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.
BSD 4.3
SEE ALSO¶
getenv(3),
putenv(3),
environ(5)