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Commands Reference, Volume 3
mt Command (BSD)
Purpose
Gives subcommands to streaming tape device.
Syntax
mt [ -f TapeName ] Subcommand [ Count ]
Description
The mt command gives subcommands
to a streaming tape device. If you do not specify the -f flag with the TapeName parameter, the TAPE environment variable is used. If the environment variable does not
exist, the mt command uses the /dev/rmt0.1 device. The TapeName parameter must be a raw
(not block) tape device. You can specify more than one operation with the Count parameter.
Subcommands
eof, weof |
Writes the number of end-of-file markers specified by the Count parameter at the current position on the tape. |
fsf |
Moves the tape forward the number of files specified by the Count parameter and positions it to the beginning of the next file. |
bsf |
Moves the tape backwards the number of files specified by the Count parameter and positions it to the beginning of the
last file skipped. If using the bsf subcommand would cause the tape head to
move back past the beginning of the tape, then the tape will be rewound, and
the mt command will return EIO. |
fsr |
Moves the tape forward the number of records specified by the Count parameter. |
bsr |
Moves the tape backwards the number of records specified by the Count parameter. |
rewoff1, rewind |
Rewinds the tape. The Count parameter is
ignored. |
status |
Prints status information about the specified tape device. The output
of the status command may change in future implementations. |
Flag
-f TapeName |
Specifies the TapeName parameter. |
Examples
- To rewind the rmt1
tape device, enter:
mt -f /dev/rmt1 rewind
- To move forward two files on the default tape
device, enter:
mt fsf 2
- To write two end-of-file markers on the tape
in the /dev/rmt0.6 file, enter:
mt -f /dev/rmt0.6 weof 2
Exit Status
0 |
Indicates a successful completion. |
>0 |
Indicates an error occurred. |
Files
/dev/rmt/n.n |
Specifies the raw streaming tape interface. |
/usr/bin/mt |
Contains the mt command file. |
Related Information
The tctl command.
The environment file, rmt special
file.
The ioctl subroutine.
Tape Drives in AIX 5L Version 5.2 System Management Concepts: Operating System and Devices.
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