Linearise your sequences like so (or use any one of a number of solutions on the forum):

cat fasta.fa | while read line ; do if [ "${line:0:1}" == ">" ]; then echo -e "\n"$line ; else  echo $line | tr -d '\n' ; fi ; done | tail -n+2 > linear.fasta

Then just use grep -A 1 '>lncRNA' linear.fasta

You can always try with bedtools getfasta -fi <fasta_reference> -fo <fasta_output> -bed <your_interval_file>

1 observation! Be careful if you are using macOS with the carriage return (see info here if needed), as your fasta will contain only the first lane of your bed annotation.

Cheers, and I hope it's useful

Thank you. I directed grep 'lncRNA' output to headers.txt and used faSomeRecords.py. Bedtools would have been easier too, but I was not sure which option to use in 'Create one BED record per:' in table browser. FaSomeRecords.py worked good.