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28 .\" @(#)tcopy.1 8.2 (Berkeley) 4/17/94
36 .Nd copy and/or verify mag tapes
46 utility is designed to copy magnetic tapes.
47 The only assumption made
48 about the tape layout is that there are two sequential EOF marks
53 information about the sizes of records and files found
56 tape, or on the tape specified by the
59 If a destination tape is also specified by the
61 argument, a copy of the source tape will be made.
63 destination tape will be identical to that used on the source tape.
65 a tape will yield the same program output as if just printing the sizes.
67 The following options are available:
68 .Bl -tag -width ".Fl s Ar maxblk"
74 and then verify that the two tapes are identical.
76 Specify a maximum block size,
83 verify that they are identical.
85 Output all informational messages to the standard error
86 instead of the standard output.
87 This option is useful when
103 Writing an image of a tape to a file does not preserve much more than
105 Block size(s) and tape EOF marks are lost which would
106 otherwise be preserved in a tape-to-tape copy.
108 End of data (EOD) is determined by two sequential EOF marks
109 with no data between them.
110 There used to be old systems which typically wrote three EOF's between tape
114 utility will erroneously stop copying early in this case.
116 When using the copy/verify option
119 does not rewind the tapes prior to start.
120 A rewind is performed
121 after writing, prior to the verification stage.
122 If one does not start
123 at the beginning-of-tape (BOT) then the comparison
124 may not be of the intended data.