putenv

Set or reset a variable value in the environment.

int putenv (char * var);

Required Header
<stdlib.h>

Return Value

This function returns 0 if successful. -1 indicates an error.

Parameters

var

  The variable name

Remarks

The putenv function inserts or updates the variable var in the environment, with the value specified after an '=' in the variable name. A variable with the empty string after '=', or missing '=' altogether, will be removed from the environment.

Standard Library

See Also    getenv, _environ