name resolution in Linux

Name resolution in Linux is a pipeline of verification jobs, not a single file: a process consults the Name Service Switch, which has a configuration file at /etc/nsswitchconf. This file contains a list of entries. Each entry describes a database and the list of sources to refer to in the order of their appearance in the entry.

An entry is written in this format: DatabaseName NameService1 [Status=Action] NameService2