tldr/pages/linux/esearch.md

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# 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`