Most modern operating systems support environment variables that associate
strings (“variables”) with other strings
(“values”). These variables are somewhat similar to the
SPECIAL
variables in Common Lisp: their values are inherited by the
processes from their parent process.
You can access your OS environment variables using the function
(
,
where EXT:GETENV
&OPTIONAL
string
)string
is the name of the environment variable.
When string
is omitted or NIL
, all the environment variables and their values
are returned in an association list.
You can change the value of existing environment variables or create new ones
using (
.
SETF
(EXT:GETENV
string
) new-value
)
These notes document CLISP version 2.49 | Last modified: 2010-07-07 |