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@(#)tcopy.1 8.2 (Berkeley) 4/17/94
$FreeBSD: head/usr.bin/tcopy/tcopy.1 57670 2000-03-01 12:20:22Z sheldonh $
.Dd April 17, 1994 .Dt TCOPY 1 .Os BSD 4.3 .Sh NAME .Nm tcopy .Nd copy and/or verify mag tapes .Sh SYNOPSIS .Nm .Op Fl cvx .Op Fl s Ar maxblk .Oo Ar src Op Ar dest .Oc .Sh DESCRIPTION .Nm Tcopy is designed to copy magnetic tapes. The only assumption made about the tape is that there are two tape marks at the end. .Nm Tcopy with only a source tape
f ( Ar /dev/rsa0 by default) specified will print information about the sizes of records and tape files. If a destination is specified a copy will be made of the source tape. The blocking on the destination tape will be identical to that used on the source tape. Copying a tape will yield the same output as if just printing the sizes.
p Options: l -tag -width s_maxblk t Fl c Copy .Ar src to .Ar dest and then verify that the two tapes are identical. t Fl s Ar maxblk Specify a maximum block size, .Ar maxblk . t Fl v Given the two tapes, .ar src and .Ar dest verify that they are identical. t Fl x Output all informational messages to the standard error. This option is useful when .Ar dest is
a /dev/stdout . .El .Sh SEE ALSO .Xr mtio 4 .Sh HISTORY The .Nm command appeared in x 4.3 . .Sh BUGS Writting an image of a tape to a file does not preserve much more than the raw data. Block size(s) and tape EOF marks are lost which would otherwise be preserved in a tape-to-tape copy. EOD is determined by two sequential EOF marks with no data between. There are old systems which typically wrote three EOF's between tape files. .Xr tcopy 1 will erroneously stop copying early in this case. When using the copy/verify option -c .Xr tcopy 1 does not rewind the tapes prior to start. A rewind is performed after writing prior to the verification stage. If one doesn't start at BOT then the comparison may not be of the intended data.