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The command that you are looking for is a command called lsusb. It is a utility for displaying information about USB buses in the system and the devices connected to them under Linux kernel.
The directory that you are looking for is the init.d directory. It g contains a number of start/stop scripts for various services on your system. Everything from acpid to x11-common is controlled from this directory.
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I have linux mint cinnamon. My T520 Lenovo thinkpad