xref: /freebsd/usr.bin/tcopy/tcopy.1 (revision 71fe318b852b8dfb3e799cb12ef184750f7f8eac)
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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.  The only assumption made
51about the tape is that there are two tape marks at the end.
52The
53.Nm
54utility with only a source tape
55.Pf ( Ar /dev/rsa0
56by default) specified will print
57information about the sizes of records and tape files.  If a destination
58is specified a copy will be made of the source tape.  The blocking on the
59destination tape will be identical to that used on the source tape.  Copying
60a tape will yield the same output as if just printing the sizes.
61.Pp
62Options:
63.Bl -tag -width s_maxblk
64.It Fl c
65Copy
66.Ar src
67to
68.Ar dest
69and then verify that the two tapes are identical.
70.It Fl s Ar maxblk
71Specify a maximum block size,
72.Ar maxblk .
73.It Fl v
74Given the two tapes,
75.Ar src
76and
77.Ar dest
78verify that they are identical.
79.It Fl x
80Output all informational messages to the standard error.
81This option is useful when
82.Ar dest
83is
84.Pa /dev/stdout .
85.El
86.Sh SEE ALSO
87.Xr mtio 4
88.Sh HISTORY
89The
90.Nm
91command appeared in
92.Bx 4.3 .
93.Sh BUGS
94.Bl -item
95.It
96Writting an image of a tape to a file does not preserve much more than
97the raw data.
98Block size(s) and tape EOF marks are lost which would
99otherwise be preserved in a tape-to-tape copy.
100.It
101EOD is determined by two sequential EOF marks with no data between.
102There are old systems which typically wrote three EOF's between tape
103files.
104.Xr tcopy 1
105will erroneously stop copying early in this case.
106.It
107When using the copy/verify option \-c
108.Xr tcopy 1
109does not rewind the tapes prior to start.
110A rewind is performed
111after writing prior to the verification stage.
112If one doesn't start
113at BOT then the comparison may not be of the intended data.
114.El
115