From LQWiki
modprobe is a command used to add or remove modules from the kernel.
To display all available modules use:
/sbin/modprobe -l
To list all loaded modules, use:
lsmod
To show the filename of a module, use e.g.:
$ modinfo -n snd_ac97_codec /lib/modules/2.6.18.8-0.1-default/kernel/sound/pci/ac97/snd-ac97-codec.ko

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