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Environment variables & system privilages


I have two seemingly simple questions that I just can't find the answers to. Any assistance would be appreciated


1. What's the "right" way to add add environment variables into the user and system maps?
Currently I am using regtool to manipulate the registry. For instance to set an environment variable FOO=BAR I do:


regtool set -s '\HKEY_CURRENT_USER\Environment\FOO' 'BAR'
or
regtool set -s 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\FOO' 'BAR'


The first form places it in the user's map, the second in the system map. But will this work across patform? Is there a more preferred method?



2. How can I test whether my script is running with system privilages?
ie I want to write a script that installs a mount and sets and environment variable. If the script is running with system privilages I want to make the change system wide. Otherwise, in the user's profile.


#!/bin/sh
if [ ??????? ]
then
# Sytem wide
mount -tfs d:/projects /projects
regtool set -s 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\FOO' 'BAR'
else
# User ony
mount -tfu d:/projects /projects
regtool set -s '\HKEY_CURRENT_USER\Environment\FOO' 'BAR'
fi



What do I put in place of the ??????


Thanks.

Jason


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