General :: Device / Special File Clairification Requested
Oct 1, 2010
Device/Special file Clairification Requested.I'm reading a short article on Device/special files because it is related to VFS. This article has this paragraph that has to many pronouns in it to get an understanding of. URL..."In short, a device file (also called as a special file) is an interface for a device driver that appears in a file system as if it were an ordinary file. This allows software to interact with the device driver using standard input/output system calls, which simplifies many tasks."
What does a Device file have to do with the Application and the Driver communicating? Wouldn't the order of data transfer be , Application to driver and then to Device file?
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Jul 3, 2010
mount: special device /dev/scd0 does not exist
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Sep 28, 2009
I had Windows 7 and Windows XP. It was 3 partitions in one HD (two OS' and one for files) and another separate HD (which doesn't have any system, it's just media files and stuff). When booted, I used to get the Windows 7 screen, that allowed me to either boot 7 or XP. I thought I had tested 7 enough and wanted to try Ubuntu, so I (from the Ubuntu CD which I downloaded and burned) deleted the 7 partition and made a 2GB swap partition, and, what was left, an Ubuntu partition on which I installed it.
Now when I boot I get an Ubuntu boot screen that shows several Ubuntu options and a WinXP option. Ubuntu works fine, but if I choose WinXP, I get "Error 12: Invalid device requested". I didn't change anything more than what I said. The details for the WinXP boot option seem to be:
rootnoverify (hd0,4)
savedefault
makeactive
chainloader++
What can I do to be able to boot WinXP again? (and also Ubuntu, whenever I want to). The only thing I can think of is using Windows XP CD's restore thing to restore the boot menu, but that would stop me from using Ubuntu...
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Dec 4, 2009
I have installed Windows 7 followed by Fedora 11. Everytime I install Fedora 11 with Win 7, the first to boot, I get BOOTMGR missing. Later I used "df -h" command to see the disk file usage fdisk -l" to see the info regarding Disk Partitions. Went into the /boot/grub/menu.lst and modified the order. I set the partition where I find the bootmgr.exe.mui, there was another file named "memtest.exe.mui in the same file.
I navigated to the above said through Fedora 11. Located inside the Win 7 installed directory /boot/en-US/
When I changed the menu.lst file, I get a new error Error 12: Invalid device requested when I tried to boot Win 7. Does that mean that Fedora 11 GRUB is not getting the bootmgr.exe.mui since its 2 levels inside the boot directory ??
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May 25, 2011
I have message: error 12: invalid device requested.It happen when i choose ubuntu partition. before this error message the netbook run perfectly with dual boot. ubuntu is 1st option winXP is 2nd option from the list(maybe grub ?) Since i want winxp as the 1st option instead ubuntu,i change the file /boot/grub/menu.lst. what exactly i change is just cut and copy the winxp part to above ubuntu part.
if i press 'e' in ubuntu show:
root (hd0,6)
kernel /boot/bla..bla.bla..
initrd /boot/bla..bla.bla..
[code]...
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May 21, 2010
Simple logging script that allows user to enter quick notes and questions, but I can not get it to pass punctuation '?. no matter what I type after 'n' i need that to be inserted at the end of the working project note file.Any help and working examples would be appreciated, but please also direct me to the proper reading material so I can learn something - not looking for someone to just do it for me.usage:
Code:
bob@smith:~/notes$ n bob's script sucks?
>
[code]....
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Feb 20, 2010
I am running gentoo openbox(rox file manager and desktop) I installed Digikam and Amarok. But I have problems with files which include special character in their names(such as �,�, �,ğ... ) The files are shown with strange and weird characters in the file dialogs of Digikam and Amarok.
I don't have this problem in other applications. I can create files with special character included. I think some settings do not agree with KDE4. How can I solve this problem? Does anyone have an idea? I also installed KDE systemsettings program but could not find a relevant config option for character encoding.
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Apr 29, 2011
I am having difficulty getting sed to replace a string of text in an XML file, despite the fact that I have no trouble using grep to find that same string. Since the new string and old string to be replaced contain a lot of special characters, I thought it best to store them in variables as opposed to using a slew of backslashes:
OLD_STRING='<property name="webServiceHost">${jboss.bind.address}</property>'
NEW_STRING='<!--<property name="webServiceHost">${jboss.bind.address}</property>-->'
[Code]....
