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Previous: Tape Positioning, Up: Many


9.5.2 The mt Utility

See Blocking Factor.

You can use the mt utility to advance or rewind a tape past a specified number of archive files on the tape. This will allow you to move to the beginning of an archive before extracting or reading it, or to the end of all the archives before writing a new one.

The syntax of the mt command is:

     mt [-f tapename] operation [number]

where tapename is the name of the tape device, number is the number of times an operation is performed (with a default of one), and operation is one of the following:

eof
weof
Writes number tape marks at the current position on the tape.
fsf
Moves tape position forward number files.
bsf
Moves tape position back number files.
rewind
Rewinds the tape. (Ignores number).
offline
rewoff1
Rewinds the tape and takes the tape device off-line. (Ignores number).
status
Prints status information about the tape unit.

If you don't specify a tapename, mt uses the environment variable TAPE; if TAPE is not set, mt uses the device /dev/rmt12.

mt returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed.

 
 
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