For data files that you entered in the database reference file, sequence number checking is on by default. If you do not need
               sequence number checking for a particular data file, you can disable the feature by using the /o s (omit sequence numbers) option for that data file's entry in the database reference file.
            
            
            Example
            
            Windows:
            fs /d dbase.ref /l \logdir\log.dat
fs /d dbase.ref /f test1.dat 
fs /d dbase.ref /f test2.dat /o l 
fs /d dbase.ref /f test3.dat /o s
            UNIX:
            fs -d dbase.ref -l /logdir/log.dat 
fs -d dbase.ref -f test1.dat 
fs -d dbase.ref -f test2.dat -o l 
fs -d dbase.ref -f test3.dat -o s
            This example specifies:
            
            
               
               - The database reference file is named dbase.ref
- The log file is named log.dat in the logdir directory 
               
- Updates to the data file test1.dat are logged in the log file. By default, sequence number checking is on for any data file in the database reference file,
                  and hence for this file 
               
- Updates to the data file test2.dat are not logged in the log file. The "/o l" option specifies that logging is omitted. However, sequence number checking is
                  still active for this file. 
               
- Updates to the data file test3.dat are logged in the log file. However, sequence number checking is not activated for this data file. The "/o s" option specifies
                  that sequence number checking is not used on this data file.