newlispfanclub.alh.net

Posted: **Tue Sep 02, 2008 1:36 am**

Howdy guys,

I just wanted to point something out.

(bash)
$ echo $USER
me

$ echo $HOSTNAME
the-name

(newlisp)
(env "USER")
me

(env "HOSTNAME")
nothing

And the hostname is not "nothing" :-) ("env" doesn't return anything) Why is this?

Posted: **Wed Sep 03, 2008 7:25 pm**

Which version of newLisp are you using? Because in my Linux environment:

peter[~]$ echo $USER
peter
peter[~]$ echo $HOSTNAME
solarstriker.thuis.nl
peter[~]$ newlisp
newLISP v.9.4.5 on Linux IPv4, execute 'newlisp -h' for more info.

> (env "USER")
"peter"
> (env "HOSTNAME")
"solarstriker.thuis.nl"
>

...it works as advertised....?

Peter

Posted: **Wed Sep 03, 2008 8:44 pm**

I don't think it works on all platforms...

Code: Select all

$ echo $HOSTNAME 
imac.local
$ newlisp
newLISP v.9.4.5 on OSX IPv4 UTF-8, execute 'newlisp -h' for more info.
> (env "HOSTNAME")
nil

Posted: **Thu Sep 04, 2008 3:45 am**

newLISP v.9.4.8 64-bit on Linux IPv4 UTF-8

Posted: **Thu Sep 04, 2008 5:38 am**

cormullion wrote:I don't think it works on all platforms...

It's probably not a matter of not "working", but simply not being defined on all platforms. HOSTNAME is not a default environment variable on WIN XP, for example.

But if your platform doesn't have it, you can always define it yourself.

Posted: **Thu Sep 04, 2008 11:45 am**

Its also a matter of what is passed on from the environment to the newLISP process. E.g. on Mac OS X HOSTNAME is defined when in the shell but not inside newLISP. But 'exec' can be used to still retrieve it on Unix:

Code: Select all

> (env "HOSTNAME")
nil
> (exec "echo $HOSTNAME")
("lutzmacmini")
>

On BSD like Unices like Mac OS X use the man-page for environ to find out what is available at the shell prompt:

Code: Select all

$ man environ

environ is a C variable maintained by the OS and used inside newLISP to read the environment. On Windows the same C variable is maintained.

newlispfanclub.alh.net

environment variables

environment variables