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Question about /etc/fstab in Squeeze

The /etc/fstab that is installed by the Debian installer
in Squeeze contains the following comment lines:

#  Use 'vol_id --uuid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).

What is 'vol_id' ? The context suggests that it is an executable
program that is run from the command line, but there is no such object
in the search PATH. And man 5 fstab brings up a man page that does not
contain the sting, vol_id. How do I use the information that this
comment seems to attempt to convey? Is the string, vol_id --uuid,
intended as the argument to some other program? What is the name of
that other program?


Paul E Condon           

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