Questions specifically about Linux, as opposed to Unix-like systems in general, or to questions about a specific distribution or program.

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0
votes
0answers
19 views

impossible to make fsck

I'm trying to make a fsck to a pendrive and it says me: e2fsck 1.42.8 (20-Jun-2013) Pass 1: Checking inodes, blocks, and sizes Error reading block 40402759450689 (Invalid argument). Ignore error? ...
0
votes
1answer
2k views

How to remove Oracle Wallet using orapki?

Hi i'm on Centos using oracle 11g And i've created a wallet using : $ orapki wallet create -wallet /u01/app/oracle/admin/DB11G/wallet -pwd WalletPasswd123 -auto_login Now i want to remove it to ...
-1
votes
1answer
34 views

to make password less login to same linux server with same user [closed]

I have performed below steps to make password less login ssh-keygen -t rsa copy ~/.ssh/id_rsa.pub into authorized_keys chmod 600 ~/.ssh/authorized_keys but still unable to make password less ...
2
votes
0answers
34 views

Difference between 'sar' and 'iostat' commands

With sar and iowait, we can get CPU time utilization. But, when I executed both commands, I could see significant differences in their outputs. > iostat && sar 1 1 Linux ...
3
votes
2answers
2k views

volume hot keys in Crunchbang don't work

I've spent 2 hours on this and still can't figure this out. It's driving me insane. Please save my sanity. When I press mute, the pnmixer control in the top right shows that I've pressed mute, but ...
0
votes
1answer
446 views

how to have root partition LVM for RHEL 5.8 64 bit on AWS EC2

I am new to this and I have to create a RHEL 5.8 Amazon Machine Image (AMI) in which the root partition should be a logical volume. I know how to create a data partition as a logical volume but am not ...
96
votes
26answers
16k views

Tracking down where disk space has gone on Linux?

When administering Linux systems I often find myself struggling to track down the culprit after a partition goes full. I normally use du / | sort -nr but on a large filesystem this takes a long time ...
6
votes
3answers
91 views

Feed all traffic through OpenVPN for a specific network namespace only

I am trying to set up a VPN (using OpenVPN) such that all of the traffic, and only the traffic, to/from specific processes goes through the VPN; other processes should continue to use the physical ...
0
votes
1answer
40 views

Why does sendmail's status keep changing to “dead but subsys locked”?

Every day I get the output of sudo service --status-all emailed to me using crond. The server is a CentOS 6.5 web server which I use to host a few WordPress websites. Occasionally sendmail will change ...
0
votes
1answer
287 views

Opendns setup failed. How to fix it?

I have problems trying to configure OpenDNS. I have contacted OpenDNS support but they did not answer. I cannot access websites like Twitter and Facebook. I tried welcome.opendns.com (did not ...
4
votes
1answer
65 views

How to compile programs on Linux systems when I don't have sudo privileges to install the dev dependencies [duplicate]

How should I go about compiling programs that depend on libraries whose development packages (headers and such) aren't pre-installed on the system when I don't have sudo access? In this particular ...
1
vote
1answer
2k views

Execute a script as root at boot on Fedora 15/16

I try to run a script (tpfand) at startup, and it asked to be root to execute it. This is a script to control the fans on Thinkpad computers. Despite several attempts, I could not get ...
0
votes
2answers
1k views

Failed dependencies trying to install package 'libxml2'

I am trying to install libxml2, but my system complains about dependencies. The dependent packages exist on system. The ultimate goal is to install xml_grep2, I have been trying various methods ...
0
votes
1answer
306 views

Playing or converting .dv4 files in Linux

I need to find a way to playback a number of .dv4 files on Ubuntu 12.04 and Fedora 20, possibly after having converted them to a more conventional format. So far I have managed to convert the files ...
1
vote
1answer
753 views

Windows 8.1 not appearing on grub after Linux Mint 16

I had followed a tutorial to install Linux Mint 16 Cinnamon and it works perfectly fine, currently using it to post this question. But when grub loads the only 3 options I am given, are Linux Mint, ...
0
votes
0answers
22 views

Is there an OS for VR/Oculus Rift? [closed]

I had started reading this book the other day and was wondering if there were any resources (blogs, books, screencasts, etc) scrutinizing the GUI design process. Particuly, my focus is the VR user ...
2
votes
0answers
18 views

Defining Languages Available at boot - LiveCD

I am trying to create a refined version of the buggy uck for customizing Ubuntu LiveCD ISO, here it is if you're interested in helping. NOTE: The process is straight-forward, except when customizing ...
0
votes
3answers
33 views

how to disable time sync in VM guest?

