What command displays all localization environment variables and their values in Linux?

The command that displays all localization environment variables and their values in Linux is "locale." When you run this command, it presents a list of currently set locale-related environment variables, such as language settings, character encoding, and other locale-related settings. This command is essential for understanding how the system is configured for language and regional settings, which can affect how text is displayed and interpreted, particularly in internationalized applications.

While "localectl" is another command related to localization, it is mainly used to manage system locale and keyboard layout settings rather than to simply display them. The command "setlocale" is more focused on setting or obtaining the current locale but does not display all localization variables like "locale" does. Lastly, "env" is used to display environment variables but does not focus specifically on localization variables, thus providing a more general view of the environment. Hence, "locale" is the most fitting choice for showing all localization environment variables and their values specifically.