DOCUMENT:Q195050 10-AUG-2001 [winnt] TITLE :How to Clear Environment Variables Using Setx.exe PRODUCT :Microsoft Windows NT PROD/VER:WINNT:4.0 OPER/SYS: KEYWORDS:kbenv kbtool ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 ------------------------------------------------------------------------------- SUMMARY ======= This article describes how to use the Setx.exe tool to clear both user and system environment variables. Setx.exe is included with the Windows NT 4.0 Resource Kit. MORE INFORMATION ================ To clear an environment variable using Setx.exe at a command prompt: 1. Click Start, point to Programs, and then click Command Prompt. 2. If you want to clear a user environment variable, type the following line setx "" where is the user environment variable. 3. If you want to clear a system environment variable, type the following line setx "" -m where is the system environment variable. 4. Close the command prompt. When you use Setx.exe to clear an environment variable value, the environment variable name is not affected. Additional query words: set null ====================================================================== Keywords : kbenv kbtool Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 Version : WINNT:4.0 Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.