tcopy(1) [freebsd man page]

TCOPY(1)						    BSD General Commands Manual 						  TCOPY(1)

NAME

     tcopy -- copy and/or verify mag tapes

SYNOPSIS

     tcopy [-cvx] [-s maxblk] [src [dest]]

DESCRIPTION

     The tcopy utility is designed to copy magnetic tapes.  The only assumption made about the tape layout is that there are two sequential EOF
     marks at the end.	By default, the tcopy utility will print information about the sizes of records and files found on the /dev/sa0 tape, or
     on the tape specified by the src argument.  If a destination tape is also specified by the dest argument, a copy of the source tape will be
     made.  The blocking on the destination tape will be identical to that used on the source tape.  Copying a tape will yield the same program
     output as if just printing the sizes.

     The following options are available:

     -c 	Copy src to dest and then verify that the two tapes are identical.

     -s maxblk	Specify a maximum block size, maxblk.

     -v 	Given the two tapes src and dest, verify that they are identical.

     -x 	Output all informational messages to the standard error instead of the standard output.  This option is useful when dest is given
		as /dev/stdout.

SEE ALSO

     mt(1), mtio(4)

HISTORY

     The tcopy command appeared in 4.3BSD.

BUGS

     Writing an image of a tape to a file does not preserve much more than the raw data.  Block size(s) and tape EOF marks are lost which would
     otherwise be preserved in a tape-to-tape copy.

     End of data (EOD) is determined by two sequential EOF marks with no data between them.  There used to be old systems which typically wrote
     three EOF's between tape files.  The tcopy utility will erroneously stop copying early in this case.

     When using the copy/verify option -c, tcopy does not rewind the tapes prior to start.  A rewind is performed after writing, prior to the ver-
     ification stage.  If one does not start at the beginning-of-tape (BOT) then the comparison may not be of the intended data.

BSD
								 December 20, 2006							       BSD

mt(1)							      General Commands Manual							     mt(1)

NAME

       mt - magnetic tape manipulating program

SYNOPSIS

       tapename] command [count]

   Obsolescent
       tapename] command [count]

DESCRIPTION

       is used to give commands to the tape drive.  If tapename is not specified, the environment variable is used; if is not defined, the default
       drive is used.

       winds the tape in the requested direction (forward or backward), stopping after the specified count EOF marks or records  are  passed.	If
       count  is  not  specified,  one	is assumed.  Each EOF mark counts as one record.  When winding backwards, the tape always stops at the BOT
       marker, regardless of the number remaining in count.

       accepts the following commands:

	      Write	count EOF marks.

	      Forward space
			count files.

	      Forward space
			count records.

	      Backward space
			count files.

	      Backward space
			count records.

	      Rewind tape.

	      Rewind tape and go offline.

	      Seek to end of data (DDS and QIC drives only).

	      Write	count setmarks (DDS drives only).

	      Forward space
			count setmarks (DDS drives only).

	      Backward space
			count setmarks (DDS drives only).

	      Print status information about the tape drive.

	      Reserve tape drive for sole use by the host issuing the
			command (stape or estape driver only).

	      Release tape drive from sole use by the host issuing the
			command (stape or estape driver only).

       Spacing operations (back or forward space file or record) leave the tape positioned past the object being spaced to  in	the  direction	of
       motion.	That is, backspacing a file leaves the the tape positioned before the file mark, forward spacing a file leaves the tape positioned
       after the file mark.  This is consistent with all classical usage on tapes.

WARNINGS

       Only raw, no-rewind Berkeley-type devices should be specified.  This type of device will not reposition the tape upon close.  An example of
       such a device is or See mt(7) for more details.

       It is possible to wind the tape beyond the EOT marker and off the end of the reel.

       A  reservation  may  only be cleared with a release by the host that issued the original reserve. In the event that the host that holds the
       reservation is no longer available, the command may be used to reclaim the device by issuing a bus  device  reset.   See  st(1M)  for  more
       details.

       The reserve/release functionality can only be issued to drives using the or driver.

EXAMPLES

       Rewind the tape associated with the device file or (if legacy DSF is disabled):

FILES

       Raw magnetic tape interface (stape)
       Raw magnetic tape interface (estape)
       Default tape interface.
			   If legacy DSF is disabled, the default value is

AUTHOR

       was developed by the University of California, Berkeley.

SEE ALSO

       dd(1), st(1M), intro(7), mt(7).

																	     mt(1)