grub: Environment
15 GRUB environment variables
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GRUB supports environment variables which are rather like those offered
by all Unix-like systems. Environment variables have a name, which is
unique and is usually a short identifier, and a value, which is an
arbitrary string of characters. They may be set (⇒set), unset
(⇒unset), or looked up (⇒Shell-like scripting) by name.
A number of environment variables have special meanings to various
parts of GRUB. Others may be used freely in GRUB configuration files.
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