I have a desktop (centos 6) that has a VM guest (RedHat 5.5). I just try to set the date to past time in VM guest. And it works. However, after 50 minutes, the time is sync to current time. After I ...
43
votes
14answers
29k views

Determine the size of a block device

How can I find out the size of a block device, such as /dev/sda? Running ls -l gives no useful information.
-2
votes
0answers
22 views

Shell script working like rasdial in windows [closed]

I want a shell script that works like rasdial in windows. I dont where to start. Even a lead will do.
11
votes
1answer
669 views

What do all the pictures on the front of the “Unix and Linux System Administration Handbook” represent? [duplicate]

I'm a newcomer to Unix and Linux, and I've been trying to get up to speed on everything. One of the guides I've used is the "Unix and Linux System Administration Handbook" It's a pretty great book, ...
4
votes
2answers
221 views

What are all the items on the cover of the “Linux Administration Handbook”?

As I mentioned in What do all the pictures on the front of the "Unix and Linux System Administration Handbook" represent? I'm fairly new to Linux and Unix. @jasonwryan provided an excellent ...
4
votes
1answer
283 views

Windows Changes File Permissions in Samba File Shares

I have mounted an external USB drive that is used for file shares on CentOS. All of the clients access the shares are Windows XP or 7. Within Windows, I use the "Manage your credentials" feature in ...
2
votes
2answers
483 views

Touchpad not detected

Some days ago I received a LDLC Iris FB2-I5-8-S2 notebook and installed Linux on it (Linux Mint 16 Cinnamon 32bit, Kernel 3.11.0-12-generic). Everything except the TouchPad works out of box (even the ...
4
votes
2answers
3k views

Ricoh Aficio SP 100su E

After installing a Ricoh Aficio SP 100su E printer (it does scanning as well), I've tried a tenth of the GDI and PCL (5e/6) generic and Ricoh drivers without any success. I've learned from Ricoh that ...
1
vote
1answer
694 views

How to access u boot environment from linux?

How can I access and change the u-Boot env variables in linux. Using the u-boot/tools/env directory in u boot directory: u-boot$ make env Which created the executable file fw_printenv. I copied ...
2
votes
2answers
720 views

Debian won't boot: udevd fails to load device sda and sdb

I can't boot my Debian system, I got this error during boot up: Driver 'pcspkr' is already registered, aborting. I have solved this by adding blacklist snd-pscp to /etc/modprobe.d/blacklist.conf ...
2
votes
1answer
498 views

redirect web server with no-ip and port forwarding in livebox

I want my Apache web server running on a Livebox (home router appliance running Linux) to be accessible from the Internet (WAN). I installed and configured the application noip2 on my Ubuntu PC. ...
1
vote
1answer
40 views

sysrq-trigger doesn't accept parameter 'g'

I'm trying to debug the kernel. But I couldn't trigger kgdb with echo g > /proc/sysrq-trigger, it just prints help message. I have enabled kernel debugging, kgdb over serial, frame pointer etc. ...
3
votes
0answers
50 views

Why are block sizes limited by page size in Linux?

In many (all?) file systems that Linux uses, including ext2/3/4, the maximum block size is the page size of the architecture Linux is running on, ie. 4KiB on x86. Why is there this limit? Might this ...
0
votes
2answers
53 views

RSA keys demanding nonexistant passphrase [closed]

I need to automate a script that logs into a server. I made an RSA key and upload it to the server's authorized_keys file: desktop$ ssh-keygen -f ~/.ssh/id_rsa_marge -P '' -t rsa desktop$ chmod 600 ...
1
vote
2answers
87 views

How simulate a Windows like admin password prompt in Linux?

I use mint install application a lot but don't think it is safe if I allow the normal user I use to have full privileges over it. I was wondering if there is a way to gain access to this application ...
1
vote
2answers
86 views

Game server hosting and security

I'm working on a small controlpanel for a hobby project of mine, which is supposed to set up game servers. But I have some concerns regarding security that I would like some input on. My first idea ...
11
votes
1answer
156 views

How to make a btrfs snapshot writable?

