str = "Y"
diff --git a/src/cli/oneimage b/src/cli/oneimage
index 14f4043882..0e3416b60d 100755
--- a/src/cli/oneimage
+++ b/src/cli/oneimage
@@ -48,6 +48,14 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Formatters for arguments
     ########################################################################
+    set :format, :groupid, OpenNebulaHelper.name_to_id_desc("GROUP") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "GROUP")
+    end
+
+    set :format, :userid, OpenNebulaHelper.name_to_id_desc("USER") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "USER")
+    end
+
     set :format, :imageid, OneImageHelper.to_id_desc do |arg|
         helper.to_id(arg)
     end
@@ -63,13 +71,13 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Commands
     ########################################################################
-    command :chgrp, 'Changes the Image group',[:range, :imageid_list], :text do
+    command :chgrp, 'Changes the Image group',[:range, :imageid_list], :groupid do
         helper.perform_actions(args[0],options,"User/Group changed") do |image|
             image.chown(-1, args[1].to_i)
         end
     end
 
-    command :chown, 'Changes the Image owner and group', [:range, :imageid_list], :text, [:text,nil] do
+    command :chown, 'Changes the Image owner and group', [:range, :imageid_list], :userid, [:groupid,nil] do
         gid = args[2].nil? ? -1 : args[2].to_id
         helper.perform_actions(args[0],options,"Group changed") do |image|
             image.chown(args[1].to_i, gid)
diff --git a/src/cli/onetemplate b/src/cli/onetemplate
index 7f630b57bb..39b8e69750 100755
--- a/src/cli/onetemplate
+++ b/src/cli/onetemplate
@@ -48,6 +48,14 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Formatters for arguments
     ########################################################################
+    set :format, :groupid, OpenNebulaHelper.name_to_id_desc("GROUP") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "GROUP")
+    end
+
+    set :format, :userid, OpenNebulaHelper.name_to_id_desc("USER") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "USER")
+    end
+
     set :format, :templateid, OneTemplateHelper.to_id_desc do |arg|
         helper.to_id(arg)
     end
@@ -63,13 +71,13 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Commands
     ########################################################################
-    command :chgrp, 'Changes the Template group',[:range, :templateid_list], :text do
+    command :chgrp, 'Changes the Template group',[:range, :templateid_list], :groupid do
         helper.perform_actions(args[0],options,"User/Group changed") do |t|
             t.chown(-1, args[1].to_i)
         end
     end
 
-    command :chown, 'Changes the Template owner and group', [:range, :templateid_list], :text, [:text,nil] do
+    command :chown, 'Changes the Template owner and group', [:range, :templateid_list], :userid, [:groupid,nil] do
         gid = args[2].nil? ? -1 : args[2].to_id
         helper.perform_actions(args[0],options,"Group changed") do |t|
             t.chown(args[1].to_i, gid)
diff --git a/src/cli/oneuser b/src/cli/oneuser
index cb54b37636..17b6e7fd32 100755
--- a/src/cli/oneuser
+++ b/src/cli/oneuser
@@ -64,6 +64,10 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Formatters for arguments
     ########################################################################
+    set :format, :groupid, OpenNebulaHelper.name_to_id_desc("GROUP") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "GROUP")
+    end
+
     set :format, :userid, OneUserHelper.to_id_desc do |arg|
         helper.to_id(arg)
     end
@@ -83,7 +87,7 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Commands
     ########################################################################
-    command :chgrp, 'Changes the User group',[:range, :userid_list], :text do
+    command :chgrp, 'Changes the User group',[:range, :userid_list], :groupid do
         helper.perform_actions(args[0],options,"User/Group changed") do |user|
             user.chown(-1, args[1].to_i)
         end
diff --git a/src/cli/onevm b/src/cli/onevm
index 3d6d7bbccb..2ae6a3a67e 100755
--- a/src/cli/onevm
+++ b/src/cli/onevm
@@ -44,6 +44,18 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Formatters for arguments
     ########################################################################
+    set :format, :hostid, OpenNebulaHelper.name_to_id_desc("HOST") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "HOST")
+    end
+
+    set :format, :groupid, OpenNebulaHelper.name_to_id_desc("GROUP") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "GROUP")
+    end
+
+    set :format, :userid, OpenNebulaHelper.name_to_id_desc("USER") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "USER")
+    end
+
     set :format, :vmid, OneVMHelper.to_id_desc do |arg|
         helper.to_id(arg)
     end
@@ -65,13 +77,13 @@ cmd=CommandParser::CmdParser.new(ARGV) do
         end
     end
 
-    command :chgrp, 'Changes the Virtual Machine group',[:range, :vmid_list], :text do
+    command :chgrp, 'Changes the Virtual Machine group',[:range, :vmid_list], :groupid do
         helper.perform_actions(args[0],options,"User/Group changed") do |vm|
             vm.chown(-1, args[1].to_i)
         end
     end
 
-    command :chown, 'Changes the Virtual Machine owner and group', [:range, :vmid_list], :text, [:text,nil] do
+    command :chown, 'Changes the Virtual Machine owner and group', [:range, :vmid_list], :userid, [:groupid,nil] do
         gid = args[2].nil? ? -1 : args[2].to_id
         helper.perform_actions(args[0],options,"Group changed") do |vm|
             vm.chown(args[1].to_i, gid)
@@ -92,7 +104,7 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     end
 
     # TBD hostid instead of text in the second argument
-    command :deploy, 'Deploy a Virtual Machine', [:range,:vmid_list], :text do
+    command :deploy, 'Deploy a Virtual Machine', [:range,:vmid_list], :hostid do
         host_id = args[1]
         verbose = "deploying in host #{host_id}"
 
diff --git a/src/cli/onevnet b/src/cli/onevnet
index 8132b4ef67..ca76e7b536 100755
--- a/src/cli/onevnet
+++ b/src/cli/onevnet
@@ -44,6 +44,14 @@ cmd=CommandParser::CmdParser.new(ARGV) do
     ########################################################################
     # Formatters for arguments
     ########################################################################
+    set :format, :groupid, OpenNebulaHelper.name_to_id_desc("GROUP") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "GROUP")
+    end
+
+    set :format, :userid, OpenNebulaHelper.name_to_id_desc("USER") do |arg|
+        OpenNebulaHelper.name_to_id(arg, "USER")
+    end
+
     set :format, :vnetid, OneVNetHelper.to_id_desc do |arg|
         helper.to_id(arg)
     end
@@ -66,13 +74,13 @@ cmd=CommandParser::CmdParser.new(ARGV) do
         end
     end
 
-    command :chgrp, 'Changes the Virtual Network group',[:range, :vnid_list], :text do
+    command :chgrp, 'Changes the Virtual Network group',[:range, :vnid_list], :groupid do
         helper.perform_actions(args[0],options,"User/Group changed") do |vn|
             vn.chown(-1, args[1].to_i)
         end
     end
 
-    command :chown, 'Changes the Virtual Network owner and group', [:range, :vnid_list], :text, [:text,nil] do
+    command :chown, 'Changes the Virtual Network owner and group', [:range, :vnid_list], :userid, [:groupid,nil] do
         gid = args[2].nil? ? -1 : args[2].to_id
         helper.perform_actions(args[0],options,"Group changed") do |vn|
             vn.chown(args[1].to_i, gid)