Re: How to remove variable from GRUB environment block

[Ulf Zibis]

Am 12.02.2013 03:15, schrieb Andrey Borzenkov:
> В Mon, 11 Feb 2013 20:52:12 +0100
> Ulf Zibis <address@hidden> пишет:
>
> > Am 11.02.2013 17:46, schrieb Andrey Borzenkov:
> > > For all practical purposes, empty variable is the same as non-existing
> > > variable.
> > Not really, testing for non-existence would fail.
> How do you test for variable existence in grub?

I'm not clearly sure, but I see different syntax in my grub.cfg, which I interpret as "test for 
existence":

if [ x"${feature_menuentry_id}" = xy ]; then
  ...

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
fi


-Ulf