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### 13.2 How to specify files

There are two ways to specify files, by absolute file name and by block list.

An absolute file name resembles a Unix absolute file name, using ‘`/`’ for the directory separator (not ‘`\`’ as in DOS). One example is ‘`(hd0,1)/boot/grub/grub.cfg`’. This means the file `/boot/grub/grub.cfg` in the first partition of the first hard disk. If you omit the device name in an absolute file name, GRUB uses GRUB’s root device implicitly. So if you set the root device to, say, ‘`(hd1,1)`’ by the command ‘`set root=(hd1,1)`’ (see set), then `/boot/kernel` is the same as `(hd1,1)/boot/kernel`.

On ZFS filesystem the first path component must be volume‘`@`’[snapshot]. So ‘`/rootvol@snap-129/boot/grub/grub.cfg`’ refers to file ‘`/boot/grub/grub.cfg`’ in snapshot of volume ‘`rootvol`’ with name ‘`snap-129`’. Trailing ‘`@`’ after volume name is mandatory even if snapshot name is omitted.