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  • What is the CPU microcode?

    - by golem
    Today after unpacking the initramfs file from my Linux /boot directory I found that it contains the GenuineIntel.bin file, and that that file is an image of what is called the CPU microcode. Then I found articles on ArchWiki and Wikipedia describing the subject. Now I'm not sure that my vague understanding of the subject is correct. Can anyone please explain what the CPU microcode is in plain English?

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  • VirtualBox without X server

    - by nccc
    I want to run a guest operating system under a Linux host with VirtualBox, but I don't want to run from within X. I don't want a headless configuration, I don't want to run VirtualBox in the background, I don't want any remote protocols. I just want the guest OS to take control of my console (keyboard, mouse and monitor) and render to the framebuffer directly, not from within an X window. Is this possible?

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  • recommendations for public facing file server

    - by Seaweed
    I've been asked to setup a server for exchanging non-critical company data e.g. marketing PDF's etc. Can anyone recommend a Linux-based solution I can use? We're looking for something with a really simple GUI front end here... I've already setup SFTP but they found the process 'too-techy'. Any ideas would be really welcome... Thanks!

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  • Two network cards latency

    - by Ross W
    I'm trying to setup a network architecture where one network is a low-latency low-bandwidth tcp control system (GBit), the other is a high-bandwidth udp (maybe tcp) network that could get saturated (GBit). If I have two NICs inside a server running Linux. What happens to the low-bandwidth/low-latency network when the high-bandwidth gets saturated. Does each Ethernet card get the same amount of priority inside the kernel or would the low-latency network suffer from the high-bandwidth being saturated?

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  • How to do something like `mplayer movie.mpg` from ssh and it play on the current display?

    - by Earlz
    I've set up a little media center computer running Arch Linux. I want to eventually get it so that there is no keyboard or mouse required. Right now I want the solution to be SSH. My problem is that when I do something like mplayer movie.mpg over an ssh shell, I'll just get vo: couldn't open the X11 display ()! How do I get this to work correctly and play on my TV(the display the media center computer is hooked to)?

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  • How can install scripts determine which are the correct equivalents for /usr/lib for 32- and 64-bit libraries?

    - by Randalli
    I have an SDK that must install 32-bit and 64-bit files in the correct places under /usr/lib for a variety of Linux distributions. For example, it appears that for Fedora, /usr/lib64 is the 64bit lib, but for Debian based systems, /usr/lib is the 64bit directory. I want to find out if there is a reliable way to determine the correct locations. More specifically, is there a way an install script can determine programmatically which are the correct equivalents for /usr/lib for 32- and 64-bit libraries on a given distribution?

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  • Manually closing a port from commandline

    - by codingfreak
    I want to close an open port which is in listening mode between my client and server application. Is there any manual command line option in Linux to close a port ?? NOTE: I came to know that "only the application which owns the connected socket should close it, which will happen when the application terminates." I dont understand why it is only possible by the application which opens it ... But still eager to know if there is any another way to do it ??

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  • application to make shell typing easier?

    - by ajsie
    i wonder if there is any application for the linux bash shell to make it more easier to type. eg. if i type "c" then maybe it would give me all commands that starts with that letter for example "cd", "cp" etc. then if i type "cd" and press space it give me all the parameters for that command. is there application of this kind to automatize command typing?

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  • Changing file permissions in kernel.

    - by Mehrdad
    I am writing kernel module(C in Linux) and I want to change the permission of the other files in it. any solution? since I am in kernel I can't use chmod syscall and ... thanks for your help This is my Makefile: > obj-m += ca.o > > all: > make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules > > clean: > make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean And this is my Code: > #include <linux/string.h> > #include <linux/mm.h> > /* Snip, tons of includes (all of them :))*/ > #include <linux/delay.h> .... int procfile_write(struct file *file, > const char *buffer, unsigned long > count, > void *data) { ... sys_chmod(path, per); ... } ... When Making it gives a warning: WARNING: "sys_chmod" [file] undefiened and when loading the module with "sudo insmod" it gives this error: Unknown sybol in module it seems that this error happens especialy in kernel modules. any idea? again thanks!

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  • Firefox trying to download local .swf files

    - by Levans
    I'm quite annoyed with my firefox and Flash files : When I try opening a .swf file with it: If the file is on the web (via http://...), it plays normally in browser If the file is local (via file:///...), firefox only show me a dialog to download it It tried opening a web swf file, downloading it then opening it locally, it's the same. So I guess it's a firefox problem. I'm on Gentoo Linux, and it started today, without any apparent reason.

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  • Recovering Root Password

    - by Melvin
    This hasn't happened to me yet but I am documenting this process just in case. Let's say I can't remember my root password for my linux server. Every example of this scenerio that I can find says to first boot into single user mode. What if my server is currently running in multiuser mode and I have no sessions open as root. How exactly do I order an orderly shutdown without root access so that I can begin the password recovery process?