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Sep 12, 2010
The CD-ROM on this computer, my ubuntu laptop, does not seem to be working properly. It works on and off. I burned a .iso image yesterday but today I can't get it to even read the CD in my drive. I just want to read the CD to see if it is the Ubuntu Live CD I burned a while ago or if it is the Vista Recovery CD.
TL;DR: CD-ROM isn't working properly. When I click on the drive this is the error.
Code:
mount: special device /dev/scd0 does not exist
P.S. I am trying to get Windows Office to install using Wine because I am tired of windows. I know that open office is great. but I have to have excel 2007 and word 2007 for school.
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Sep 30, 2010
I've just upgraded to the new version of Ubuntu (10.04) and I've got a problem with the mounting configuration.
My PC access to a NAS server which is running samba. Everything worked great before upgrading
In the /etc/fstab, I added the following line :
Code:
//nas/share /mnt/share auto credentials=/root/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0
and the system always replies :
[Code]....
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Apr 15, 2011
I've got an LVM2 VG containing 1 LV running on SLES11 SP1.
I have an entry in /etc/fstab to remount them at boot:
Code:
/dev/myVG/ibmLV /opt/IBM ext3 defaults 0 0
Whenever I reboot the whole VG disappears and I find the following in /var/log/boot.msg:
Code:
<notice -- Apr 15 12:35:55.954677000> boot.localfs start
Waiting for /dev/myVG/ibmLV . no more events
[Code]....
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Mar 21, 2011
I made a duplicate of a Centos 5.5 system disk with dump (dd if=/dev/sda of=/dev/sdb). No device files for sdb were created, but I guess that's not too surprising. I rebooted, and the device files were created. But how would I create them if I wanted to avoid the reboot?
I looked around for info on mknod and MAKEDEV but didn't find a lot.
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Sep 2, 2010
We're in the process of implementing an offsite backup of all our servers to a remote Linux server. We're using rsync over ssh.What I've found is that characters such as ±, ¶,´ and £ are replaced on the Linux server with underscores.I don't mind if it changes these characters in the filenames of documents, but when it renames a language pack from Espa±ol.clx to Espa_ol.clx, it could cause issues for us further down the line.
What do I need to do differently to make the special characters copy over correctly? For the initial sync which will take place locally, before the machine is moved offsite, I have SAMBA enabled. I am able to copy files from Windows to the Samba share, retaining the original filename, though it looks different in the Linux directory listing, i.e. t̻st becomes ĻstThese files get deleted by rsync when it runs, as it does not match the filenames.
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May 2, 2010
I have created a logical partition (/dev/sda5) and have formatted it with an ext3 filesystem and given it the label PHOTOS.
# mkfs.ext3 -L PHOTOS /dev/sda5
If I mount it to my /PHOTOS directory manually, it does so correctly. However, when I try to automount, it gives me this message:
# mount -a
mount: special device PHOTOS does not exist
I've entered this line in my fstab file:
PHOTOS/dev/sda5ext3defaults0 0
I'm just not sure what's happening; I've never had trouble mounting a filesystem before. Oh and it's a RHEL 5 installation.
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Dec 9, 2010
why I'd be receiving this error. I have created a partition and filesystem and put the label in fstab. Everytime I reboot the server it is unable to mount the filesystem. However I am able to mount it manually.
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Aug 23, 2011
I've bought an X10 Home Automation USB interface: the CM15.
This is the information lsusb gives:
skerit@KIP-DU-SKER:~$ lsusb Bus 008 Device 002: ID 0bc7:0001 X10 Wireless Technology, Inc. ActiveHome (ACPI-compliant)
But this tells me nothing about where the device file is! How can I find that, or create one myself?
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Mar 1, 2011
I seem to have another issue with my raid system
mount -a
mount: special device UUID=fb518c74:2b6bd0f4:66db5ce6:7e004239 does not exist
but when i do mdadm -vv --detail /dev/md5 ... this is what i get --->
/dev/md5:
Version : 1.1
Creation Time : Fri Feb 25 14:07:36 2011
Raid Level : raid1
[code]....
