Use when you need to post unique identifiers or accession numbers to NCBI Entrez databases for subsequent retrieval operations
epost/home/vimalinx/miniforge3/envs/bio/bin/epostefetch or esummary for the actual human-usable output.# 1) Post a protein accession from stdin and fetch FASTA
echo 3OQZ_a | epost -db protein | efetch -format fasta
# 2) Post an assembly accession directly
epost -db assembly -id GCF_000001405.38 | efetch -format docsum
# 3) Post IDs from a file
epost -db bioproject -input bioproject_ids.txt | efetch -format docsum
-format if needed.epost as the staging step, then immediately chain to retrieval or summarization.-db.-format semantics.epost output is mainly machine-oriented; it is not the end-user deliverable.-input for long lists rather than stuffing thousands of IDs into -id.