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The tcopy utility copies the magnetic tape mounted
on the tape drive specified by the source argument. The
only assumption made about the contents of a tape is that there are two
tape marks at the end.
When only a source drive is specified, tcopy scans
the tape, and displays information about the sizes of records and tape files.
If a destination is specified, tcopy makes a copies the
source tape onto the destination tape, with blocking
preserved. As it copies, tcopy produces the same output
as it does when only scanning a tape.
The tcopy utility requires the use of Berkeley-compatible
device names. For example,
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example% tcopy /dev/rmt/1b /dev/rmt/2b
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