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Length: 7603 (0x1db3)
Types: HLP, TextFile
Names: »MT.HLP«
└─⟦24d56d853⟧ Bits:30000744 8mm tape, Rational 1000, DFS, D_12_6_5 SEQ293
└─ ⟦this⟧ »MT.HLP«
└─⟦9031b0687⟧ Bits:30000407 8mm tape, Rational 1000, DFS, D_12_7_3
└─ ⟦this⟧ »MT.HLP«
MT
The MT program is a DFS based magnetic tape utility. It is used to
transfer DFS files between a DFS disk and an "MT" format tape. The
MT program utilizes the macro user interface.
Commands:
COMPARE The COMPARE command is used to compare files from
a tape with those on a DFS disk. The command requires
no arguments and will comapre all files on the
tape. The COMPARE command leaves the tape positioned
at EOT.
Switches:
/F= The /F switch allows the user to enter a single
file name specifier that will be used to selectively
compare files. Normal wildcard characters are allowed.
The default is /F=*, i.e. all files. If used,
the /F switch must be the last one in the command line.
/I Like the /V switch below however only announces filenames
that match the file name specifier (see /F switch).
/SOE The STOP ON ERROR switch will cause the program to
terminate after announcing the first non-comapre. The
default is not SOE.
/V The /V switch causes compare to display the name of each
file compared from tape. This will override the /I switch
if both are specified.
/UNLOAD The /UNLOAD switch causes the LOAD command to unload
the tape rather than leaving the tape positioned at
EOT.
/UNIT= The /UNIT= switch may be used to specify a specific
tape unit for the transfer. If the /UNIT= switch is
not present, unit zero will be used.
Examples:
MT> compare/unload/unit=1 -- compares all files from tape, then
-- unloads the tape. uses drive 1.
MT> compare/i/f=*.cli -- compares all files that end in .cli.
-- announces only those files compared.
LOAD The LOAD command is used to transfer files from
a tape to a DFS disk. The LOAD command requires
no arguments and will transfer all files on the
tape. The LOAD command leaves the tape positioned
at EOT.
Switches:
/F= The /F switch allows the user to enter a single
file name specifier that will be used to selectively
load files from the tape. Normal wildcard characters
are allowed. The default is /F=*, i.e. all files. If used,
the /F switch must be the last one in the command line.
/I Like the /V switch below however only announces filenames
that match the file name specifier (see /F switch).
/N The /N switch causes the LOAD command to read the
files from tape but not write them to disk. This
switch may be used in conjunction with the /V
switch to see what's on a tape or to position the
tape at EOT to enable appending files to an existing
tape.
/Q The /Q switch will query the user for file overwrite
permission. Default is not to query.
/SAL Stop After Load stops the tape after loading any file. Can be used
in conjunction with the /F switch ti 'walk' down the tape and load
selective files.
/V The /V switch causes the MT program to display the
name of each file read from tape. This will override
the /I switch is both are specified.
/UNLOAD The /UNLOAD switch causes the LOAD command to unload
the tape rather than leaving the tape positioned at
EOT.
/UNIT= The /UNIT= switch may be used to specify a specific
tape unit for the transfer. If the /UNIT= switch is
not present, unit zero will be used.
Examples:
MT> load/v/unload/unit=1 -- loads all files from tape, announces files
-- loaded then unloads the tape. uses drive 1.
MT> load/i/f=*.cli -- loads all files that end in .cli. announces
-- only those files loaded.
MT> load/i/q/f=*.cli -- like above with the added feature of asking
-- the user for overwrite permission if the
-- file already exists on the disk.
MT> load/i/n/f=*junk* -- lists all files that have the string "junk"
-- in their filename.
DUMP The DUMP command is used to transfer files from a DFS
disk to a tape. The DUMP command will leave the tape
positioned at EOT upon transfer of the last file. The
dump command requires at least one argument. This
argument is the file specification to dump to tape.
More than one file specification may be present on the
command line. They will be processed in the order
they appear.
Switches:
/GCR The /GCR switch will force the file to be written in GCR
format if the tape drive supports remote density
selection. The /GCR switch may only be used if the
tape is at BOT. GCR format records at 6250 bytes
per inch.
/PE The /PE switch will force the file to be written in PE
format if the tape drive supports remote density
selection. The /PE switch may only be used if the
tape is at BOT. PE format records at 1600 bytes
per inch.
/LONG_GAPS
The /LONG_GAPS switch will force the tape to be written
with long or variable interrecord gaps if the tape drive
supports remote gap selection. This will increase tape
throughput.
/SHORT_GAPS
The /SHORT_GAPS switch will force the tape to be written
with short interrecord gaps if the tape drive supports
remote gap selection. This will increase tape capacity.
/THRESHOLD=
The /THRESHOLD switch helps the MT program optimize
throughput. It requires a single argument. If a
file being DUMPed is larger than the THRESHOLD that
file will be dumped in high speed mode. If the file
is smaller it will be dumped in low speed mode. The
MT program uses reasonable defaults but the /THRESHOLD
allows the user to optimize further.
/UNIT= The /UNIT= switch may be used to specify a specific
tape unit for the transfer. If the /UNIT= switch is
not present, unit zero will be used.
/UNLOAD The /UNLOAD switch causes the LOAD command to unload
the tape rather than leaving the tape positioned at
EOT.
/V The /V switch causes the MT program to display the
name of each file read from tape.
Examples:
MT> dump/v/gcr/threshold=25/short_gaps file1,file2,*file3*
REWIND The REWIND command will reposition the tape to BOT.
Switches:
/UNIT= The user may select a unit with the /UNIT= switch.
By default unit zero is rewound.
Examples:
MT> rewind/unit=2
UNLOAD The REWIND command will reposition the tape to BOT and
then unload the tape from the drive.
Switches:
/UNIT= The user may select a unit with the /UNIT= switch.
By default unit zero is unloaded.
Examples:
MT> unload/unit=3
To append files to an existing tape type:
MT> load/n
MT> dump file1,file2
The LOAD/N command will position the tape at EOT but not transfer any data
to the disk. The dump command will then begin to transfer the specified
files to the end of the tape.