Library /sys$common/syshlp/teco.hlb Commands, EX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The "EX" command is used to write the current buffer to
  the output file, copy the remainder of the input file to
  the output file, and exit from TECO.  For example,

      EX$$

  (Note that the <ESC> key echoes as "$" at your terminal,
   and that you must type the <ESC> key twice to cause the
   command to be executed.)