I can’t imagine that this would be useful in a well managed system, but if you find yourself with a “raw” log file that is not in the dictionary, you can at least extract the SCN range it encompasses using what is below.
[oracle@dell11gr1 ~]$ awk --version
GNU Awk 3.1.5
Copyright (C) 1989, 1991-2005 Free Software Foundation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
[oracle@dell11gr1 ~]$ strings -a arch1.arc | head -20 | grep SCN | awk -F "," '{split($3,t," ");split(t[2],t2,"-");printf("Start SCN = %d, End SCN = %d\n",strtonum(t2[1]),strtonum(t2[2]))}'
Start SCN = 5345720, End SCN = 5350856
[oracle@dell11gr1 ~]$