einfo

Provides the number of records indexed in each field of a given database, the date of the last update of the database, and the available links from the database to other Entrez databases. More information: https://www.ncbi.nlm.nih.gov/books/NBK179288/.

Print all database names:

einfo -dbs

Print all information of the protein database in XML format:

einfo -db {{protein}}

Print all fields of the nuccore database:

einfo -db {{nuccore}} -fields

Print all links of the protein database:

einfo -db {{protein}} -links