This may be a couple questions in one, but this problem has me stuck. I have a text file with groupings of four lines separated by an empty line. The first line of every grouping begins with a '>' symbol. I want to delete all instances of groupings with identical first lines, except for the first instance of the grouping. First thing that comes to mind is using sed but cant think of a good way to implement. Would be grateful for any help!
input:
>abc1234.54321
linea1
lineaa1
lineaaa1
>def56789034
linea1
lineaa1
lineaaa1
>abc1234.54321
linea2
lineaa2
lineaaa2
>def56789034
linea2
lineaa2
lineaaa2
intended output:
>abc1234.54321
linea1
lineaa1
lineaaa1
>def56789034
linea1
lineaa1
lineaaa1