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/.

• Search the pubmed database for selective serotonin reuptake inhibitor:
  esearch -db pubmed -query "{{selective serotonin reuptake inhibitor}}"
• Search the protein database using a query and regexp:
  esearch -db {{protein}} -query {{'Escherichia*'}}
• Search the nucleotide database for sequences whose metadata contain insulin and rodents:
  esearch -db nuccore -query "{{insulin [PROT] AND rodents [ORGN]}}"
• Display [h]elp:
  esearch -h