Batch Script using System Varriable for Hostname and FQDN results in large space between

Question

I have a batch script running on Windows 7 that I've created to help a physical computer, connect to his virtual cousin.  Problem is when I try to make
it use the FQDN (required by the View Client) it puts a large space between the hostname and the domain.
Result
ECHO Connecting View Client to PREFIX-SERIAL .domain.comOR"C:\Program Files\VmWare\View.exe" -Args -serverURL PREFIX-SERIAL       .domain.com
Our computers are named a combination of a prefix and the serial number.  Our virtual computer names are the same, but with a different prefix.  So my attempt was to make a connection
script, using the computer serial number.  My Process:
Setting %serial% variable.
for /F "skip=1 tokens=*" %%b in ('wmic bios get serialnumber') do if not defined serial set serial=%%b
Set %hostname% variable.
set hostname=PREFIX-%serial%
Installation command line
"C:\Program Files\VmWare\View.exe" -Args -serverURL %hostname%.domain.com
That results in the output at the beginning of my post.
I've also tried
%hostname%.%userdomain%.com
PREFIX-%serial%.%userdomain%.com
PREFIX-%serial%.domain.com
SET FQDN=.domain.com
PREFIX-%serial%%FQDN%
%hostname%%FQDN%
I also tried carets and quotes on set commands without any improvement.
I'm sure I'm missing something simple here.  Any advise?
There's no place like 127.0.0.1

Answer 1

Will something like this get you what you are looking for?
(gwmi win32_bios).SerialNumber+(gwmi WIN32_ComputerSystem).Domain
Or
$hostname=(gwmi win32_bios).SerialNumber+"."+(gwmi WIN32_ComputerSystem).Domain
Sorry just realized your looking to do this in a Batch file...so maybe something like this
@echo off
for /F "skip=1 delims=" %%j in ('powershell "[System.Net.Dns]::GetHostByName((hostname)).HostName"') do (
set Host=%%j
goto :DONE
:DONE
echo %HOST%