C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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_putenv
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdlib.h>
 
  Syntax:    int _putenv( char *envstring );
 
  Returns:   0 if successful, or -1 if not.
 
  See also:  getenv, _searchenv
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