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
1answer
16 views

how to get list of all processes accessing a shared library

I know that ldd utility can list all libraries linked to a process but I want it the other way around. I want all processes linked to a library. I want to replace a shared library without crashing the ...
1
vote
0answers
23 views

How does the Linux kernel initialize console graphics?

Observation: I switch on a Linux box Boot loader displays its output on screen Boot starts with first output messages Screen goes blank, and never comes back on. Note: this is about the console, ...
0
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0answers
6 views

Xen ERROR Couldn't find xen kernel for Ubuntu tree

xen-4.2 running on server with multiple CentOS running guest, But when i am trying to install Ubuntu i got following error. How do i install Ubuntu on CentOS Xen Server? [root@example ~]# ...
1
vote
0answers
10 views

Replay pcap on local machine only

RHEL 6.5. I have a capture of UDP packets, generated this way: tcpdump -nnXs 0 -i eth1 udp port 26477 and dst 233.86.230.111 -w ITCH.pcap I've moved this file over to a dev VM, and want to replay ...
1
vote
1answer
23 views

How do daemons like apache or bind open ports below 1024?

I know that ports below 1024 are protected and can't be opened by a user without sufficient permission. However, I'm wondering how daemons such as bind or apache can do so, though they aren't running ...
0
votes
3answers
45 views

How to use password in shell scripting

I am writing a script which greps for for multiple files from 3 log files. One of the log file is created as superuser and every time it executes it prompts for password. How do I put it the same ...
0
votes
1answer
23 views

Restore sudo privileges

Trying to install tor-browser, I screwed up my sudo privileges when I tried to take ownership of a directory. Now I get a message: sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit ...
1
vote
0answers
5 views

ufw firewall - how to only “allow” when I am going through a proxy

I am using a proxy to navigate on internet, and I am trying to setup a firewall that will only let me connect to internet via this proxy: if I forgot to turn on the proxy, that I should not be able ...
0
votes
1answer
17 views

Explain ipaddress assignment to the virtual box?

presently my subnet ipaddress starts with 192.168.0.XXX. now my quetion is I am using virtual box in that i installed ubuntu 14.04 can i assign the ipaddress of the node with diffrent ipaddress ...
0
votes
0answers
4 views

Difference between remastersys backup & remastered disk

I am new in Linux OS. I want to take backup of my machine. Now, I am at stage of taking backup but it asks me for below options Option 1] remastersys backup Option 2] remastersys disk I ...
2
votes
1answer
11 views

Mount my mtp in my android phone on a directory?

I have installed mtp-tools on my debian7.8. mtp-files can list all my files on android phone. How can I mount all my files on android phone on the directory /tmp/myphone?
0
votes
0answers
11 views

Fedora 20 boot issues

I've tried installing Fedora 20 (minimal install, machine is old and only has ~1GB RAM), twice now on an old computer meant to act as a home server to SSH into. Both times, I will be able to log in ...
2
votes
0answers
22 views

Trouble calling syscall by name [migrated]

I am in process of adding system calls to linux Kernel 3.19. Tried out the following for adding a syscall 'add' for x86 arch in Ubuntu 14.04 LTS. src=3.19 source Added entry to ...
1
vote
0answers
18 views

Specifically what advantages does Kali Linux have other than preinstalled packages? [on hold]

I have been using Kali Linux increasingly over the last few months. I also have an Ubuntu system, and have found that there are many similar tutorials on how to install Kali tools on Ubuntu. However, ...
0
votes
1answer
18 views

Trying to make a Universal Makefile

I'm working on my own netfilter module for the first time. According to internet documentation, The simplest module contains the following C code: //'Hello World' kernel module, logs call to ...
0
votes
1answer
23 views

After installing Linux Mint, only a terminal is showen when I boot into it

I have been using windows for as far back as I could remember and developing in virtual boxes but I have decided to install Linux Mint onto a second hard drive on my main computer. Sadly, when I boot ...
0
votes
1answer
19 views

cron: output of a script?

