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A Red Hat training course is available for Red Hat Enterprise Linux Module Name

The module name provides PAM with the name of the pluggable module containing the specified module interface. In older versions of Red Hat Enterprise Linux, the full path to the module was provided in the PAM configuration file. However, since the advent of multilib systems, which store 64-bit PAM modules in the /lib64/security/ directory, the directory name is omitted because the application is linked to the appropriate version of libpam, which can locate the correct version of the module.