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Set environmental variables

Powershell (Windows)

Set variables

Temporary

$env:TEMPORARY_VAR = "A temporary test variable"
echo $env:TEMPORARY_VAR

Forever (run terminal with admin rights)

# Set environmental variables
[Environment]::SetEnvironmentVariable("FOREVER_VAR_MACHINE", "A machine test variable", "Machine")
[Environment]::SetEnvironmentVariable("FOREVER_VAR_USER", "A user test variable", "User")
# Update them in the current terminal
$env:FOREVER_VAR_MACHINE = [System.Environment]::GetEnvironmentVariable("FOREVER_VAR_MACHINE","Machine")
$env:FOREVER_VAR_USER = [System.Environment]::GetEnvironmentVariable("FOREVER_VAR_USER","User")
# Echo them to the console
echo $env:FOREVER_VAR_MACHINE
echo $env:FOREVER_VAR_USER

Remove variables

# Set environmental variables
[Environment]::SetEnvironmentVariable("TEST_VAR_MACHINE", "A machine test variable", "Machine")
# Update it in the current terminal
$env:TEST_VAR_MACHINE = [System.Environment]::GetEnvironmentVariable("TEST_VAR_MACHINE","Machine")
# Echo them to the console
echo $env:TEST_VAR_MACHINE
# Remove variable
[Environment]::SetEnvironmentVariable("TEST_VAR_MACHINE", $null, "Machine")
# Update it in the current terminal
$env:TEST_VAR_MACHINE = [System.Environment]::GetEnvironmentVariable("TEST_VAR_MACHINE","Machine")
# Echo them to the console (Should be empty because the variable doesn't exist any more)
echo $env:TEST_VAR_MACHINE

Update variables without restarting the terminal

Update path variable:

$env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")

Update another variable you set in machine variables named MACHINE_VARIABLE:

$env:MACHINE_VARIABLE = [System.Environment]::GetEnvironmentVariable("MACHINE_VARIABLE","Machine")

Update another variable you set in user variables named USER_VARIABLE:

$env:USER_VARIABLE = [System.Environment]::GetEnvironmentVariable("USER_VARIABLE","User")