Windows: Set or edit environment variable from powershell


powershell can set,edit or delete environment variables as well as cmd.exe command line interpreter.

Powershell has no command let for this. But the .NET framework has an appropriate class [Environment].

Some examples. The environment of an user contains two parts: The user and the system part.

All variables can be shown by

PS D:\> [Environment]::GetEnvironmentVariables()

Only the user part

PS D:\> [Environment]::GetEnvironmentVariables("user")

and only the system/machine part

PS D:\> [Environment]::GetEnvironmentVariables("machine")

A single variable can be read by

PS D:\> $myPowershellModulePathes=[Environment]::GetEnvironmentVariable("PSModulePath ","user")

The method to set an environment variable is [Environment]::SetEnvironmentVariable().

For example: You want to add a additional user path, D:\MyModules, for powershell modules. Powershell reads the module pathes from the PSModulePath environment variable.

Get the current variable and add the new path

PS D:\> $myPowershellModulePathes=[Environment]::GetEnvironmentVariable("PSModulePath ","user")
PS D:\>
if( [string]::IsNullOrEmpty($myPowershellModulePathes )
      [Environment]::SetEnvironmentVariable("PSModulePath ","D:\MyModules","user")
      [Environment]::SetEnvironmentVariable("PSModulePath ", ([string]::Join(";",@($myPowershellModulePathes,"D:\MyModules"))) ,"user")


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