tapefs(1) [plan9 man page]

TAPEFS(1)						      General Commands Manual							 TAPEFS(1)

NAME

       32vfs, cpiofs, tapfs, tarfs, tpfs, v6fs, v10fs - mount archival file systems

SYNOPSIS

       fs/32vfs [ -m mountpoint ] [ -p passwd ] [ -g group ] file
       fs/cpiofs
       fs/tapfs
       fs/tarfs
       fs/tpfs
       fs/v6fs
       fs/v10fs

DESCRIPTION

       These commands interpret data from traditional tape or file system formats stored in file, and mount their contents (read-only) into a Plan
       9 file system.  The optional -p and -g flags specify Unix-format password (respectively group) files that  give	the  mapping  between  the
       numeric	user-  and  group-ID numbers on the media and the strings reported by Plan 9 status inquiries.	The -m flag introduces the name at
       which the new file system should be attached; the default is /n/tapefs.

       32vfs interprets raw disk images of 32V systems, which are ca. 1978 research Unix systems for the VAX, and also pre-FFS Berkeley  VAX  sys-
       tems (1KB block size).

       Cpiofs interprets cpio tape images (constructed with cpio's c flag).

       Tarfs interprets tar tape images.

       Tpfs interprets tp tapes from the Fifth through Seventh Edition research Unix systems.

       Tapfs interprets tap tapes from the pre-Fifth Edition era.

       V6fs interprets disk images from the Fifth and Sixth edition research Unix systems (512B block size).

       V10fs interprets disk images from the Tenth Edition research Unix systems (4KB block size).

SOURCE

       These  commands	are  constructed  in a highly stereotyped way using the files fs.c and util.c in /sys/src/cmd/tapefs, which in turn derive
       substantially from ramfs(4).

SEE ALSO

       Section 5 passim, ramfs(4).

																	 TAPEFS(1)

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