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Thanks for the replies...I got over it by declaring a counter. Since I have to do it for a big file, the way with the counter is working pretty well...thanks for the replies..

sorry...i don't get this....

what I think this will do is that if(either of the expressions are present), then set to Y; else set to N.

What I need is if (all expressions are present), then set...

Hi..

isn't this an OR condition? What I need is that if all the expressions, AB, BC, CD and DE should be present in the file, then it should set flag as 'Y'

I have a txt file like below:

testin.txt

AB
BC
CD
DE

I have the following awk script

BEGIN {flag1="N"}
/(AB)|(BC)|(CD)|(DE)/ {flag1="Y"}
END {print flag1}

>awk -f testin.awk...