Note: update-grub may be a distribution-specific script (maybe specific to
Debian and derivatives).
Looking at the grub manual, I only see grub-mkconfig.
https://www.gnu.org/software/grub/manual/html_node/Invoking-grub_002dmkconfig.html
I believe the update-grub I mentioned just ends up calling it with a couple
preset arguments.
If you're using some other GNU/Linux distribution, try to find out about its
mechanism to generate GRUB's configuration.
In Debian, GRUB's configuration is generated by scripts in /etc/grub.d/
On July 17, 2015 10:08:33 PM GMT+01:00, "Joāo Ricardo Sares Teles de Matos"
<[email protected]> wrote:
>You could use the environment block:
>https://www.gnu.org/software/grub/manual/html_node/Environment-block.html
>
>But I believe that kind of logic is supposed to go into the scripts
>that generate your grub.cfg when you run update-grub, and not into the
>generated grub.cfg itself.
>
>On July 17, 2015 3:12:36 PM GMT+01:00, Marc Smith <[email protected]>
>wrote:
>>Hi,
>>
>>Looking for any possibility of reading the contents of a file (or even
>>just
>>the file name) into a variable in a GRUB config file? I've read that
>>command substitution is not supported and no plans to add it, but is
>>there
>>any other way?
>>
>>I've tried a couple other methods without success (in the grub.cfg
>>file):
>>--snip--
>>while read ver_str;
>>do
>> something_with ${ver_str}
>>done < /version_file
>>--snip--
>>
>>OR
>>
>>--snip--
>>cat /version_file | while read ver_string;
>>do
>> something_with ${ver_str}
>>done
>>--snip--
>>
>>The goal is to read a "version string" from a file at boot with GRUB
>to
>>display different menu entries for different versions, but I'd even
>>take
>>just getting the string from the file name at this point. Any ideas?
>My
>>last resort is to just use sed to modify grub.cfg when a new version
>of
>>the
>>OS is installed (for a new GRUB menu entry), but I'd prefer not to do
>>that
>>unless I have to.
>>
>>Or what about including another grub.cfg file and then in the included
>>GRUB
>>config file just have the line "set ver_str=0.1.1" -- I was thinking
>>using
>>the 'configfile' command would do this, but doesn't seem to work as I
>>expected.
>>
>>Any help or ideas would be greatly appreciated.
>>
>>
>>Thanks,
>>
>>Marc
>>
>>
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>>
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>
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