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ltf(1)
NAME
ltf - labeled tape facility
SYNOPSIS
ltf option [keys] file...
OPTIONS
The actions of ltf are controlled by one of the following option characters
that must appear as the first command-line argument: -c, -H, -t, -x, and
-i.
-c Creates a new volume assigning an interchange file name to the files on
the volume, that is, ltf initializes the volume and writes each named
file onto the output file. Then ltf assigns an interchange file name to
the files being created on the volume. This interchange file name is a
name that can be recognized by a system other than this operating
system. (Not all file names allowed in this operating system are
permissible in all forms of ANSI volumes.) This file name is 17
characters in length and includes only capital letters and the "a"
characters, which are listed in ltf(4). It is formed by converting all
lowercase letters to uppercase, converting non-"a" characters to
uppercase Z, and truncating the resultant string to 17 characters. If
ANSI Version 4 volumes are being used, the original file name is
preserved in HDR3 through HDR9 and EOF3 through EOF9. For further
information, see ltf(4).
-H Displays help messages for all options and keys.
-t Lists each named file on the specified volume. If no file argument is
given, information about all files on the volume is provided. If -t is
used without v or V (verbose keys), the interchange file names are also
included in the list.
-x Extracts each named file from the volume to the user's current
directory. If no file argument is given, the entire content of the
volume is extracted. If the p key is not specified when extracting
files from a volume written by a Tru64 UNIX system, the files are
restored to the current user and group IDs and to the mode set by the
umask(2) system call.
-i Initializes an ANSI labeled magnetic volume in accordance with the ANSI
X3.27-1978 Standard for Magnetic Tape Labels and File Structure for
Information Interchange.
KEYS
The following optional keys can be specified to enable or disable ltf
actions as specified:
a Outputs an ANSI-compatible Version 3 format volume. This key can be
used with the -c option only. The default version is 4. For further
information, see ltf(4).
h Writes to a tape volume the file that a symbolic link points to instead
of creating the symbolic link on a volume. The file written to the
tape now has the same name as the symbolic link. This key can be used
with the -c option only. When extracting, if a symbolic link exists in
the current directory that has the same name as a file on the tape
volume, the link is followed and the file that the symbolic link
currently points to is overwritten with the extracted file. To avoid
overwriting files, use the w key.
o Omits directory blocks from the output volume. When creating a volume,
the directory files are omitted, and when listing or extracting, the V
key is disabled.
O Omits usage of optional headers HDR3 through HDR9 and EOF3 through
EOF9. For further information, see ltf(4). If a file is created on a
Tru64 UNIX system without the use of the O key, these file headers
contain the complete Tru64 UNIX disk file name. Not all non-Tru64 UNIX
systems are able to process volumes containing these header labels.
Thus, it is helpful to use this qualifier to avoid unnecessary error
messages when planning to use other systems.
p Restores files to original mode, user ID and group ID that is written
on the tape volume. This key can be used with the -x option on Tru64
UNIX files and by the superuser only.
v Displays long form information about volume and files. Normally, ltf
operates with little terminal output.
When used in conjunction with the -t option, v gives more information
about the volume entries than when used in conjunction with the -c and
-x options. The following line is typical output from -tv functions.
ltf: Volume ID is: ULTRIX Volume is: ANSI Version #4
ltf: Owner ID is: OwnerID
ltf: Implementation ID is: SystemID
ltf: Volume created on: System
t(1,1) rw-r--r-- 103/3 owner Feb 2 12:34 2530 bytes <cc >D file1
t(2,1) rw-r--r-- 103/3 owner Jun 29 09:34 999 bytes <com>D file2
t(3,1) rwxrwxrwx 293/10 name Jan 24 10:20 1234 bytes <bin>F name
t(4,1) --xrwx--- 199/04 theowner Jan 24 10:21 12345 bytes <asc>D
long file name
The first field contains the file sequence number and the file section
number of the file. If a Tru64 UNIX system created the labeled volume,
the second and third fields contain the mode, and owner/group ID of the
file. Otherwise, these two fields are filled with dashes. The fourth
field contains the file owner name. The fifth field contains latest
modification time. The year is included if the modification time is
older than Jan 1 of the current year. The sixth field contains the
number of bytes used on the volume for the file. If the volume is from
a system other than Tru64 UNIX, this field contains the number of
blocks with the block size in parentheses. The seventh field contains
the ANSI file type (angle brackets) and the file record format (one
character suffix). The file record formats are: F (fixed length), D
(variable length), or S (spanned/segmented records). The eighth (last)
field contains the name of the file. If the file name does not fit
within the 12 spaces left in the line, the name appears on the next
line preceded by a carriage return. A long file name will be continued
over one or more lines thus it is recommended to keep auto wrap on in
the terminal setup. Also if a file on a volume is either a symbolic or
hard link, information about the linked file is displayed on the next
line, preceded by a carriage return.
