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3
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1answer
72 views

Is 'device' synonymous with 'drive' in Unix-like OS's?

In Unix/Linux terminology, are the words 'device' and 'drive' synonymous?
2
votes
1answer
258 views

Why slowusb and scandelay?

I'm running linux-3.4.9 compiled with genkernel, and booting from a USB HDD. I was slightly annoyed by the slow boot process, in particular, during the execution of genkernel scripts at the modprobe ...
2
votes
2answers
698 views

Chroot Risks w/ /dev and /proc

I am planning to set up a few chroot jails for some users to run/test Java applications (lets just assume each application is untrusted). Is there any risk involved with mounting /dev and /proc into ...
14
votes
2answers
2k views

bash script to detect and record mouse movements?

I need to be able to record the mouse movements every so often (every .2 of a second for example) and have them in a coordinate representation instead of a diff. I found the following script: ...
3
votes
3answers
8k views

GSM modem does not create /dev/ttyUSB file

I installed Kannel in a server, and I want to use a GSM 3G USB modem to send/receive SMS messages, as described in section SMS Centers > GSM Modem of the Kannel User Guide. I have already installed, ...
9
votes
1answer
689 views

What happens when I do “cat debian.iso > /dev/sdX”?

I'm creating a live-USB and don't understand precisely: what happens when I copy a file (or even a file system) directly to a device node (as opposed to a file system)?
0
votes
1answer
148 views

Using USB hub for keyboard and mouse in multiseat

I want to configure a 2 user multi-seat in Linux. Is it possible to configure keyboard and mouse for second seat with a USB hub on a single USB port or I need to connect each of them to a separate USB ...
5
votes
1answer
145 views

Does the suid bit have any meaning for device files?

Does the suid bit have any special meaning for device files in Linux ?
3
votes
0answers
257 views

How to know the event by looking at /dev/input/by-id

I want to access the keyboard device driver. I usually accesses it by looking at /dev/input/by-name but the event provided by it gets changed every time I log in. After searchin on the Net, I found ...
2
votes
1answer
904 views

Debian USB automount

Got my USB flash automount broken after reboot. Using Debian 6, GNOME 2 My NTFS hard disk is still mounting correctly. When i connect my Android smartphone (with SD and local drive) my messages log ...
7
votes
1answer
5k views

Understand output of `udevadm info -a -n /dev/sdb`

I plug an external HDD into my laptop. I try to find out the information by $ udevadm info -a -n /dev/sdb Udevadm info starts with the device specified by the devpath and then walks up the chain of ...
3
votes
1answer
454 views

FreeBSD: Remove symlinks in devfs

Background I have been rebuilding a small home NAS. This server represents my first 'real' foray into the world of server administration and it has taught me quite a bit already. Originally, the ...
9
votes
1answer
747 views

What driver is behind a certain device file?

Given a device file, say /dev/sdb, is it possible to determine what driver is behind it? Specifically, I want to determine what driver my storage devices are using. fdisk -l lists 2 devices: /dev/sda ...
1
vote
1answer
334 views

Do I need ephemeral storage?

I was running a small instance on Amazon EC2. I'm trying to migrate it to a micro as it requires very minimal processing power. One thing I just learned though, is that micro instances do not come ...
2
votes
0answers
58 views

Limiting write rate of a device

How does one go about limiting the write/read rate of a device, E.G., USB drive, SD card? Motivation behind this question is covered here (superuser.com).
1
vote
0answers
99 views

“nopage” method for ISA vs PCI [closed]

This is with reference to LDD3 ch. 15, section "Mapping memory with nopage". I am having trouble understanding the third paragraph on page 429. It says: Note that this implementation works for ISA ...
2
votes
0answers
62 views

What are the differences between the current Linux kernel and the Unix SVR4 kernel in terms of device drivers+i/o and virtual files systems?

Yes I realize that Linux supports many more file systems and recognizes more devices than Unix SVR4. I'm interested in what the differences are in the abstraction on top of an actual file system, or ...
5
votes
1answer
372 views

Does the kernel delete entries in /dev on an initramfs?

I have a fully custom, minimal, embedded Linux (vanilla, 3.3.8, i486, Vortex86dx) system that boots from an initramfs image. No standard distribution scripts are used, just a single rcS file that does ...
1
vote
1answer
573 views

Can I use a parallel port as a CUPS input device?