I've got a cronjob that looks like this 0 0 * * 7 [ $(date +\%d) -le 07 ] && /home/archiver/archiver.sh &> /home/archiver/output And it works from the cron+bash perspective in that ...
1
vote
1answer
42 views

how to choose appropriate linux hardware - poor graphics performance

I can't believe I am asking this question here myself. Apologies if this is not the right place for this question. I've been using linux since 1996, SuSE version 4.1... And yet I am still not able ...
0
votes
1answer
19 views

Why do we need a usbkbd driver when there is usbhid?

I discovered that it is the usbhid that controls my USB keyboard by default. I discovered it by doing rmmod usbhid. When I removed usbhid the usb keyboard stopped working. Note that usbkbd was not yet ...
0
votes
0answers
7 views

DHCP occasionally assigning IP address with hostapd

I am currently getting my internet from a building of mine two blocks from where I live. I usually use a wireless card to connect to the access point that has the internet..What I am trying to do is ...
0
votes
0answers
11 views

Why I am not able to login on vsftpd server using a basic client program? [on hold]

#include<stdio.h> #include<sys/types.h> #include<sys/socket.h> #include<stdlib.h> #include<arpa/inet.h> #include<unistd.h> #include<string.h> #define PORT 21 ...
0
votes
1answer
20 views

How do I run a service with numactl

I need to do something like this to run MongoDB $numactl --interleave=all /usr/bin/mongod --config /etc/mongod.conf & What should I change to be able to run the mongo daemon with the options ...
1
vote
0answers
17 views

Outgoing masquerade address changes after adding a second interface to the bridge

In fact I have the following configuration: extrouter(192.168.1.1) <- wifi -> [eth2 (192.168.1.11) Centos 6/6 based host br0 (172.22.5.254)] br0 contains two tap interfaces (tap0/172.22.5.1 ...
1
vote
0answers
7 views

can i use lirc using the i/r on my rtl2832U dongle as regular or seperate i/r port?

although this might have rtlsdr tone to it but i am on a hunt for info, tip, tricks & mods related to lirc while trying to get it (or some kind of version) to work on my linux machine. ultimately ...
1
vote
0answers
10 views

how to troubleshoot domain name before re-pointing Nameservers

suppose I have a site: awesomefootball.com hosted on a Linux server with db etc.. For testing, I know how to pull a copy to my MacBook and set up /etc/hosts file to let me test at ...
1
vote
0answers
5 views

KDE5 Digital clock widget show a different time, than the configured

I'm using KDE 5 over Arch Linux, and the digital clock widget show a different time than the configured for kde. The widget can be configured to show a different time changing the timezone for it. But ...
2
votes
1answer
45 views

Test if postfix is running

I'm searching for a reliable way to test if postfix is running from inside a bash script. My first attempt was simply trying pidof postfix, which doesn't work. Then I tried to get the postfix ...
1
vote
0answers
17 views

Libpcap share directory method missing

so im trying to run a c program but everytime i try to run it i get this message error while loading shared libraries: libpcap.so.0.8: cannot open shared object file: No such file or directory ...
0
votes
0answers
11 views

CentOS install spanning 2 or more CDs

I have a custom CentOS install which used to fit on 1 CD. With recent additions, it takes up more space than can fit on 1 CD. Some of our customers have old systems that aren't DVD compatible so we ...
2
votes
0answers
33 views

Two *different* mountpoints having the *same* absolute path (bind-mount problem)

Scenario a NFS share is mounted on /mnt/temp/dir (and other shares are mounted in subdirectories), I umount everything there but supposedly, it doesn't work well (maybe I start with umount ...
0
votes
0answers
13 views

Bad resolution (max 1024x768) ElementaryOS (Ubuntu)

I installed Ubuntu (Elementary OS) a week ago and the resolution was always max 1024x768, but I want 1920x1080. I have searched in the internet for solutions, but I didn't find working ones. I tried ...
1
vote
0answers
22 views

HDD and SDD partition help

I have just got my Thinkpad T420 with an additional mSATA drive and i couldn't be more excited. My current partition layout is: HDD: /boot 256MB, /var 30GB, /opt 50GB SDD: / 15GB, /home/ 50GB, ...
1
vote
1answer
28 views

Calculating RAM/Swap Space Requirements [duplicate]

I have been developing a MySQL database that makes some use of BLObs. This has now been transferred on to a virtual machine (VM) in preparation for going fully into the 'cloud'. However some of the ...
0
votes
1answer
55 views

Did Linux have a bug where reading /dev/null would crash the system?

