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Re: [vox-tech] Calling a shell pgm from perl to change ENV
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Re: [vox-tech] Calling a shell pgm from perl to change ENV



Is this only a perl thing?

Cause I can have 2 shell programs and from the 1st shell program, I can
"source" the 2nd and change the parent's shell.

Jay

----- Original Message -----
From: <jdnewmil@dcn.davis.ca.us>
To: <vox-tech@franz.mother.com>
Sent: Wednesday, July 11, 2001 8:18 PM
Subject: Re: [vox-tech] Calling a shell pgm from perl to change ENV


> On Wed, 11 Jul 2001, Nicole Carlson wrote:
>
> > On Wed, 11 Jul 2001, Foo Lim wrote:
> > > Sorry, I can't help you any more than that, I'm afraid.  Child
processes
> > > should inherit the environment from the parent, but can't change the
> > > environment of the parent, which makes sense when you think about
> > > programming the UNIX environment.
> > >
> > > Anyone else wanna take a stab at this?
> >
> > I think you're right, Foo.  IIRC, the *only* thing shared between parent
> > and child processes is file descriptors.  Everything else is copied, and
> > changes to the child's environment will not affect the parent.
>
> Check.
>
> > WARNING: ugly and untested idea.  Perhaps your Perl script could rewrite
> > and re-source the .login or .bashrc or .whatever file?
>
> The only way you can change the parent's environment is to have the parent
> receive suggested changes and process them itself.  Communicating those
> changes through changes to .login or .bashrc would seem inappropriate, but
> a dedicated file could be used.  The parent could even specify the name of
> the file, created for the purpose.
>
> Somehow, I don't think this is the answer Jay wants, though.  Dem's da
> breaks. :)
>
> --------------------------------------------------------------------------
-
> Jeff Newmiller                        The     .....       .....  Go
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> DCN:<jdnewmil@dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
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>                                       Live:   OO#.. Dead: OO#..  Playing
> Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
> /Software/Embedded Controllers)               .OO#.       .OO#.
rocks...2k
> --------------------------------------------------------------------------
-


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