I have an old piece of a hardware that does diagnostics on medical equipment. It prints out results over a parallel port. Is there any way to have CUPS accept jobs from a parallel port and redirect ...
0
votes
1answer
245 views

Hidden ext4 partition?

Is there a way to hide an ext4 partition from e.g Thunar? And the open file/save dialog , I think they come from the same source.
3
votes
1answer
3k views

How can I uniquely identify which device is on USB `hub 6-0:1.0: port 2`?

How can I uniquely identify which device is on USB hub 6-0:1.0: port 2? I receive messages in my dmesg every now and then and I want the system to tell me which device is connected to that port. ...
10
votes
2answers
5k views

set baud speed for tty

How do I set the baud speed for a specific tty (in this case a serial port)? I tried using stty -F /dev/tty.iap ispeed 19200 But get the error Invalid argument for every speed I try (2400, 4800, ...
3
votes
0answers
578 views

Build an Affordable Linux Tablet [closed]

I have 3 young children and my wife has asked that the girls get a tablet, for basic gaming, and online web tutorials (school work usually). Has anyone created or built a good affordable Linux ...
3
votes
5answers
3k views

GNU/Linux (Debian): detecting hard-disks mappings?

Let's suppose you have two hard-disks: one internal (boots GNU/Linux); one external (USB). "fdisk -l" detects both, but will not tell you which is /dev/sda and which is /dev/sdb. "lsusb" will tell ...
0
votes
0answers
136 views

problem exporting /media as an nfs share: why does it happen?

I've got two netbooks. One netbook has two installed Linux systems: openSUSE 11.04 and Debian testing. By default, in Debian, gnome mounts the /home filesystem for openSUSE, which shows up in gnome's ...
14
votes
3answers
2k views

Monitor what is being sent to /dev/null?

Just for fun: Is there a way to monitor/capture/dump whatever is being written to /dev/null? On Debian, or FreeBSD, if it matters, any other OS specific solutions are also welcome.
2
votes
1answer
199 views

Is there any way to control the light value of the Apple logo on a MacBook?

I'd like to mess around a bit with controlling the Apple logo on the outside of my MacBook Pro from Ubuntu. (I'd like to hook it up to my music and have it light up and down with the decibels :]) ...
1
vote
1answer
2k views

What's the difference between 'no caching page mode present' and 'assuming drive cache. write through.'

Post-POST, post-BIOS screen, post-GRUB; when I boot Debian with a SD card or USB stick plugged in, one of the first things to pop up on the screen (so quickly that usually I don't even notice) looks a ...
2
votes
1answer
391 views

udev weirdness: /dev/hda1 mounted but file not present

I think my question is related to udev and/or udisks, but I am really not sure at all what's going on here. To start with, my system works more or less fine. The less part is due to the fact that, ...
3
votes
2answers
443 views

Choosing a device name under /dev from the kernel command line

I am booting CentOS via a USB install. The boot method is simply booting the ISO from GRUB2 installed on the USB Key. The USB key always gets the "name" /dev/sda. Can I change that name from the ...
23
votes
2answers
5k views

How to create /dev/null?

I successfully deleted my /dev/null. How can I restore it? The OS is Ubuntu.
0
votes
0answers
460 views

Silicon Wave USB Bluetooth Adapter doesn't work

I have been trying to use my usb bluetooth adapter(silicon wave) on ubuntu 11.10 server, it appears in the lsusb list but it doesn't work Bus 005 Device 003: ID 0c10:0000 root@i5-PC:/home/john# ...
0
votes
1answer
117 views

Applying an IO redirection&audio device example in Fedora

Here is an example I saw in a webpage which uses IO redirection to make the audio device make sound. less sound.wav > /dev/audio But I cannot do it in Fedora. It outputs the input data format is ...
10
votes
2answers
7k views

How do mouse events work in linux?

