Environment Variables in WSH JS

[Dr John Stockton]

In javascript executed by Windows Scripting Host, one can input via
command-line parameters : File $95.js :-
x = WScript.Argumen ts
WScript.echo("R esult:", x.length, typeof x, x[1], "OK")

Prompt>cscript //nologo $95.js 66 77 88
Result: 3 object 77 OK
The Arguments are 0-based.

Can one read/write Environment variables, and if so how? An answer for
VBscript could be useful, as well or in lieu.


Aside : <FAQENTRY> 2.11 : "over 5 years" is IMHO ambiguous. Suggest
"more than 5 years" or "for 5 years", whichever is meant.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk DOS 3.3, 6.20; Win98. ©
Web <URL:http://www.merlyn.demo n.co.uk/> - FAQqish topics, acronyms & links.
PAS EXE TXT ZIP via <URL:http://www.merlyn.demo n.co.uk/programs/00index.htm>
My DOS <URL:http://www.merlyn.demo n.co.uk/batfiles.htm> - also batprogs.htm.

[Yann-Erwan Perio]

Re: Environment Variables in WSH JS

Dr John Stockton wrote:
[color=blue]
> Can one read/write Environment variables, and if so how? An answer for
> VBscript could be useful, as well or in lieu.[/color]

Use the WshShell object to read the Environment property:

---
var ws, en, buf;

ws=WScript.Crea teObject("WScri pt.Shell");
en=new Enumerator(ws.E nvironment)
buf=[];

for(;!en.atEnd( );en.moveNext() )
buf.push(en.ite m());

WScript.Echo(bu f.join("\n"));
ws=null;
---

Reference:<URL: http://msdn.microsoft. com/library/default.asp?url =/library/en-us/script56/html/wsProEnvironmen t.asp>
Download:<URL:h ttp://msdn.microsoft. com/library/default.asp?url =/downloads/list/webdev.asp>


HTH
Yep.

[Dr John Stockton]

Re: Environment Variables in WSH JS

JRS: In article <3ffb288e$0$286 91$626a54ce@new s.free.fr>, seen in
news:comp.lang. javascript, Yann-Erwan Perio <y-e.perio@em-lyon.com>
posted at Tue, 6 Jan 2004 22:28:34 :-[color=blue]
>Dr John Stockton wrote:
>[color=green]
>> Can one read/write Environment variables, and if so how? An answer for
>> VBscript could be useful, as well or in lieu.[/color]
>
>Use the WshShell object to read the Environment property:
>
>---
>var ws, en, buf;
>
>ws=WScript.Cre ateObject("WScr ipt.Shell");
>en=new Enumerator(ws.E nvironment)
>buf=[];
>
>for(;!en.atEnd ();en.moveNext( ))
> buf.push(en.ite m());
>
>WScript.Echo(b uf.join("\n"));[/color]

Thanks; that works for me (except for buf.push), and I can also now read
in VBscript. But can Environment variables be written from these
languages? To do it in Pascal, I had to work low-level.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk DOS 3.3, 6.20; Win98. ©
Web <URL:http://www.merlyn.demo n.co.uk/> - FAQqish topics, acronyms & links.
PAS EXE TXT ZIP via <URL:http://www.merlyn.demo n.co.uk/programs/00index.htm>
My DOS <URL:http://www.merlyn.demo n.co.uk/batfiles.htm> - also batprogs.htm.

[Yann-Erwan Perio]

Re: Environment Variables in WSH JS

Dr John Stockton wrote:
[color=blue]
> But can Environment variables be written from these
> languages? To do it in Pascal, I had to work low-level.[/color]

Far from being a WSH specialist I'm afraid I cannot give you as a
definite answer about this as I'd like to. Still, some quick lookup in
the archives yielded the two following articles, which might be of
interest for you:

<URL:http://groups.google.c om/groups?hl=fr&lr =&ie=UTF-8&oe=UTF-8&selm=e52812c2 BHA.2588%40tkms ftngp07>
<URL:http://groups.google.c om/groups?hl=fr&lr =&ie=UTF-8&oe=UTF-8&selm=3F54F46F .59CADE82%40hyd ro.com>

The quick story is that you can set environment variables via WSH,
though the way you do it depends on which platforms you set the
variable, and whether you want to set it permanently.

var System=Script.C reateObject("WS cript.Shell").E nvironment("SYS TEM");
System("foo")=" bar";
WScript.Echo(Sy stem("foo"));

....should work on win2k/XP and make the variable available to other
processes/users. Using "USER" instead of "SYSTEM" makes it available to
the current user only, and using "PROCESS" makes it available to the
current process only.

Windows 95/98 only support "PROCESS", so you cannot make the variable
permanent unless using the "winset" utility.


HTH
Yep.