A family of Unix-like operating systems using the Linux kernel. If your question is about a certain distribution only, use a more specific tag.

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Virtual filesystem on linux to translate contents (fuse?)

Is there some existing software to use a virtual filesystem to translate file contents? (read-only or read-write). It would be interesting to be able to generate a view on a code-base, for example. ...
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191 views

Weird IP in Linux Mint 17

I installed Linux Mint over a shared Ethernet connection from my laptop and installed my Broadcom Drivers over that shared ethernet connection, and I noticed that my Linux box is on the wrong gateway. ...
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249 views

Turn all workspaces into windows or split screen to show several workspaces at once

I recently installed Ubuntu 14.04 and I'm a long time Windows user, I was used to have a lot of windows open at the same time, I was told I could use workspaces in linux to replace the need for ...
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694 views

Why is avahi-daemon excessively spamming my log files?

My VPS provider recently suspended my account for "participating in a DoS attack". Since I've naturally done no such thing, I can only assume it was a security breach, and am now investigating what ...
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825 views

How to force the Linux kernel reclaiming cache memory rather than using swap?

I have a PostgreSQL-driven web service on two Debian servers, one a vhost running Linux kernel 3.2.0-2 with 2GB RAM and the other a dedicated server running Linux kernel 2.6.26-1 with 6 GB RAM. ...
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99 views

How to monitor free space and automatically delete oldest files on Linux?

I have a software application that continually writes files to disk at high speed. Each file is modest in size (less than 10 MB or so), but they are created every 1-2 seconds underneath a specified ...
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262 views

Debian shutdown takes a long time (RAID/crypt related)

I'm running Debian Jessie and recently my shutdown has been taking a long time. When I sudo shutdown -h now I'm sent to a blank screen except for a blinking cursor which sits for ~1 minute. It then ...
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148 views

Issues with file ownership after git push

I have a server at home running Ubuntu 13.10 configured as webserver and git repository. If I push my project from my system to the server a post-receive hook is executed that moves the files ...
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143 views

Multi-boot encrypted operating systems on EFI

I'm getting ready to "redo" my desktop computer, encrypting all of my partitions as I install the operating systems. I currently boot with EFI. I'm looking to install both Ubuntu 12.04 (really ...
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72 views

Detect vga signals from command line

Currently I am working on Ubuntu 12.10. I am using vga2usb device for interacting with other vga devices such as monitors. Is there any command line utility or any specific command from which I can ...
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72 views

Printer configurations on Linux: Providing privilege to normal users

I am on a CentOS machine. Everything is working fine, I can configure the printer with the GUI System->Administration->Printing. It asks for root password and then I can make the configurations. ...
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403 views

Should the CPU usage go up to 100% when swap happens on Linux

I had been running a demo system on Linux with the following kernel: 2.6.32-400.1.1.el5uek #1 SMP Mon Jun 25 20:25:08 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux And as soon as swap happens, the CPU ...
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35 views

Best practise for debbuging hdd

I just logged onto my machine when suddenly ls gave me an Input/output error. After rebooting the machine /dev/sda1 could not be mounted. dmesg results in : [ 545.691453] EXT4-fs (sda): VFS: Can't ...
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185 views

LC_LOCALE settings interactions between Mac OSX and LINUX via SSH

I have been struggling with the following problem for years now. I have never been able to solve it, and I adopted several workarounds to keep being able to work. However now I can't stand it anymore, ...
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2k views

Forcing ext4lazyinit to finish its thing?

Is there any way to 'force' ext4lazyinit to finish the thing it does with maximum priority? Something like "I don't care about my system's ressources, just do your job as fast as you can"? I should ...
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69 views

What does dbconfig-common do? Should I use it?

For several packages, the installer asks you if you'd like to use 'dbconfig-common'. After some Googling, I can't really find (in plain old English) what the heck that package brings to the table, ...
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185 views

Is there a tool like dm-crypt/luks using RSA encryption?

