4.3BSD-UWisc/lib/learn/editor/L15.1a

#print
So far you only know how to copy and print existing files in the editor,
and not how to get started from scratch.  The 'a' (append) command lets
you type in new text.  For example, the sequence
  ex file
  a
  this is a new line of text
  .
  wq
will append the line
  this is a new line of text
to the editor buffer, and then write it on "file".  (If "file" doesn't
already exist, the editor will warn you, but it's not an error.)

Note that the material being added ends with the line that just contains
a single '.' and that normal editor commands then resume.  Following this
pattern, make a file named "pres" that contains the line

franklin delano roosevelt

and, after you have written it with a 'w' command, and done your 'q',
try saying "cat pres" to check that you did it right.  Then type "ready".
#create Ref
franklin delano roosevelt
#user
#cmp pres Ref
#log
#next
15.1b 10