On Sun, Jul 26, 2009 at 6:20 PM, Gregory Margo <gma...@pacbell.net> wrote:

>
> No.  Shells in general (bash,dash,ksh,zsh,tcsh,csh) allow complete
> removal of the environment variable.  Bourne-type shells use "unset"
> and C-type shells use "unsetenv" commands.
>
> OK, but why is that necessary?

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