Interdata_v6/usr/doc/man/man1/tm.1

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including files from this version of Unix. 
.th TM I
.sh NAME
tm - map of records and filemarks on magtape
.sh SYNOPSIS
tm [-N] [-tN] [-rN] [-e]
.sh DESCRIPTION
Read the tape on drive /dev/mtN (default mt0)
and print a summary of record lengths and tapemarks.
Output lines have the form
.br
.dt
	L:N
.br
(N records of length L), or
.br
	tm:N
.br
(N tapemarks).

.lp +6 4
-tN	stop after N consecutive tapemarks (default: 2)
.s3
.lp +6 4
-rN	stop after N records
.s3
.lp +6 4
-e	continue even if I/O errors occur
.i0
.sh AUTHOR
R Miller
.br
University of Wollongong