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In Linux, command typed at a command prompt displays a list of commands that would likely contain the command you desire. For example, to find all of the commands that have word flush in their name or descriptions type the following: man -k flush
potential results.
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For anyone looking for a list of all Shakira songs ever produced, they could search her on Google or Wiki her name and discography. Her personal wiki also displays them.
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This isn't really a module. In Linux a module is something you load into the kernel or into an application to extend their capabilities. The X client that displays a user list for login purposes is called a "display manager."