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This documentation reflects EDirect version 10.9, released on 2/1/2019.

We strive to keep this documentation up-to-date with the latest release. If you are looking for documentation on a more recent version of EDirect, or to find out more about new EDirect releases, please see the Release Notes of NCBI's EDirect documentation.

The efilter command uses the History server to filter or restrict the results of a previous query.

This page is still under construction. For more information on efilter, please see NCBI’s EDirect documentation page, “Entrez Direct: E-utilities on the UNIX Command Line”.