32v 1m dumpdir
DUMPDIR(1M) UNIX Programmer's Manual DUMPDIR(1M)
dumpdir - print the names of files on a dump tape
dumpdir [f filename]
Dumpdir is used to read magtapes dumped with the dump command and list the names and inode numbers of all the files and directories on the tape.
The f option causes filename as the name of the tape instead of the default.
default tape unit varies with installation rst*
If the dump extends over more than one tape, it may ask you to change tapes. Reply with a new-line when the next tape has been mounted.
There is redundant information on the tape that could be used in case of tape reading problems. Unfortunately, dump-dir doesn't use it.