This is mostly out of curiosity, I'm trying to understand how event handling works on a low level, so please don't reference me to a software that'll do it for me. If for example I want to write a ...
4
votes
2answers
7k views

ttyUSB0 permission changes after restart

I'm trying to install a device. I plug in the device which creates a ttyUSB0 file. When I open it in the program I need it for, it says the permission is denied. I type in terminal sudo chmod 666 ...
3
votes
1answer
2k views

Change the number of generated /dev/tty devices

I'm building an embedded Linux system, based on Gentoo. Using udev, all tty devices are probed with a PROGRAM stanza to determine if they are a modem. Right now the system boots up with 64 /dev/tty*. ...
9
votes
3answers
5k views

Mount printers at /dev/usb and still use CUPS

Due to a new version of CUPS, I suddenly lost the direct path to my printers that was previously available under /dev/usb/lpXXX. I used this to print directly from the command line. echo "test" > ...
4
votes
3answers
2k views

What do first column in /proc/mounts really mean in Linux?

Run cat /proc/mounts and I get this (simplified): rootfs / rootfs rw 0 0 proc /proc proc rw,relatime 0 0 /dev/sda1 / ext3 rw,relatime,errors=continue,barrier=1,data=ordered 0 0 io /etc/blkio cgroup ...
32
votes
3answers
3k views

Why are network interfaces not in /dev like other devices?

I'm mostly curious, but why aren't network interfaces in /dev? Are there any other kinds of devices that aren't represented as a node under /dev?
3
votes
2answers
274 views

PCI configuration registers problem

I'm trying to get my new Realtek RTL-8169 NIC (over CardBus) to work, but I'm having this weird problem. My lspci -x output looks like this: [root@comp]# lspci -x -d *:8169 07:00.0 Non-VGA ...
5
votes
2answers
1k views

How can I create a direct 8khz audio pipe in Ubuntu?

I'm interested in creating musical programs like these: http://www.youtube.com/watch?v=GtQdIYUtAHg&feature=player_embedded Essentially these programs just generate sequences of integers, which ...
6
votes
2answers
865 views

What’s the difference between a “raw” and a “cooked” device driver?

Does this concept only apply to terminal drivers (which is what most sites cover) or to any driver in general?
5
votes
3answers
598 views

How to get my USB key to auto mount

I'm currently working in a command line only environment. When I plug my USB key in, I see a new device file in /dev: ... sdi sdi1 ... If I simply sudo mount /dev/sdi1 /media/tmp, and umount it ...
3
votes
1answer
372 views

Vanishing permission on device file (RHEL 6.1)

I want to set world read/write permissions on a raw block device file (yeah, I know). I can set the permission to 666, but it goes back to 660 immediately after I touch it or write to it. Why? ...
23
votes
1answer
2k views

What do the device files in /dev actually do?

(Not a duplicate of Understanding /dev and its subdirs and files) I was browsing around my filesystem and for the first time I took a second to analyze my /dev directory. I was surprised by the ...
4
votes
2answers
1k views

How does /dev/fd relate to /proc/self/fd/?

$ ls -l /dev/stdin /dev/fd/0 lrwx------ 1 tim tim 64 2011-08-07 09:53 /dev/fd/0 -> /dev/pts/2 lrwxrwxrwx 1 root root 15 2011-08-06 08:14 /dev/stdin -> /proc/self/fd/0 $ ls -l /dev/pts/2 ...
13
votes
3answers
4k views

Understanding /dev and its subdirs and files

$ ls -l /dev/stdin /dev/fd/0 lrwx------ 1 tim tim 64 2011-08-07 09:53 /dev/fd/0 -> /dev/pts/2 lrwxrwxrwx 1 root root 15 2011-08-06 08:14 /dev/stdin -> /proc/self/fd/0 $ ls -l /dev/pts/2 ...
9
votes
4answers
4k views

If I connect a physical device, how can I ever know which device file belongs to it?

Say I plug in several USB drives which don't get automatically mounted. How can I find out which device file belongs to which physical device, so I can mount it for example? I'm running Mac OS X but ...
9
votes
4answers
7k views

Find out what device /dev/root represents in Linux?

On linux, there is a /dev/root device node. This will be the same block device as another device node, like /dev/sdaX. How can I resolve /dev/root to the 'real' device node in this situation, so ...
1
vote
1answer
1k views

How do I access a digital camera drive via usb after safely removing it?

In Ubuntu 11.04, I unwisely right clicked and "safely unmounted the drive" of my Sony HDR-XR150 connected via USB. Now, when I plug my digital camera into my computer via USB, Ubuntu either doesn't ...