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0 I have text lines like these below: P, 123456 ,01,A,H, 123456 ,123456 123456 ,, P,123456 ,01,A,H, 123456, 123456 123456,, P, 123456,01,A,H,123456 ,123456 123456 ,, P, 123456,01,A,H, 123456, 123456 123456,, P,123456 ,01,A,H,123456 ,123456 123456 ,, I want them to be like below: P,123456,01,A,H,123456,123456 123456,, P,123456,01,A,H,123456,123456 123456,, P,123456,01,A,H,123456,123456 123456,, P,123456,01,A,H,123456,123456 123456,, P,123456,01,A,H,123456,123456 123456,, Requirements: Remove all leading & trailing spaces from 2,6,7 column only Values in 7th Column should remain separated by single space only Research: I have tried many combinations with awk , sed , tr but could not succeed according to my requirements. I would like to have a preferable solution in awk , s