Windows Script Host
ExpandEnvironmentStrings Method

Returns an environment variable's expanded value.

object.ExpandEnvironmentStrings(strString)
Arguments
object

WshShell object.

strString

String value indicating the name of the environment variable you want to expand.
Remarks

The ExpandEnvironmentStrings method expands environment variables defined in the PROCESS environment space only. Environment variable names, which must be enclosed between "%" characters, are not case-sensitive.
Example

The following code expands the Windows Directory environment variable and displays it:

VBScript 
set WshShell = WScript.CreateObject("WScript.Shell")
WScript.Echo "WinDir is " & WshShell.ExpandEnvironmentStrings("%WinDir%")
JScript 
var WshShell = WScript.CreateObject("WScript.Shell");
WScript.Echo("WinDir is " + WshShell.ExpandEnvironmentStrings("%WinDir%"));

Applies To:

WshShell Object
See Also

Reference

RegRead Method
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Community Content

John Sudds
It may seem obvious but...

If the environment variable is not defined, the method cannot "expand" the value and returns a string equal to the input.

var oShell = new ActiveXObject("WScript.Shell");
var strReturn = oShell.ExpandEnvironmentStrings("%MISSING%");
WScript.Echo(strReturn);


Example output: %MISSING%

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