Hi. I tried out what you sed above. It worked. thanks.. Now what i need to do further is count the occurrences of each of these lines. As you can see in <DATA>, the string "c_2_1_2- + a_123_1_1-" has occurred 2 times and the reverse of it "a_123_1_1- + c_2_1_2-" has occurred once. Now i need to get a cumulative count for this pair (irrespective of the order in which it occurs i.e. as "a_123_1_1- + c_2_1_2-" or as "c_2_1_2- + a_123_1_1-", so that the total count of this entry is =3 as in <DATA>) The actual file which i am working on is similar but is larger in size, and has around 8000 lines. What is the solution to this problem? awk hasn't helped me so far.

In reply to Re^2: xtracting unique lines by anasuya
in thread xtracting unique lines by anasuya

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