sed 's/17-MAY-18/SYSDATE/g' <test.sql >new-test.sql
Isso criaria new-test.sql
com o conteúdo
INSERT INTO ADJUSTMENT_REASON VALUES (SYSDATE,,'','','','S','C','Y','N',,'Y','N','N','A','BAN','Y','B','Mobile Internet Discount','N','','','N','B','','','N','N','');
INSERT INTO ACTIVITY_REASON_TEXT VALUES ('ADJ','','','',SYSDATE,'','','','Mobile Internet Discount','Mobile Internet Discount','Y','N','','A',,'',,'','','');