126 lines
4.3 KiB
HTML
126 lines
4.3 KiB
HTML
<HTML>
|
|
<HEAD>
|
|
<TITLE>mt(1)</TITLE>
|
|
</HEAD>
|
|
<BODY>
|
|
<H1>mt(1)</H1>
|
|
<HR>
|
|
<PRE>
|
|
|
|
</PRE>
|
|
<H2>NAME</H2><PRE>
|
|
mt - magnetic tape control
|
|
|
|
|
|
</PRE>
|
|
<H2>SYNOPSIS</H2><PRE>
|
|
<STRONG>mt</STRONG> [<STRONG>-f</STRONG> <EM>device</EM>] [<EM>count</EM>]
|
|
|
|
|
|
</PRE>
|
|
<H2>DESCRIPTION</H2><PRE>
|
|
<STRONG>Mt</STRONG> is a user interface to the magnetic tape commands described in
|
|
<STRONG><A HREF="../man4/mtio.4.html">mtio(4)</A></STRONG>. It allows one to space a tape forwards or backwards, write end
|
|
of file markers, etc.
|
|
|
|
With the <STRONG>-f</STRONG> option a tape device can be named, otherwise the environment
|
|
variable <STRONG>TAPE</STRONG> is used if set, otherwise the default device <STRONG>/dev/nrst4</STRONG> is
|
|
assumed. Standard input is used if the tape name is a dash (-). The
|
|
<EM>count</EM> argument is used to tell how many blocks or files to space or how
|
|
many file markers to write. It may be a C-style decimal, octal or
|
|
hexadecimal constant, by default "1".
|
|
|
|
<EM>Command</EM> is the action to perform, it may be one of the following, or any
|
|
unambiguous prefix (like <STRONG>st</STRONG> for <STRONG>status</STRONG>):
|
|
|
|
<STRONG>eof,</STRONG> <STRONG>weof</STRONG> Write <EM>count</EM> end-of-file markers.
|
|
|
|
<STRONG>fsf</STRONG> Forward space <EM>count</EM> file markers.
|
|
|
|
<STRONG>fsr</STRONG> Forward space <EM>count</EM> records. (The size of a record
|
|
depends on the tape, and may even be variable, depending
|
|
on the size of the writes.)
|
|
|
|
<STRONG>bsf</STRONG> Backwards space <EM>count</EM> files. The count may be zero to
|
|
backspace to the start of the current file. (A tape
|
|
device need not support backwards movement, or may be very
|
|
slow doing it. Rewinding and forward spacing may be
|
|
better.)
|
|
|
|
<STRONG>bsr</STRONG> Backwards space <EM>count</EM> records. The tape is positioned
|
|
after the last block of the previous file if you hit a
|
|
filemark when spacing backwards. The block count is set
|
|
to -1 to indicate that the driver has no idea where it is
|
|
on the previous file.
|
|
|
|
<STRONG>eom</STRONG> Forward space to the end of media.
|
|
|
|
<STRONG>rewind</STRONG> Rewind the tape.
|
|
|
|
<STRONG>offline,</STRONG> <STRONG>rewoffl</STRONG>
|
|
Rewind and take offline. This may cause some drives to
|
|
eject the tape.
|
|
|
|
|
|
<STRONG>status</STRONG> Shows the status of the drive, the sense key of the last
|
|
SCSI error, current file number, current record number,
|
|
residual count if the last command that encountered end-
|
|
of-file, and the current block size.
|
|
|
|
<STRONG>retension</STRONG> Removes tape tension by winding and rewinding the tape
|
|
completely.
|
|
|
|
<STRONG>erase</STRONG> Erases the tape completely and rewinds it.
|
|
|
|
<STRONG>density</STRONG> Sets the density code to read or write the tape to <EM>count</EM>.
|
|
Density codes supported depend on the drive. This command
|
|
need not be used if the drive senses the proper density on
|
|
read and can only write one density.
|
|
|
|
<STRONG>blksize,</STRONG> <STRONG>blocksize</STRONG>
|
|
Sets the block size used to read or write the tape to
|
|
<EM>count</EM>. This command may be used to select a fixed block
|
|
size for a variable block size tape. This will speed up
|
|
I/O for small block sizes. Use a zero <EM>count</EM> to use
|
|
variable sized blocks again.
|
|
|
|
|
|
</PRE>
|
|
<H2>ENVIRONMENT</H2><PRE>
|
|
|
|
<STRONG>TAPE</STRONG> Tape drive to use if set.
|
|
|
|
|
|
</PRE>
|
|
<H2>FILES</H2><PRE>
|
|
|
|
<STRONG>/dev/nrst4</STRONG> Default tape device.
|
|
|
|
|
|
</PRE>
|
|
<H2>SEE ALSO</H2><PRE>
|
|
<STRONG><A HREF="../man4/mtio.4.html">mtio(4)</A></STRONG>, <STRONG><A HREF="../man4/st.4.html">st(4)</A></STRONG>.
|
|
|
|
|
|
</PRE>
|
|
<H2>AUTHOR</H2><PRE>
|
|
Kees J. Bot (kjb@cs.vu.nl)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</PRE>
|
|
</BODY>
|
|
</HTML>
|