%SCAN for checking a value in a field by using an Indicator at EQ , where it is existed or not .
It gives first place where it found .
%SUBST to extract a portion from a field .
%EOF to check , whether the file reached to the bottom or not .
%CHECK to check a value in a field . but it is exactly opposite to % SCAN , because it gives first not existed position .
%FOUND to findout the record is existed or not while used READ or CHAIN, ……