redhat man page for setenv

SETENV(3)						     Linux Programmer's Manual							 SETENV(3)

NAME
       setenv - change or add an environment variable

SYNOPSIS
       #include <stdlib.h>

       int setenv(const char *name, const char *value, int overwrite);

       void unsetenv(const char *name);

DESCRIPTION
       The  setenv()  function adds the variable name to the environment with the value value, if name does not already exist.	If name does exist
       in the environment, then its value is changed to value if overwrite is non-zero; if overwrite is zero,  then  the  value  of  name  is  not
       changed.

       The unsetenv() function deletes the variable name from the environment.

RETURN VALUE
       The setenv() function returns zero on success, or -1 if there was insufficient space in the environment.

CONFORMING TO
       BSD 4.3

SEE ALSO
       clearenv(3), getenv(3), putenv(3), environ(5)

BSD
								    1993-04-04								 SETENV(3)