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  • Wrapping a point-to-point link

    - by user3712955
    I'm using a pair of IP radios (non-WiFi) to bridge my office engineering LAN (172.0.0.0/8) to a lab in another building. The radios work fine, but they expose a web management interface I'd like to hide, and they also generate traffic (ARP, STP, and more) that I need to keep off my (very, very clean) LAN segments. I have some ARM-Linux boards (similar to Beagle/Panda/RasPi) running Ubuntu, and I've put one at each end of the link, between the radio and the LAN. Each of the boards has 2 wired Ethernet interfaces, eth0 and eth1. The LAN segments are connected to eth0, and the radios are connected to eth1. I'd like to accomplish the following: Keep radio-originated traffic off my LAN segments! Hide all services provided by the radio (web, ssh, etc.) Transparently pass all traffic between the LAN segments (including things like ARP). The above also applies to the ARM-Linux boards: No stray traffic my LAN from them either! I'd like the system to look like a switch: LAN packets arriving at one eth0 appear at the other. And neither eth0 should have an IP address: The working system should behave like a CAT6 cable with some latency (instead of ARM boards and radios). Unfortunately, I'm confused about how to properly configure the ARM Ubuntu systems. What I'm guessing I need is a bridge on each board (br0?) and a VLAN (vlan0 or eth0.0?) to isolate the LAN traffic from everything else as it passes through the ARM boards and the radios. Then I need some kind of a firewall to block sending anything out eth0 that isn't from the other eth0 (via the VLAN). I've looked at the ip and ebtables commands (especially -t broute). While the concepts sorta-kinda make sense, I'm completely lost in the details. Edit: In the perverse case that a system on one of my LAN segments has the same IP address as one of the radios, or as eth1 on the ARM-Ubuntu boards, a VLAN won't work. Which I believe means I need to tunnel all traffic between the two eth0 interfaces to get that "like a wire" behavior. Help? Finally, I'd like to have a way to temporarily expose services on the ARM boards (ssh) and the radios (web) for maintenance purposes. Ideally, it would expose an IP address with ssh available on port 22. Once connected, I figure I'd start an X11 session and run a browser on the ARM board to access the radios. Or something. I could login via the console to enable/disable this, or perhaps could use a GPIO to trigger a script. I feel I've identified most of the pieces needed to make all this happen, but I have no idea how to combine them to make a working system. Thanks!

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  • How to give user read/write access to folders?

    - by Will
    I'm running a certain script that is using a non-root user to do the following... mkdir: cannot create directory `/srv/www/example.com/releases' *** [err :: 12.23.45.789] : Permission denied How would I allow user xyz to have permanent permissions to do so and still keep this web server secure? Also is it possible to make it recursive for all subfolders? I know its probably chmod something but I'm not that linux savy, thanks.

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  • Unable to find javac after installing OpenJDK 1.6 and 1.7

    - by popasmuerf
    I am currently at a loss as to why this is happening. I did some basic research by running: whereis javac -and- find / -name javac ...and I came up with nothing I searched the web for answers but they all seem to focus on javac existing on the filesystem, and that needs to be done is to restore a missing sym-link. Has anyone run up against this issue and found a solution ? I have attempted to install openJDK on Scientific Linux 6.3 with the command: yum install openjdk Thanks!!!

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  • How can I tell if my hard drive(s) have Battery Backed Write Cache?

    - by Riedsio
    How can I tell if my hard drives have a battery backed write cache (BBWC)? How can I tell if it is enabled and/or configured correctly? I don't have physical access to my server. It's a GNU/Linux box. I can provide supplemental incremental information/details as requested. My frame of reference is that of a DBA -- I have access and privileges, but (usually) only tread where I know am supposed to. :)

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  • How to send Ctrl+Alt+F1 to window (to switch terminal remotely, not locally)?

    - by Vi
    when I press Ctrl+Alt+F{1..12}, it switches me to other virtual terminal. When I have VNC/rdesktop client (and there it is VMWare/Virtualbox with other Linux) I want to switch virtual terminal remotely, but just pressing Ctrl+Alt+F1 switches things locally. VirtualBox/VMWare often provides special means to send Ctrl+Alt+Del, but not Ctrl+Alt+F1. (I already know that I can log in over ssh and chvt)

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  • How do I automatically empty the trash on logout?

    - by Jonas
    Users on a linux (CentOS4) machine I administer consistently forget to empty the trash. Since the people work on big files, this can fill up the /home partition very quickly. Therefore, I would like to create a script that automatically empties the user's trash whenever they log out. How would I do that?

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  • How does the operating system know which parameter to pass to /etc/init.d/ ?

    - by iDev247
    I've been working with linux for a while but in a rather simple manner. I understand that scripts in init.d are executed when the os starts but how exactly does it works? How does the os know which paramater to pass to a script? To start apache I would do sudo /etc/init.d/apache2 start. If I run sudo /etc/init.d/apache2 it doesn't work without the start. How does the os pass start to the script?

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  • websites painfully slow sometimes

    - by travolto
    i have a 1and1 account dedicated linux machine never had a problem with it. httpd and mysqld seem to be running just fine. ping and trace are also fine.. one domain on the machine is www.hundig.com any ideas where i could look why it is so slow or not loading at all? when i reboot it seems faster. just rebooting httpd doesnt change anything.

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