Is there a library/tool available for linux, similar to dm-crypt/LUKS using RSA encryption instead of symmetric ciphers? I want the "public side" to only be able to create these volumes, and the ...
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815 views

Debian Linux - “hcitool scan” does not find devices

I use free VMware player with Debian 7 image. I use Cambridge Silicone Radio Bluetooth USB adapter "hciconfig" shows me two interfaces (I don't know why two, and I don't know with which I should ...
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362 views

My custom fish shell prompt keeps resetting every reboot

I switched to fish shell a month ago and I'm quite pleased with it. But recently, my custom prompt keeps resetting to the default prompt every time I turn on my PC. When opening the terminal, I'm ...
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422 views

NTP Multicast configuration

I'm trying to get NTP multicast set up between a few computers. Right now I'm getting NTP multicast packets from a computer that I have neither access to nor information on (let's call that A) that is ...
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0answers
228 views

Cannot boot NixOS Install CD

I am trying to install NixOS on an Acer laptop. When I try to boot off of the install CD, the system starts up and shows the Acer logo. Then, the boot menu of the CD appears, but it only displays on ...
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206 views

Ext4 allocation pattern with random writes in sparse file

If I create a large (a few GB) sparse file in ext4, and then write randomly throughout the length until all 4k blocks have been "touched", in the absence of other heavy write load, can I expect that ...
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436 views

File transfer tools for linux with support of zero-copy transfer

Are there small and simple file transfer tools for Linux, which can use "zero-copy" style of transferring files from HDD (SSD) to tcp socket, and back? I want to often send huge amount of ...
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247 views

Behaviour of Caps-lock in Linux on VirtualBox, OSX Host

I'm running Ubuntu under virtualbox on a MacBook Pro and I'm trying to remap the Caps-Lock key to mod3 so I can use it as a replacement for the Alt key in Xmonad. I can remap the keysyms but the ...
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1k views

Fedora 20 - bootmgfw.efi' not found - GRUB2

I have a problem with the bootloader after the installation of Fedora 20. Today I've installed Fedora 20 overwritng Ubuntu 14.04 without experiencing trouble. When I rebooted the pc, I noticed that ...
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194 views

3g modem is not recognized as an ethernet device without rebooting

I have two CentOS5 servers with kernel versions 3.4.52 and Huawei e353 usb 3g modem. When I plug the modem to my server usb_modeswitch runs and I can see the modem as an ethernet device with ifconfig ...
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358 views

Redundancy: LVM+mdadm or LVM internal RAID

The task is to create LVM storage for virtual machine images. So LVM will be used in any case. There are two ways LVM providing redundancy: block mirroring lvcreate -m 1 --mirrorlog mirrored -n ...
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432 views

linux catalyst and three monitors

I just switched from opensource ati driver to catalyst because I had many crashes on my linux box when playing flash videos. It looks like with fglrx my system is more stable, but I lost my third ...
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308 views

X11 evdev mouse generates duplicate events

Lately my x11 server started registering several duplicate mouse click events per single click. I've tried upgrading xorg server and drivers, but it didn't help. Using different mouse doesn't help as ...
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0answers
303 views

rasperry pi / debian / directory mount issue

I have trouble regarding to external USB disk write operations I am using Rasperry Pi box with Debian Linux root@raspberrypi:~# umount /dev/sda1 root@raspberrypi:~# mkdir /media/extGrayUSB ...
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63 views

Sudo works as su

Ive observed kind of strange behaviour. I have openSuse and when Im in console and want to gain root access for executing one command, after typing sudo it like switches me as if Id type su. ...
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328 views

How to set timeout for svn update?

