ENDFILE

 For sequential files, writes an end-of-file record to the file and
 positions the file after this record (the terminal point).  For
 direct access files, truncates the file after the current record.

 Statement format:

    ENDFILE ([UNIT=]io-unit[,ERR=label][,IOSTAT=i-var])
    ENDFILE io-unit

    io-unit   Is the logical unit specifier, optionally prefaced 
              by UNIT=.  UNIT= is required if unit is not the first 
              I/O specifier.

    label     Is the label of an executable statement that 
              receives control if an error occurs, prefaced 
              by ERR=.

    i-var     Is an I/O status specifier, prefaced by IOSTAT=.
              (Returns a zero if no error condition exists or 
              a positive integer if an error condition exists.)

 If the unit specified in the ENDFILE statement is not open, the
 default file is opened for unformatted output.

 An end-of-file record can be written only to sequential
 organization files that are accessed as formatted sequential files
 or unformatted segmented sequential files.  An ENDFILE statement
 performed on a direct access file always truncates the file.

 An ENDFILE statement must not be specified for a file that is open
 for keyed access.  End-of-file records should not be written in
 files that are read by programs written in a language other than
 Fortran.