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I need to write a one liner that extracts headers from a fasta file, sorts them into alphabetical order and erases duplicates.

I need to extract a header from a fasta file. I know how to delete the headers but i don't know how to delete everything EXCEPT the headers in order to have only the headers remaining. I need to write a perl one liner for this.

I need to write a one liner that extracts headers from a fasta file, sorts them into alphabetical order and erases duplicates.

I need to extract a header from a fasta file. I know how to delete the headers but i don't know how to delete everything EXCEPT the headers in order to have only the headers remaining. I need to write a perl one liner for this.

We streaked strains containing different mutations of the lac operon on minimal medium. This was sprayed with MUG. I want to know what does it mean when the plates fluoresce under UV light?