Re: [OT] export http_proxy

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

Hi,
    Sorry, I thought I had a perfect solution, but I am still not quite
    there yet. My problem is, when I do a killall -USR2 zsh, all the
    existing zsh shells will be able to catch the signal and then export
    the http_proxy properly. 
    
    Now, this fails when I open up a new xterm, is there anyway to allow
    all the zsh process to share certain shell variables?

    THanks.

Shao.

Shao Zhang [shao@linux.cia.com.au] wrote:
> 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                                                  |___/ 
> _____________________________________________________________________________

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