#print
Printing only one line at a time gets pretty
slow.  You can print several lines with
commands like
  1,3p
which prints lines 1, 2 and 3.
Again, I'll put you into the editor
with the familiar file.  Print lines
2 through 5 of it; then type w, q and ready.
#create Ref
:john adams
thomas jefferson
james madison
james monroe
:"file" 6 lines, 91 characters
#create file
george washington
john adams
thomas jefferson
james madison
james monroe
john quincy adams
#copyout
#pipe
ex +'set prompt noopt open' file
#user
#unpipe
#uncopyout
tail -5 .ocopy >X1
#cmp X1 Ref 5
#log
#next
10.1a 10
9.2e 5