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Hi I am looking at a script which checks for valid interfaces. The command ls /dev/ttyUSB* is great for USBs, as if one is not plugged in nothing comes up. However ls /dev/ttyS0 comes up with at least four even on my lappy which does not have a serial port. Does any one know a way around this? All the best Peter L-J -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html