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As the name suggests, PAM consists of many modules. You can see whichmodules were installed with your system by issuing this command: $ ls /usr/lib |grep pam_ Note that each module ends in so and has a name that givessome indication of what that module is responsible for. “Pluggable” means you have great flexibility. The entire framework alreadyexists; you merely choose which portions of the framework you wish toimplement. It also implies that one can “plug in” the desired module.  
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