how to make reverse complement of sequence in shell

file content format(tab seperate)

seq_1     atgagagataac
seq_2     tagcgattcaca

output file format(fasta type)
>seq_1
atgagagataac
>seq_1_recom
gttatctctcat
>seq_2
tagcgattcaca
>seq_2_recom
tgtgaatcgcta

$ cat "sequence file" | while read id seq; do echo -e ">$id\n$seq"; recom_seq=$(echo $seq | rev | tr "atgc" "tacg"); recom_id="$id"_revom; echo -e ">$recom_id\n$recom_seq"; done > outout.fasta

ex)
$ awk 'NR<=1300' "sequence file" |grep -v gggg |cut -f2,8 | while read id seq; do echo -e ">$id\n$seq"; recom_seq=$(echo $seq | rev | tr "atgc" "tacg"); recom_id="$id"_revom; echo -e ">$recom_id\n$recom_seq"; done > output.fasta