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The RTC subsystem went through a major redesign since at least 2006 and since then doesn't have a statically assigned major number, now. This is a rather major trend in the Linux kernel for various device drivers (device-mapper for example also dynamically allocates its device-number region). The reason behind this is that the vast amount of available ...


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If I understand you right then there is some file system on /dev/sdb that you have mounted. What matters here are the permissions in the file system that resides on /dev/sdb, the permissions of /dev/sdb are completely irrelevant for your question. Except that with permissions 0666 anyone can bypass the access control mechanisms for that file system and ...


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A Solution: The problem is that this serial port is non-PlugNPlay, and a system do not know which device was plugged in. Anyway, after reading a HowTo I get the working idea. An *nix-OS already have in /dev/ a files like ttySn where a n ending is a number. Most of this files is dumb i.e. doesn't correspond to an existing devices. But some of those is going ...


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/dev/sdb is the block device name. Changing the permission of /dev/sdb will not affect the filesystem on /dev/sdb. Use mount to get the list of mounted mediums and mountpoints. Use chmod to change permissions in mountpoint. e.g. mount will show lines which looks something like /dev/sdb1 on /run/mount/pioneeraxon/disk1 type ext4 (...) In such case ...


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Solution 1: Run dmesg and watch out for ttyUSB* lines if your modem interface is a classical emulated serial interface. Solution 2: Browse /sys/bus/usb/devices/X-1:Y:*/ until you find useful information. Based on your line Bus 003 Device 013: ID 0421:0007 Nokia Mobile Phones, i would guess X=3 and Y= 12 (13 minus one). Solution 3: Run udevadm monitor as ...


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The devices in /dev/bus/usb/XXX/YYY follow naming policies in the kernel as noted Gilles in the comments. XXX is the bus number which is quite stable, but YYY changes every time the USB device gets enumerated (when a device just got inserted or reset). This cannot be changed and you shouldn't have to change this either. If you need to change permissions on ...



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