Updated text. Thanks

A few typos need to be fixed. The current ordering looks a bit random - maybe they would be better in alphabetical order? Although I could be persuaded that fastq_barcode is better listed after fastq_casava given the relationship between them.

The order was deliberate, in the order they are applied basically.

FASTQ headers have name first, so fastq_name2, then comes the CASAVA string if present, then aux tags. I put fastq_barcode before fastq_aux as it refers to both CASAVA and general aux tags so it fits neatly between the two. Basically I wrote them so if you read them naturally one after the other then they form a sensible ordering which relates to the file format. If you're just trying to look up a specific one, then I suggest searching as frankly you'd need that anyway given the size of the man page.

Edit: I forgot thelast one, fastq_rnum. That's output only. You'll see there is the input only, then input/output and finally output only in that order. To my mind at least that makes sense, but I could see an argument for putting rnum next to name2. It's all arbitrary, but alphabetical is even more arbitrary given there is no real group other than whatever word happened to be used. The only benefit to alphabetical is searching / random access on long lists, but this list is tiny. I'll also refer you to the main man page structure which is by theme, and not alphabetical.