IBM Professional Series User Manual page 107

Can you press the ERASE EOF key to clear a line? Yes, but
there are two things you should be aware of. First, you must
move the cursor to column one in the line and press the
spacebar once before pressing the ERASE EOF key. If you
don't press the spacebar, the data will come back in the line
the next time you press the ENTER key. This prevents you
from erasing a line if you press the ERASE EOF key
accidentally. Second, the data will be removed from the line,
but the blank line will remain in the file. So it's better to use
a d prefix command if you want to delete a line.
If
you want
to delete only some of the characters in a line, instead of a
whole line, you can use the delete key.
Deleting a Block of Lines: To delete a block of lines, type the
letters "dd" in the first line of the block. Then type "dd" in
the last line of the block. Then press the ENTER key. For
example:
dd=== This is the first line I want to delete.
===== This is the second.
===== This is the third.
===== This is the fourth.
dd=== This is the last.
When you press the ENTER key, all of the lines are deleted.
A block of lines doesn't have to be all on one screen. You
can type "dd" on the first line of the block and then scroll
the display until you find the last line of the block. Then you
can type the second "dd" and press the ENTER key. Use
PF8 to scroll forward, PF7 to scroll backward.
If
you type "dd" in a line and then press PF7 or PF8, the
status area displays:
BLOCK INCOMPLETE
This reminds you that the editor is waiting for you to enter
the second "dd," thus completing the block.
Cancelling A Deletion - RECOVER Command: Suppose you
use a d prefix command to delete one or more lines, and then
you change your mind. You want the lines back. You can
get them back by using the RECOVER command.
It
is
entered in the large arrow command line and has the format:
5-16 VM/PC Users Guide