Update cheatsheets

linux/elink

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# elink
+
+> Look up precomputed neighbors within a database, or find associated records in other databases.
+> It is part of the `edirect` package.
+> More information: <https://www.ncbi.nlm.nih.gov/books/NBK179288/>.
+
+- Search pubmed then find related sequences:
+
+`esearch -db pubmed -query "{{selective serotonin reuptake inhibitor}}" | elink -target nuccore`
+
+- Search nucleotide then find related biosamples:
+
+`esearch -db nuccore -query "{{insulin [PROT] AND rodents [ORGN]}}" | elink -target biosample`