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`-c' CACHE-INTERVAL
===================
Selects the period, in seconds, for which a name is cached by Amd.
If no reference is made to the volume in this period, Amd discards the
volume name to filesystem mapping.
Once the last reference to a filesystem has been removed, Amd
attempts to unmount the filesystem. If the unmount fails the interval
is extended by a further period as specified by the `-w' command line
option or by the `utimeout' mount option.
The default "cache-interval" is 300 seconds (five minutes).