


MT(1)		    UNIX Programmer's Manual		    MT(1)



NAME
     mt - magnetic tape manipulating program

SYNOPSIS
     mt [ -f _t_a_p_e_n_a_m_e ] _c_o_m_m_a_n_d [ _c_o_u_n_t ]

DESCRIPTION
     _M_t is used to give commands to a magnetic tape drive.  If a
     tape name is not specified, the environment variable TAPE is
     used;  if TAPE does not exist, _m_t uses the device
     /_d_e_v/_r_m_t_1_2.  Note that _t_a_p_e_n_a_m_e must reference a raw (not
     block) tape device.  By default _m_t performs the requested
     operation once.  Operations may be performed multiple times
     by specifying _c_o_u_n_t.

     The available commands are listed below.  Only as many char-
     acters as are required to uniquely identify a command need
     be specified.

     eof, weof
	  Write _c_o_u_n_t end-of-file marks at the current position
	  on the tape.

     fsf  Forward space _c_o_u_n_t files.

     fsr  Forward space _c_o_u_n_t records.

     bsf  Back space _c_o_u_n_t files.

     bsr  Back space _c_o_u_n_t records.

     rewind
	  Rewind the tape (_C_o_u_n_t is ignored).

     offline, rewoffl
	  Rewind the tape and place the tape unit off-line (_C_o_u_n_t
	  is ignored).

     status
	  Print status information about the tape unit.

     cacheon
	  Enable the readahead/writebehind cache on the tape
	  unit.

     cacheoff
	  Turn off the readahead/writebehind cache on the tape
	  unit.

     _M_t returns a 0 exit status when the operation(s) were suc-
     cessful, 1 if the command was unrecognized, and 2 if an
     operation failed.



Printed 11/26/99	December 22, 1995			1






MT(1)		    UNIX Programmer's Manual		    MT(1)



     The cacheon and cacheoff commands currently only apply to
     the TMSCP driver and then only for certain drives such as
     the TU81+.  No error is produced by the TMSCP driver if the
     cache commands are used.  Other drivers will return an error
     code since they do not recognize the MTCACHE and MTNOCACHE
     functions codes.  See mtio(4).

FILES
     /dev/rmt* Raw magnetic tape interface

SEE ALSO
     mtio(4), tmscp(4), dd(1), ioctl(2), environ(7)











































Printed 11/26/99	December 22, 1995			2



