DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   line editor
      <tool, text> An early kind of text editor suited to use on a
      teletype.  The user enters editing commands which apply to
      the current line or some given range of lines.  These include
      moving forward and backward through the buffer, inserting and
      deleting lines, substituting a string for a pattern match, and
      printing lines.  Visual feedback is restricted to explicitly
      requesting the display of one or more lines, in contrast to a
      screen editor.
      ed is Unix's line editor.
      (1999-03-01)