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GetEnv

access shell variables
Syntax 

GetEnv(S:STRING):STRING

Description
This function returns the value of system shell variables

Example 
  GetEnv("HOME");
/Users/bigatti
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  GetEnv("COCOARC");
/Users/bigatti/.cocoarc
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  GetEnv("COCOA_PACKAGES");
/Applications/CoCoA-4.7/packages
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