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Dec 9th, 2016
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  1. @echo off & setlocal enableDelayedExpansion
  2.  
  3. set x=Hello World
  4. set "openLib=( ren "%~nx0" orig-main.bat & ren library.bat "%~nx0""
  5. set "closeLib=ren "%~nx0" library.bat & ren orig-main.bat "%~nx0" )"
  6.  
  7. :main
  8. cls
  9. %openLib%
  10. call :length "%x%" lenX
  11. %closeLib%
  12.  
  13. echo %lenX%
  14.  
  15. pause
  16. exit
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