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This was tested on Ubuntu 12.04 (Precise) LTS Server. It returns the name of the symlink within /dev/disk/by-id for the physical drive you specify. Change /dev/sda to the one you want, and replace ata- with scsi- or the appropriate type for your drive.
I used this to pre-configure grub-pc during a non-interactive install because I had to tell it which disk to install grub on, and physical disks don't have a UUID such as that blkid provides.
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Substitute for #11720
Can probably be even shorter and easier.
example of the use of zsh glob qualifiers:
"@" = the symlink qualifier
"" = first element
:t = remove leading path components, leaving the tail
If you can do better, submit your command here.
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