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Feb 22nd, 2019
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  1. > set _variable=foo
  2.  
  3. > echo %_variable%
  4. foo
  5.  
  6. > setx _variable %_variable%bar
  7.  
  8. SUCCESS: Specified value was saved.
  9.  
  10. > echo %_variable%
  11. foo
  12.  
  13. Microsoft Windows [Version 6.1.7601]
  14. Copyright (c) 2009 Microsoft Corporation. All rights reserved.
  15.  
  16. > echo %_variable%
  17. foobar
  18.  
  19. setx _variable.old %_variable%
  20. reg delete HKCUEnvironment /F /V _variable
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