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Re: Square bracket test expressions in GRUB2's scripting language undocu
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From: |
Andrey Borzenkov |
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Subject: |
Re: Square bracket test expressions in GRUB2's scripting language undocumented. |
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Date: |
Thu, 20 Jun 2013 06:11:09 +0400 |
В Wed, 19 Jun 2013 12:34:55 +0100
João Ricardo Sares Teles de Matos <address@hidden> пишет:
> Usage of the square brackets to evaluate conditional expressions, for example:
>
> if [ -s $prefix/grubenv ]; then
> load_env
> fi
>
> Is seen being used in typical GRUB 2 configurations shipped with popular
> GNU/Linux distros, but I couldn't find any documentation on the subject.
>
> The only related thing I could find was in the node 'Shell-like scripting'
> (5.2) of the manual, where the strings "[[" and "]]" are declared as reserved
> words, like in bash. But no mention of just "[" at all.
>
Thank you for the pointer, I'll check it.
> Can the documentation for the "test" command from GNU Coreutils be used
> safely for GRUB 2's "[" command?
>
It is not exactly the same, there are a couple of idfferences.
> Is this feature documented anywhere at all, outside the source?
>
It is documented in current development version.
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