usr/lib/learn/editor/L10.1b

#print
You can of course combine the various sorts
of line addresses we have been using.
Suppose the last line is line 6; then $ is
line 6, and $-1 is line 5.  Thus $-1 is the
next to last line, and
  1,$-1p
prints all but the last line of a file.  Again,
I'll put you in the editor: print the last three lines
of the file.  End with the usual w, q, and ready.
#create Ref
 Gil Hodges
 Yogi Berra
 Roy McMillan
89
#create file
New York Mets Managers
 Casey Stengel
 Wes Westrum
 Gil Hodges
 Yogi Berra
 Roy McMillan
#copyout
#pipe
ed file
#user
#unpipe
#uncopyout
tail -4 .ocopy >X1
#cmp X1 Ref
#fail
I hope you realized the addresses had to be
  $-2,$p
to get the last three lines.
#cmp X1 Ref
#log
#next
11.1a 10
11.2a 5