how can one user create userlevel variable for other users - powershell

Question

A windows server has 20 users as usr01 - usr20. For particular application, each users should have user level environment variable such as LDTP_PORT but different values as 4001 for usr 1 and 4020 for usr20.
As manual process , I could log on as each user and update but not possible for 30 servers. I tried through codes but it needs explicit log in as specific user.
I look for powershell or some other way as one user (who is admin user) could set the user level variable for all other users. I do not want to work with -SID- at registry HKU as I am not sure how to map the user with SID)

Answer 1

I think, that there is one simple way, but not really elegant.
Since port number is not sensitive data (because in your case, you can easily predict other user's ports), I would just make 20 global variables, so everyone will have his own. For example:
User with username $env:userName, will have his port in $env:userNameLPTPort.
So code will be as simple as this:
$firstLPTPort = 4000
ForEach ($userName in $usersList) {
$newEnvVariableName = "env:" + $userName + "LPTPort"
#machine means that the scope is for whole machine and it wont disappear after closing the session
[System.Environment]::SetEnvironmentVariable($newEnvVariableName, $firstLPTPort, "Machine")
$firstLPTPort++
}
To confirm, that it works, use this:
echo ([System.Environment]::GetEnvironmentVariable($envName,"Machine"))
Remember that SetEnvironemtVariable function, will not throw exception, if there is already one variable with this name, but just simply overwrite the old one.
Edit:
You can also specify scope for specific user, just change this:
[System.Environment]::SetEnvironmentVariable($newEnvVariableName, $firstLPTPort, "Machine")
into this:
[System.Environment]::SetEnvironmentVariable($newEnvVariableName, $firstLPTPort, $userName)
But make sure, that $usersList contains correct user names.