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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

       getenv(3), putenv(3), environ(5)