According to the btrfs Readonly snapshots patch it's possible to "set a snapshot readonly/writable on the fly." So I should be able to turn my readonly snapshot (created with btrfs snapshot -r) ...
1
vote
1answer
364 views

Why do I not seem to have hidraw options on my system, and how can I fix my usb devices?

Starting today, I noticed a few problems with my system. USB devices, including the internal ones such as microphones, don't seem to be working at all. I first noticed when my keyboard and mouse ...
3
votes
1answer
344 views

Verify if a hard drive is encrypted on Linux

How can I verify if a hard drive is encrypted in Fedora 20? If not, does it mean I have to re install Fedora to encrypt it?
8
votes
1answer
626 views

Lightweight virtualization on Linux with user isolation

What Linux-on-Linux virtualization technologies provide user isolation? Specifically, I want root in the virtual machine not to have any privilege on the host. This was not the case for LXC, but was ...
0
votes
3answers
2k views

RHEL:Change Screen Resolution of Virtual Console

I am working on a RHEL 6.3 Workstation. And the monitor is a HD AOC Monitor. Problem I am facing is whenever this machine starts up, it runs with maximum screen resolution. It is a big screen and ...
1
vote
2answers
937 views

Boot Linux from UEFI BIOS

I'm porting UEFI BIOS. I'd like to download an Linux image (bzImage) to system memory by TFTP in my UEFI shell, and then boot the OS directly. I know we generally need another bootloader to do that. ...
0
votes
1answer
325 views

Does sync command remove the dirty cache in the memory?

I am aware that sync command flushes the dirty cache into disk. I have run free command first, then sync, and then free again. The result of latter free command shows more free memory available than ...
-1
votes
1answer
279 views

Unable to connect FTP: 530 Login incorrect

My account has been created on a LINUX server and I am able to login through putty. I have changed my password also. But, to move a file there, I tried to connect that server through FTP client. I ...
-3
votes
0answers
15 views

Mount a drive residing in Windows , on CENTOS 6.3 [closed]

I want to access a particular drive residing on windows, through centos 6.3 running on a VMware. Please mention the steps, to manually mount a drive on centos.
1
vote
2answers
3k views

Movie Player requires additional plugins to decode this file

I'm using RHEL 6 .Newbie to Linux. I'm unable to play the video using Movie Player. It shows an error, Movie Player requires additional plugins to decode this file. The following plugins are required ...
1
vote
1answer
1k views

Bridge interfaces with Vlan on Linux based access point

I have a Linux based wireless access point. It has eth0 interface for ethernet, ath0 for wireless and br-wan as a bridge between the two. bridge name bridge id STP enabled ...
0
votes
1answer
37 views

Create a GPT partition covering the free space

I have 480 GB SSD it currently has the following partitions 256MB EFI partition, 16GB SWAP, and 40GB CentOS 7 see details from lshw below. I want to use the remaining 400GB of unused space on the ...
4
votes
1answer
76 views

How to know what to grep for in dmesg?

I recently had some trouble with a wireless card, and an online forum suggested searching dmesg with grep firmware. That helped, I was able to find the problem immediately! However, the previous hour ...
1
vote
1answer
287 views

Ubuntu - Booting black screen with purple border

After the installation of Ubuntu, when I try to boot a black screen with a purple box appears without let me see the GRUB menu. Then the screen becomes black and Ubuntu starts booting. Ubuntu is the ...
0
votes
1answer
4 views

linux bash prevention flocking for background process

My script makes flock. This prevents me for runing its twice. Script can execute another script, and there is a problem. Sometimes another scripts leaves processes in background. Unfortunately they ...
0
votes
0answers
20 views

How can I use 0.0.0.0/0 in ipset hash:net,port?

Right now, if I do ipset a ansible_allowed 0.0.0.0/0,tcp:22 I get ipset v6.19: The value of the CIDR parameter of the IP address is invalid and instead I have to add 0.0.0.0/1,tcp:22 ...
3
votes
4answers
64 views

Need help understanding line of bash script

I have been reading through the study guides for the LPIC-1. echo "This is a sentence. " !#:* !#:1->text3 I'm having trouble understanding how the above line of code repeats the echo command ...