The man page that should be

  ED(1) UNIX Programmer's Manual ED(1)

  NAME
  ed - text editor

  SYNOPSIS
  ed [ - ] [ -x ] [ name ]
  DESCRIPTION
  Ed is the standard text editor.
  -----

  Ed is the standard text editor.

  Ed doesn't waste space on my Timex Sinclair. Just look:

  -rwxr-xr-x 1 root 24 Oct 29 1929 /bin/ed
  -rwxr-xr-t 4 root 1310720 Jan 1 1970 /usr/ucb/vi
  -rwxr-xr-x 1 root 5.89824e37 Oct 22 1990 /usr/bin/emacs

  On powerful systems, vi is often symlinked to ed.
  Emacs is replaced by a shell script which:
	1) Generates a syslog message at level LOG_EMERG;
	2) Reduces the user's disk quota by 100K;
	3) Runs ed.


  [ Sample User Session With Ed ]

  golem> ed
  This is a test.
  ?
  help
  ?
  ?
  ?
  quit
  ?
  exit
  ?
  bye
  ?
  hello?
  ?
  sweet jesus let me out of this hellish prison!
  ?
  ^C
  ?
  ^C
  ?
  ^D
  ?

  ---
  Note the consistent user interface and error reportage. Ed is
  generous enough to flag errors, yet prudent enough not to overwhelm
  the novice with verbosity.

  Ed is for those who can *remember* what they are working on. If you
  are an idiot, you should use Emacs.