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Shell script make FASTA format to single line including ID and sequence

A FASTA format usually looks like below.

>seq1
ATGC
>seq2
GCTA
>seq3
GTAC
......
....
..

How to make it showing as single line using shell script? The ID and sequence are separated by Tab.

>seq1    ATGC
>seq2    GCTA
>seq3    GTAC
.......
....
..

I found most likely answer but not working for me.

awk 'NR%4{printf $0" ";next;}1' input.fasta

Anyone can help please?

bash shell fasta

Hello SheelS!

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