Documented in Volume 1 of the UNIX Programmers Manual.
% mt -f /dev/rmt12 offl
will rewind and unload the tape mounted on logical drive 0 (/dev/rmt0);
(see "dd" for using rmt 8,9,12 and 13...)
% mt -f /dev/rmt0 fsf 2
will move the mounted tape on unit 0 forward two files (fsf is "forward
space file").
The following directives (such as fsf) are recognized:
eof write N end-of-file marks
fsf space forward N files
fsr space forward N records
bsf space backward N files
bsr space backward N records
rew rewind tape
offl rewind tape and go offline
See also dd.
NOTE: at some installations, resides in /usr/local/mt