The EXIT (abbreviated EX) command terminates all action in the editor
 and saves a copy of the MAIN text buffer in the output file.

 Format: EXIT [file-spec] [/SEQUENCE:[init:incr]] [/SAVE]

 If you omit the file specification, the output file name from the
 command line that invoked EDT is used.  If no output file name has been
 specified, and if /READ_ONLY and /NOOUTPUT have not been specified, then
 the input file name is used.