xref: /freebsd/usr.bin/tcopy/tcopy.1 (revision e4e9813eb92cd7c4d4b819a8fbed5cbd3d92f5d8)
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32.\"     @(#)tcopy.1	8.2 (Berkeley) 4/17/94
33.\" $FreeBSD$
34.\"
35.Dd April 17, 1994
36.Dt TCOPY 1
37.Os
38.Sh NAME
39.Nm tcopy
40.Nd copy and/or verify mag tapes
41.Sh SYNOPSIS
42.Nm
43.Op Fl cvx
44.Op Fl s Ar maxblk
45.Oo Ar src Op Ar dest
46.Oc
47.Sh DESCRIPTION
48The
49.Nm
50utility is designed to copy magnetic tapes.
51The only assumption made
52about the tape is that there are two tape marks at the end.
53The
54.Nm
55utility with only a source tape
56.Pf ( Ar /dev/sa0
57by default) specified will print
58information about the sizes of records and tape files.
59If a destination
60is specified a copy will be made of the source tape.
61The blocking on the
62destination tape will be identical to that used on the source tape.
63Copying
64a tape will yield the same output as if just printing the sizes.
65.Pp
66Options:
67.Bl -tag -width s_maxblk
68.It Fl c
69Copy
70.Ar src
71to
72.Ar dest
73and then verify that the two tapes are identical.
74.It Fl s Ar maxblk
75Specify a maximum block size,
76.Ar maxblk .
77.It Fl v
78Given the two tapes,
79.Ar src
80and
81.Ar dest
82verify that they are identical.
83.It Fl x
84Output all informational messages to the standard error.
85This option is useful when
86.Ar dest
87is
88.Pa /dev/stdout .
89.El
90.Sh SEE ALSO
91.Xr mtio 4
92.Sh HISTORY
93The
94.Nm
95command appeared in
96.Bx 4.3 .
97.Sh BUGS
98.Bl -item
99.It
100Writing an image of a tape to a file does not preserve much more than
101the raw data.
102Block size(s) and tape EOF marks are lost which would
103otherwise be preserved in a tape-to-tape copy.
104.It
105EOD is determined by two sequential EOF marks with no data between.
106There are old systems which typically wrote three EOF's between tape
107files.
108The
109.Nm
110utility will erroneously stop copying early in this case.
111.It
112When using the copy/verify option \-c
113.Nm
114does not rewind the tapes prior to start.
115A rewind is performed
116after writing prior to the verification stage.
117If one does not start
118at BOT then the comparison may not be of the intended data.
119.El
120