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DEL doesn't indicate that that process deleted /dev/zero, but that that process is using /dev/zero and the instance of /dev/zero that was being used has since been deleted. For example, if I have a command (say some-command) that uses /some/file and I do: $ some-command & $ rm /some/file $ touch /some/file Then lsof for /some/file would look like: ...


/dev/hda1 : No this is a partition /dev/bin/ : No this doesn't exist /dev/sda2 : No , this again is a partition /dev/hdx is used to represenet IDE devices So the correct answer is.... /dev/sda


I think there are cleaner solutions to your problem: add your user to a dialout group or use udev to automatically chmod fresh device. They are discussed here: http://askubuntu.com/questions/112568/how-do-i-allow-a-non-default-user-to-use-serial-device-ttyusb0

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