#print
You can print an entire file making use
of the fact that "$" refers to the last line.
The command
  1,$p
prints from the first line to the last one,
or the whole file.  Try printing this
whole file with this command, and
then typing w, q and ready.  Your commands
should look like
  1,$p
  w
  q
  ready
#create Ref
1,$p
w
q
#create file
New York Mets Managers
 Casey Stengel
 Wes Westrum
 Gil Hodges
 Yogi Berra
 Roy McMillan
#copyin
#pipe
ed file
#user
#unpipe
#uncopyin
tail -3 .copy >X1
#cmp X1 Ref
#log
#next
10.2b 10