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115 lines
3.7 KiB
Groff
115 lines
3.7 KiB
Groff
.\" Copyright (c) 1985, 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tcopy.1 8.2 (Berkeley) 4/17/94
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.\" $FreeBSD$
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.\"
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.Dd April 17, 1994
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.Dt TCOPY 1
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.Os
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.Sh NAME
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.Nm tcopy
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.Nd copy and/or verify mag tapes
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.Sh SYNOPSIS
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.Nm
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.Op Fl cvx
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.Op Fl s Ar maxblk
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.Oo Ar src Op Ar dest
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.Oc
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.Sh DESCRIPTION
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The
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.Nm
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utility is designed to copy magnetic tapes. The only assumption made
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about the tape is that there are two tape marks at the end.
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The
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.Nm
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utility with only a source tape
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.Pf ( Ar /dev/rsa0
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by default) specified will print
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information about the sizes of records and tape files. If a destination
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is specified a copy will be made of the source tape. The blocking on the
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destination tape will be identical to that used on the source tape. Copying
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a tape will yield the same output as if just printing the sizes.
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.Pp
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Options:
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.Bl -tag -width s_maxblk
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.It Fl c
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Copy
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.Ar src
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to
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.Ar dest
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and then verify that the two tapes are identical.
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.It Fl s Ar maxblk
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Specify a maximum block size,
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.Ar maxblk .
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.It Fl v
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Given the two tapes,
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.Ar src
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and
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.Ar dest
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verify that they are identical.
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.It Fl x
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Output all informational messages to the standard error.
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This option is useful when
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.Ar dest
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is
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.Pa /dev/stdout .
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.El
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.Sh SEE ALSO
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.Xr mtio 4
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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.Sh BUGS
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.Bl -item
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.It
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Writting an image of a tape to a file does not preserve much more than
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the raw data.
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Block size(s) and tape EOF marks are lost which would
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otherwise be preserved in a tape-to-tape copy.
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.It
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EOD is determined by two sequential EOF marks with no data between.
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There are old systems which typically wrote three EOF's between tape
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files.
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.Xr tcopy 1
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will erroneously stop copying early in this case.
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.It
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When using the copy/verify option \-c
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.Xr tcopy 1
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does not rewind the tapes prior to start.
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A rewind is performed
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after writing prior to the verification stage.
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If one doesn't start
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at BOT then the comparison may not be of the intended data.
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.El
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