About 10 years ago I've been told by someone that for years Linux used to crash whenever you tried to read /dev/null (ie. cat /dev/null). Is this actually true? Did such a bug exist? And if it did, ...
0
votes
0answers
18 views

Linux user ssh connection disabled after execution of setfacl command

I have very little linux administration experience, after searching a lot stuff online, finally I decided that I must hope that someone helps. The problem is, I needed to share an account with a ...
0
votes
0answers
11 views

No cursor/caret in Linux VMC under Windows Hyper-V?

I have just installed CentOS-7, Minimal Installation, into a Hyper-V VM under Windows Server 2008 R2. When I Start the VM from Hyper-V Manager it opens a window it calls Virtual Machine Connection, ...
0
votes
0answers
12 views

Plain remote Linux desktop on my VNC Viewer?

So for some reason my VNC Viewer is not showing any desktop icons on the remote Linux. I remember it first happened after I clicked on the button "Quit this session". I am using putty as a terminal ...
1
vote
0answers
27 views

tar --occurrence= option ignored?

Using GNU tar 1.26 on Linux, I'm looking for a way to stop processing after the N-th occurrence of a file in a .tar archive. This should work: tar --file=archive.tar --list --occurrence=1 filename ...
0
votes
1answer
23 views

IPTables Firewall/Router/Gateway needing to block outbound traffic from users

I have multiple ethX interfaces. eth0 is connected to the internet. eth1 is connected to a trusted network. eth2 is connected to a network I need to impose usage rules. What I'd like to do is ...
3
votes
0answers
14 views

Linux, SVN and Dropbox — Which directory should store my svn repository?

I'm trying to set up a linux server for a small team of programmers / artists to use as a svn repository. This repository will be restricted to lan usage but will be backed up online using dropbox. ...
1
vote
0answers
8 views

Can I mount a share and enable the user_xattr mount option?

I have a ext4 drive that is mounted using defaults mount options. It is a RedHat Enterprise Linux version 6.5, 64 bits. I can call lsattr on any file on that server. I need to share that drive with 3 ...
-2
votes
1answer
28 views

What ./configure make and make install does [on hold]

I would like to know exact backgounf taks that happen when you install an application from source What happens when you run ./configure What happens when you run make What happens when you run make ...
1
vote
1answer
13 views

Login using Private key on USB Dongle on SSH@linux

I'm presently using PPK file (public and private key pair) generated from putty to Login (password less) through ssh in Linux server and it is working well. I am exploring possibility in using my ...
3
votes
1answer
20 views

Set SLIP Between xenix and linux

For study purpose i want to set a slip-serial tcp connection between a new linux machine and old xenix machine wich run on VirtualBox. I've setup xenix Virtual Machine with two serial ports: one on ...
1
vote
0answers
36 views

Turn off mirror display on startup on Elementary OS

I'm running Elementary OS Freya Beta 2 with dual displays. I added some xrandr commands to run at startup so the monitor I want is the primary monitor and that the dock starts on the right monitor. ...
3
votes
2answers
28 views

Exchange data between two identical hard drives

I have two identical hard drives (same model) in my system. One is used for data which is not important (could be downloaded again but would take an eternity). The other is my system disk. Now my ...
2
votes
0answers
26 views

How to restore RAID5 Array

I have a RAID5 array consisting of 3 identical 2TB drives. Suddenly GRUB wouldn't boot anymore and gave the error out of disk. Eventually booted a livecd and ran some mdadm commands: mdadm --examine ...
2
votes
1answer
29 views

Mount a windows share without having root credentials

I am trying to mount a Windows shared folder in my home folder. I am able to execute the following command from a Linux (i.e., CentOS) machine which I have sudo access. The command that I am using ...
1
vote
0answers
18 views

process blocked in msgrcv

I have a process that is blocked in msgrcv as shown by ps -eo pid,tid,wchan. Is there any way to find the PID of the process that my process is expecting to receive a message from? The communication ...
0
votes
0answers
24 views

keep getting broken pipe when ssh

I'm using Ubuntu 14 LTS with two machines. When I ssh into the remote machine, I keep getting pipe broken after une minute or two, and in my ssh client I set up the keepalive already. This happens ...