[SOLVED] grub2 howto increment variable

Issue

The grub2 shell aims to be a minimalistic bash like shell.

But how can I increment a variable in grub2?

In bash I would do:

var=$((var+1))

or

((var=var+1))

In grub2 I get a syntax error on these calls. How can I achieve this in the grub2 shell?

Solution

Grub2 does not have builtin arithmetic support. You need to add Lua support if you want that, see this answer for details.

Answered By - Sir Athos