I have about hundreds of server(all has its own working copy), fabric(python ssh tool for administration) will issue multiple svn update to those machines, many commands (10% machine) return ...
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65 views

using pam_mount in WLAN setting

I thought this should be a simple exercise here, but obviously I couldn't find a solution, yet. I use KDE on Ubuntu 12 LTS. I want to use libpam-mount to mount a nfs share to a directory within user's ...
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131 views

Preventing unused spare hdd from spinning up during suspend and shutdown

I recently replaced my sata hdd with an ssd, and keeping the hdd in as a spare. It's not used, not event mounted to filesystem. Yet, when suspending or shutting down the system, it quickly spins up, ...
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0answers
387 views

stdbuf not working while unbuffer does

I am trying to apply timestamps to stdout of a process. For the proper timestamps to be applied, I attempt to unbuffer stdout of the process. This works with unbuffer but not with stdbuf as I would ...
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0answers
271 views

xwindow and poor man's video wall

We have a "video wall" at my workplace. It consists of 8 43" - 50" screens. 5 of them support full HD resolution, remaining 3, do not. Screens also have different video inputs. Some support HDMI and ...
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0answers
401 views

chpasswd and passwd not updating /etc/shadow for root user

I'm having a weird problem, and I don't know if I've screwed something up or this is the way it's supposed to be and I never noticed.. Using passwd and chpasswd to change a users password works as ...
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0answers
224 views

Creating multiple screens in a for loop to run parellel programs and sending commands to each

Before flagging this questions as redundant, i have read and tried every answer to similar questions with no success I have this loop where it traverses a directory structure, and runs a program ...
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414 views

Mounting shared directory for chroot users

I ran in to an interesting issue with mounting that doesn't make any sense to me. Basically I have setup a chroot environment for SFTP users, they each have a chroot directory with a format of ...
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0answers
2k views

Synergy client won't connect, despite open port?

I want to use a Debian KDE desktop computer (network name bradbury) as the server, and a Windows 7 laptop (network name Clarke) as the client. I have used this setup before without problems, but then ...
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169 views

ssh proxycommand equivalent on server

Lets say we have three machines me, proxy, server I would like to have an ssh connection to server, so normally I would do me$ ssh proxy proxy$ ssh server server$ # and here we are ssh proxy ...
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0answers
4k views

Ubuntu network keeps giving Network Disconnected - You are now offline message

On the face of it, you will find that this is a common question but please read it completely to understand the specific issue that I have. I am running Ubuntu 12.04.4. I keep getting this network ...
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203 views

Linux LUKS and choice of filesystem

Which filesystem displays the best performance when running on a LUKS encrypted partition? Does it make sense to use f2fs when the LUKS partition is on an SSD, or does the device-mapper abstraction ...
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0answers
271 views

No protocol specified

I can't run any of the graphical applications from root terminal. No protocol specified xhost: Unable to open display ":0.0" Any idea what to look for?
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0answers
120 views

Linux Ubuntu System Error

After I have given myself the access rights for directory /usr and all its contents with sudo chown -R USER /usr my Ubuntu 12.04 System totally fails. E.g. Internetconnection is not possible ...
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0answers
82 views

Determine how many physical/hardware USB host controllers I have

Out of simple curiosity, I'm trying to determine how many hardware USB host controllers my machine has. lsub lists seven root hubs, and lspci -v and lshw both list seven host controllers. I'm ...
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123 views

Socksify php script

I am trying to socksify php script network connections, however I am unable to do that, script ignores the socksifyer, just connects directly. I tried using tsocks and torsocks. tsocks php ...
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0answers
973 views

Multiple Linux distributions return “Fast TSC calibration failed” when running on Hyper-V

Client Hyper-V on Windows 8.1 Pro host with Intel Core i7-4800MQ processor. Several Linux distributions, including openSUSE and Kali Linux, return the following error message when booting up in a ...
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39 views

How to type special characters in Linux when Russian layout is active?

The way to type special unicode characters in Linux is to press Ctrl + Shift + u and then to type the character number. But this method doesn't work when Russian layout is active. So if I'm typing in ...
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254 views

How to obtain a version of ImageMagick compiled for OpenCL (Linux)

For reasons I do not understand, ImageMagick requires a special compilation to make use of OpenCL drivers on the host machine. Does anyone know of a place where I can obtain a Linux version compiled ...