Shell script to check if something is plugged in the wifi USB port

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http://askubuntu.com – I have a wifi access point that allows to plug a USB hard drive accessible from any computer sharing the same wifi. I would like to know if there was a way a shell script could test if something is plugged there or not. If there is a way to check which USB key or hard drive is plugged would be a delight, but I'm not asking that much. edit The goal is to check if the drive is on before I can work with the files. I want to access the drive using samba. The IP is I can get the name of the drive, but the IP is fix, whichever drive I plug. NOTE: my final goal is to upload files o (HowTos)