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