Hi,

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")
}
else
{
      [Environment]::SetEnvironmentVariable("PSModulePath ", ([string]::Join(";",@($myPowershellModulePathes,"D:\MyModules"))) ,"user")
}

Michael