setenv.3c (2010 09)

setenv(3C) setenv(3C)

setenv(envname,envval,1);

The following code removes the variable NEWHOME from the current environment.

unsetenv("NEWHOME");

WARNINGS

The setenv() and unsetenv() functions manipulate the environment pointed to by environ , and can

be used in conjunction with

getenv(). However, envp (the third argument to main) is not changed.

The

setenv() uses malloc() to enlarge the environment (see malloc (3C)).

After the

setenv() or unsetenv() function is called, environment variables may not be in alphabeti-

cal order.

AUTHOR

setenv() and unsetenv() were developed by HP.