How can i get sequences from a big list of accession number from NCBI?

Using EntrezDirect. Sequences truncated for brevity. Use appropriate database.

$ more id.txt
NC_021708
NC_019498
NC_019944

$ cat id.txt | epost -db nuccore -format acc | efetch -format fasta 
>NC_021708.1 Cuban alphasatellite 1 complete sequence, isolate 1_1
ACCCCGCCTCGTGCCATCTCTCCGTGCCATTGACTGGTCAATGGCTGTGGGTTTTTAAGGGCGTGCCGTC
--
>NC_019944.1 Okra enation leaf curl alphasatellite, complete sequence
AAGCTTTGGCCCCTGCGCACTTTAACCTTTGGCCCCTATAAATATATTTGTGCTGAGGCCGGATCATAGT
--
>NC_019498.1 Dragonfly-associated alphasatellite isolate PR_NZ48_2009, complete sequence
ACCCGCTTCGTTCCGTTTCCTCCTTGTTCCGGTATTTAAGCCTCCGCTTCTTTCATTTCTGGCTTCCTTT