NAME

       putenv - change or add an environment variable

SYNOPSIS

       #include <stdlib.h>
       int putenv(const char *string);

DESCRIPTION

       The  putenv()  function adds or changes the value of envi-
       ronment variables.  The argument string  is  of  the  form
       name = value.  If name does not already exist in the envi-
       ronment, then string is added to the environment.  If name
       does  exist,  then the value of name in the environment is
       changed to value.

RETURN VALUE

       The putenv() function returns zero on success, or -1 if an
       error occurs.

ERRORS

       ENOMEM Insufficient space to allocate new environment.

CONFORMING TO

       SVID 3, POSIX, BSD 4.3

SEE ALSO

       getenv(3), setenv(3), unsetenv(3)