Re: [OT] export http_proxy

[Shao Zhang <shao@linux.cia.com.au>]

Bart Schaefer [schaefer@brasslantern.com] wrote:
> On Fri, 16 Jun 2000, Shao Zhang wrote:
> 
> >     I have a couple of isps on my linux box, and some of them need a
> >     proxy setting. So nearly everytime I dial up, I have to export the
> >     http_proxy in order to use it. Now is there an easy/smart way to do
> >     this rather than doing it manually?
> 
> Use the `preexec' user-defined function.  You need to devise a test that
> zsh can use to determine to which ISP you're presently connected; perhaps
> something like
> 
>     function preexec() {
> 	case ${${(M)$(ifconfig ppp0):#addr:*}#addr:} in
> 	192.168.68.1) export HTTP_PROXY=192.168.68.215;;
> 	192.168.86.9) typeset +x HTTP_PROXY; unset HTTP_PROXY;;
> 	and-so-on) export HTTP_PROXY=and-so-forth;;
> 	esac
>     }
> 
> However, it might be a bit expensive to run ifconfig before each and every
> command, so you might instead try putting it in the `periodic' function
> (so it gets updated every $PERIOD seconds, which you also need to set).

    Thanks. I don't know both preexec and periodic before, it is very
    usefull to know for my other stuff. But preexec is a bit expensive,
    and periodic does not really fit well since I only really need to
    update the proxy settings once.

> Or you could put it in a trap handler for e.g the USR2 signal and have a
> script that runs when PPP comes up that does a "killall -USR2 zsh" to
> cause all shells to update their environment.

    Thanks again. This is my perfect solution. Putting an extra line
    killall -USR2 zsh in the ip-up script made it all happen.

    Also, I am just wondering, are all these features unique to zsh, or
    other shells have got them as well?

    Thanks.

Shao.

-- 
____________________________________________________________________________
Shao Zhang - Running Debian 2.1  ___ _               _____
Department of Communications    / __| |_  __ _ ___  |_  / |_  __ _ _ _  __ _ 
University of New South Wales   \__ \ ' \/ _` / _ \  / /| ' \/ _` | ' \/ _` |
Sydney, Australia               |___/_||_\__,_\___/ /___|_||_\__,_|_||_\__, |
Email: shao@cia.com.au                                                  |___/ 
_____________________________________________________________________________