esearch

Perform a new Entrez search using terms in indexed fields. It is part of the edirect package. More information: https://www.ncbi.nlm.nih.gov/books/NBK179288/.

esearch -db pubmed -query "selective serotonin reuptake inhibitor"

esearch -db protein -query 'Escherichia*'

esearch -db nuccore -query "insulin [PROT] AND rodents [ORGN]"

esearch -h