grep -l 'RITE AID.*ST.820' natriter820u.20140914
Pattern1 - RITE AID
Pattern2 - ST*820

ISA*00*          *00*          *ZZ*NATIONSBANK    *14*0030020520500  *140918*1200*U*00401*000006436*0*P*^
GS*RA*014578892*IGIHCJEEJ*20140918*1200*6442*X*004010
ST*820*000006482
N1*PR*RITE AID HDQTRS. CORP.*1*014578892