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The EOF command writes an end-of-file mark on the specified magnetic
tape. Use this command for unlabeled tapes only.
@EOF (DEVICE) dev:
dev: is the name of the magnetic tape drive on which you
want to write an end-of-file mark. The colon after the
device name is optional.
EOF Seldom Needed
Because tape-writing programs and commands automatically
write end-of-file marks in the appropriate places, you do
not ordinarily need the EOF command. But it can be useful
if such a program is interrupted (by your CTRL/C or by a
system failure and restart) and you want to preserve the
information already written. Also, you can shorten files on
an existing tape by giving an EOF command at the desired
EOF With Open Files
If you have given a CTRL/C to exit from a program that has
opened a magnetic tape drive and you then give the EOF
command for that tape drive, the system will first allow you
to close the associated file. You must do so for the EOF
command to succeed, but you will probably be unable to
continue the program from that point, because the file will
now be closed.
| other TOPS-20 commands for controlling magnetic
| tape drives
1. Put an end-of-file mark (EOF) on your magnetic tape.