How to swap fasta entrys in a fasta file?

Question

[SaltedPork]

Hi, my files all have 2 fasta entries and they look like:

>ID.1
GTAACACGACATCCTGCAGGGTTAAAAAAGAAAAAATCAGTAAAAGTACTGGA
>ID.2
GGAATACCACATCCCGCAGGGTTAAAAAAGAAAAAATCAGTAACAGTACTGGA

My desired output looks like:

>ID.2
GGAATACCACATCCCGCAGGGTTAAAAAAGAAAAAATCAGTAACAGTACTGGA
>ID.1
GTAACACGACATCCTGCAGGGTTAAAAAAGAAAAAATCAGTAAAAGTACTGGA

I have looked into awk/sed and the only solutions involve cutting/pasting rows into a sperate file and then moving them back, is there an alternative way?

Answer 1

[rpolicastro]

Seqkit answer for posterity.

seqkit sort -r in.fasta > out.fasta

Answer 2

[SaltedPork]

awk -F'\n' '{print $3, $4, $1, $2}' OFS='\n' RS= ORS='\n\n' $i