On Sun, Jul 26, 2009 at 11:34 AM, Efraim Yawitz<[email protected]> wrote: > > > On Sun, Jul 26, 2009 at 6:20 PM, Gregory Margo <[email protected]> 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?
For programs that have different behavior depending on whether or not a given environment variable exists - there are a great many programs that fall into this category. For instance... $ export PAGER='echo hello' $ man man hello $ PAGER= $ man man <... implicitly paged as though by 'cat' ...> $ unset PAGER $ man man <... implicitly paged through 'more' ...> So, you get different behavior for a non-empty environment variable, an empty environment variable, and no environment variable. ~Matt --~--~---------~--~----~------------~-------~--~----~ You received this message from the "vim_use" maillist. For more information, visit http://www.vim.org/maillist.php -~----------~----~----~----~------~----~------~--~---
