unsetenv

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)