If you don't have Showmbrs from the resource kit, use GroupList.bat. The syntax is:

GroupList GroupName OutputFileName

GroupList.bat contains:

@echo off
setlocal
if \{%1\}
\{\} goto syntax
if \{%2\}
\{\} goto syntax
set grp=%1
set file=%2
if exist %file% del /q %file%
for /f "Skip=8 Tokens=*" %%i in ('net group %grp% /domain') do set line=%%i&call :parse
endlocal
goto :EOF
:syntax
@echo Syntax GroupList GroupName OutputFileName
endlocal
goto :EOF
:strip
set short=%name%#
set short=%short:  =%
set short=%short: #=#%
set short=%short:#=%
@echo %short%>>%file%
goto :EOF
:parse
set name=%line:~0,25%
If /i "%name%" EQU "The command completed suc" goto :EOF
call :strip
set name=%line:~25,25%
if not "%name%" EQU "" call :strip
set name=%line:~50,25%
if not "%name%" EQU "" call :strip

NOTE: To enumerate a local group, create LocalGroupList.bat, replacing:

('net group %grp% /domain')

with

('net localgroup %grp%')