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getenv
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdlib.h>
 
  Syntax:    char *getenv( char *varname );
 
  Returns:   a pointer to the environment-table entry containing the
             current string value of <varname>, or NULL if the given
             variable is not defined.
 
  See also:  _putenv, _searchenv
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