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1.display all env vars in cmd
#set

2.echo specific env var value in cmd
ex.QMAKESPEC
#echo %QMAKESPEC%

3.set specific env var in cmd
ex.QMAKESPEC
#set QMAKESPEC=win32-msvc2010

4.append value into specific env var in window
ex.PATH
right-click on "my computer"-> content ->Advanced-> Environment variables
find "PATH" and append the path you need



ref:
http://itgroup.blueshop.com.tw/tigerlin901/ptit?n=convew&i=3887




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