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Hey,I have a file in following format
>1
ABC........
>2
XYZ.....
>3
ABC........
>4
MNO.......
>5
ABC.......
now I would like to find only those entries that doesn't start with ABC...

How to delete a particular character in a file and then removing the spaces created by that removal.I am working with a text file containing nucleotide sequences.
I have tried sed command but it...