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Sep 30, 2009
i used my windows box to connect to ftp(fed box) and i keep getting an error saying "The requested name is valid, but no data of the requested type was found." does anyone know why i cant connect?
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Feb 5, 2010
I'm trying to install Fedora 12 from a DVD created by an iso I downloaded. When the install gets to the point of actually installing files, I get a message saying that it can't find 'authconfig-gtk-6.0.0.-2.fc12.i686.rpm'. I looked at the DVD for that file and it isn't there. I found 'authconfig-gtk-5.4.13-1.fc12.i686.rpm'. Any ideas how to fix this? The DVD passed the media check at the beginning of the install. I'm not exactly a newbie in Linux as I have some experience with it.
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Jun 19, 2010
I am downloading some files via tftp from the server (call it my server) and I need the server to be case insensitive to the file names requested. That is If I request "SoMe.TTL" and the actual file name is "some.ttl" it should send "some.ttl" back! Right now it is case sensitive and is a pain in the but because some windows clients upload files to that directory and the names can have any case. Furthermore, the file request mechanism must allow the user to input the required file name, hence the user can write using any case. Can the tftp-server solve cases by it's own? How about dnsmasq's internal tftp server? Ok, maybe I wasn't explicit above:
I need to make the fedora tftpd-server Case Insensitive!
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Apr 14, 2010
I'm running Ubuntu 9.10 and Gnome-Do 0.8.3.1. I have two issues I hope someone can help with.First I've managed to add two folders to the doc, however when I hover over the icon the name is displayed as "..." This might be because the path of the folder is "/home/eric/Desktop/500" which is a link to "/mnt/500" I cannot add the folder without the error listed below. When trying to add folders, and some applications I receive the error:
"Docky Error - Docky could not move the file to the requested Directory. check file name permissions and try again."
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Apr 4, 2010
how i can say fedora that if a file has a special suffix to open it with a special app?? such as .oct with octave or ...?
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Jan 15, 2010
I have a Linux (Kubuntu) system with a large (~20Gb) file which I would like to mess with. Specifically, I want to copy the entire contents of another large file (~12Gb) to the middle of this file, and keep the bits of the file which are not overwritten.This is what I want to happen, with the text between the pipes representing file contents:Before:
outfile: |abcdefghijklmnopqrstuvwxyz|
infile: |123456789|
After:
[code]....
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Mar 24, 2011
I have a file with special characters that need to be replaced. I've been working on this for a day and have run out of time.
Example: FILE='/var/tmp/S0000000.LOG.March-24-2011:10:51.tar'
Need to replace the ' with a " on all lines in the file.
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Sep 8, 2010
Everything in Linux is a file, right? And everything can be represented by a file? Is there some way I could create a block device file that represents (i.e., provides an interface to) this image file? If so, then I could use fdisk on the device file to split it into partitions, format the partitions, and then mount them as directories. I could create a file system within a file system, which would be fun.
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Jan 26, 2011
I'm having issue when trying to change a line in a file
[Code]....
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Mar 30, 2011
1) sar -d gives: Requested activities not available I need to enable it, but can't find out how to do it. Can you please help? I am on Red Hat 5.6 sar -u works though as configured by systat in /etc/cron.d
2) Also, I have another system Red Hat 4 where it's working but I searched through all /etc/*cron* and couldn't find anyplace where it's enabled even though sar -d works
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Jan 7, 2010
here we have an older digicam (Jenoptik/Exakta Model "DC 22", if someone might want to know) that can be switched between some "PC Camera mode" and "Mass storage mode".Unfortunately, if attached to USB, it is always recognized as
Code:
UDEV [1262910483.475886] add /class/video4linux/video0 (video4linux)
lsusb tells:
[code]...
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Jul 18, 2011
I have installed a new device in linux.If I enter lspci, i can see the information of this device.But, I donot which file in dev is mapped to this device.
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Apr 27, 2010
Now I connect usb keyboard to my machine, and I would like to know how I can get device file name of this usb keyboard. I know it is /dev/input/event# file,but which event# file? I tried to do [dmesg | grep usb] , but kernel message don't tell me what I would like to know.
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