V Displays verbose information about directories.
w Warns the user if file name is in danger of being truncated when using
-c or if it could be overwritten using -x. Normally, ltf operates
silently and does not let the user know what is happening. When -cw is
specified, ltf displays two warning messages if the interchange name
and the Tru64 UNIX file name are not the same. When -xw is specified,
ltf displays a warning message if a file is about to be overwritten.
Another message is displayed asking for approval to overwrite the file.
If the user types no or presses Return, the option exists to enter a
new file name or press Return to quit. If a new file name is entered,
this name is also checked. Thus, ltf does not continue until a unique
file name is entered. When -x is specified, ltf does not warn the user
if a directory name already exists.
0 ... 31
Selects a unit number for a named tape device. These unit numbers can
be entered when using the default tape name, /dev/tape/tape0_d0.
The following optional keys require an additional argument to be specified
on the command line. If two or more of these keys are used, their
respective arguments are to appear in the exact order that the keys are
specified.
B size
Sets the blocking factor to size. This specifies the maximum number of
bytes that can be written in a block on a volume. If no value is
specified, size defaults to 2048 bytes. The maximum size is 20480 bytes
and the minimum size is 18 bytes. The B key need only be specified with
-c.
The size value may be specified as n bytes, (where n is assumed to be
decimal) or as nb, (a multiple of 512 bytes using n followed by b,
where b signifies the multiple of 512) or as nk, (a multiple of 1024
bytes using n followed by k, where k signifies the multiple of 1024).
f device
Sets the device file name to device. The default is
/dev/tape/tape0_d0. The use of the f key overrides the 0 ... 31 keys.
I file
Allows file name to be supplied either interactively or from a
specified file. Normally, ltf expects the argument file names to be
part of the command line. The I key allows the user to enter argument
file names either interactively or from a specified file. If file is a
dash (-), ltf reads standard input and prompts for all required
information. All of the file names are requested first, followed by a
single return before the arguments are processed. If file is a valid
file name, the specified file is opened and read to obtain argument
file names.
L label
Specifies a six-character volume identifier. The default label for
Tru64 UNIX systems is "ULTRIX".
P position
Specifies file sequence and section number at which volume will be
positioned, using #,#. The first #, represents the file sequence
number, while second #, the file section number. The file sequence
number begins at 1 and is incremented for each file in the current file
set. Since this implementation of ltf only produces one file set, the
file sequence number for volumes written with this implementation is
the number of the file as it is written on the volume. The file
section number begins at 1 and is incremented for each file section on
any one volume. This number is necessary when files are written in
multi-volume format where the need may exist to split a file across
volumes; however since this implementation of ltf writes only single
volumes, the file section number is always 1 for volumes written with
this implementation.
If no file arguments are specified, all files from the position number
to the end of the tape are listed or extracted. Otherwise, particular
files that exist between the position number and the end of the tape
can be listed or extracted. A warning message appears if a file is
requested that exists before the position number specified. The P key
cannot be used with the -c option.
DESCRIPTION
The ltf command reads and writes single-volume Versions 3 and 4 ANSI-
compatible tape volumes. The file argument specifies each file or directory
name that is to be processed. If a directory name is specified, the
complete directory tree is processed.
RESTRICTIONS
The ltf command does not support floppy diskettes or multi-volume tapes.
ERRORS
Diagnostics are written to the standard error file. They come in four
forms: fatal errors, warnings, information, and prompts. The ltf command
terminates when it detects that a fatal error has occurred.
The diagnostics are intended to be self-explanatory. Their general format
is:
ltf: FATAL > a fatal error message
ltf: Warning > a warning or advisory message
ltf: Info > an information message
ltf: a prompt asking for input
EXAMPLES
This example creates a new volume for file1, file2, and file3 using device
/dev/tape/tape0_d0 (f key) and a blocking factor of 100 (B key).
ltf -cfB /dev/tape/tape0_d0 100 file1 file2 file3
SEE ALSO
ltf(4)
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Index for
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Alphabetical
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