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The entry /dev/full behaves as if it were a file on a file system that has no more
room. A write to /dev/full fails and sets errno to ENOSPC, which ordinarily indicates
that the written-to device is full.
$ cp /etc/fstab /dev/full
cp: writing '/dev/full': No space left on device
Cem Ozdogan
2007-05-16