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28 .\" @(#)tcopy.1 8.2 (Berkeley) 4/17/94
29 .\" $FreeBSD: src/usr.bin/tcopy/tcopy.1,v 1.7.2.5 2003/02/24 23:04:39 trhodes Exp $
30 .\" $DragonFly: src/usr.bin/tcopy/tcopy.1,v 1.2 2003/06/17 04:29:32 dillon Exp $
37 .Nd copy and/or verify mag tapes
47 utility is designed to copy magnetic tapes. The only assumption made
48 about the tape is that there are two tape marks at the end.
51 utility with only a source tape
53 by default) specified will print
54 information about the sizes of records and tape files. If a destination
55 is specified a copy will be made of the source tape. The blocking on the
56 destination tape will be identical to that used on the source tape. Copying
57 a tape will yield the same output as if just printing the sizes.
60 .Bl -tag -width s_maxblk
66 and then verify that the two tapes are identical.
68 Specify a maximum block size,
75 verify that they are identical.
77 Output all informational messages to the standard error.
78 This option is useful when
93 Writing an image of a tape to a file does not preserve much more than
95 Block size(s) and tape EOF marks are lost which would
96 otherwise be preserved in a tape-to-tape copy.
98 EOD is determined by two sequential EOF marks with no data between.
99 There are old systems which typically wrote three EOF's between tape
102 will erroneously stop copying early in this case.
104 When using the copy/verify option \-c
106 does not rewind the tapes prior to start.
107 A rewind is performed
108 after writing prior to the verification stage.
110 at BOT then the comparison may not be of the intended data.