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

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Where can I find the definition of “eth0” in my Ubuntu 14.04 OS?

I cannot find the definition of eth0 in either /etc/network/interfaces or /etc/NetworkManager/NetworkManager.conf, but eth0 works perfectly. So who can tell me in which configuration file I can find ...
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Ubuntu 14.04 LTS on a ASUS Laptop

I have an ASUS laptop which I am trying to re-purpose as a Linux machine, to which I purchased a new 750GB hard drive. Yesterday I installed Ubuntu 14.04 LTS and followed general guidelines for ...
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1answer
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Computer mysteriously seems to power on after surge, but no video or network

I have a box running Linux Mint I've been using as a file/plex host for about half a year to a year. Last night there was a brief power outage and I shut down both of my PCs (linux and Windows ...
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3answers
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iptables catches on DENY but not on ACCEPT place prior to it in the chain

I have a weird problem with my iptables firewall: If I set two consecutive identical rules, the first is ACCEPT and the second is DENY, the incoming packet is denied (and logged as such). How is it ...
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Can't play h264 movies using ffmpeg / vlc / mplayer [closed]

OS: Arch linux, kernel version: 4.0.2 Graphic card: Intel Graphics. I can't play h264 videos using ffmpeg / vlc / mplayer: Here are the logs: ffplay: ffplay version 2.6.2 Copyright (c) 2003-2015 ...
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Skip syslog/rsyslog logging of certain cron jobs [migrated]

In most GNU/Linux distributions the default is to log start (and many different events) of every cron job to syslog. It's rather convenient, but not for a very frequent jobs, which started, say, every ...
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1answer
27 views

How to enter into process running on gdb?

So I was trying to debug a program that runs on two node. I use yod as task launcher. yod -hosts node01,node02 ./dist_task -nl 2 The program is stuck. So I wanted to use the gdb like this yod ...
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1answer
21 views

How to grep through HTML using GNU grep 2.12 and bash 4.2.37?

I've never used grep to parse HTML files, and am having the following problem: grep -Po "(?s)(<h2>.+?<!-- /endcontent -->)" input.html > output.html -bash: !--: event not found I ...
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1answer
42 views

Why should one prefer lower case file extensions like .jpg over uppercase ones like .JPG?

Many (most?) programs note file extensions in lower case. ls command in bash even prints foo.jpg highlighted as picture by default but not *.JPG. Lower case characters are better to distinguish from ...
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How can I compare my backup catalog in VVV app with existing volumes?

I've installed the Linux version of Virutal Volumes View (VVV app) to catalog my 207 DVD and CD backups. (Well, actually, I've just cataloged about 75 so far). I like VVV's simple solution with CLI ...
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1answer
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grep: display all output but highlight search matches

in bash, if I want to execute a command and only display output lines that matches a certain pattern, I can pipe it to grep, like file testfile hello there my friends command $ cat testfile | ...
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Explanation about at0 and eth0?

I know that eth0 is the local network (OR wired network) but what's the at0 and why we can't use iptables (FORWARDING) on it or in other term what's the difference exactly between them (what's the ...
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Can login in to Gmail and Chrome, but can not access accounts.google.com

I visit the Internet through a VPN, my DNS has been set up as 8.8.8.8. I can ping through domain names include accounts.google.com and 1.client-channel.google.com, they all works. So far as I know, ...
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1answer
28 views

How to disable a plugged-in PCI-e graphic card on OS level? [duplicate]

I have a server running for which I want to have a possility to access it with a screen connected to VGA (very rarely, most of the time it's accessed via SSH). Therefore I have a PCI-e graphic cards ...
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3answers
93 views

How can I have very large files/directories copied from one host to another “offline”?

I intend getting a vps server real soon for some of the resource-intensive sites I manage. I live in a country where 1Mb/s internet speed is a luxury and constant uninterrupted electricity, a myth. ...
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0answers
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equivalent of iptables rule in ip6tables

I m newbie in the iptables. I have the following iptables rules in the source code of a project iptables -t mangle -I PREROUTING ! -i br0 -p TCP --dport 45 -j MARK --set-mark 0x1000 iptables -t nat ...
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2answers
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iptables directing traffic through vpn

Networking newbie. I have two interfaces on the host: eth0 and tun0 from my OpenVPN client. The IP addresses are: eth0 192.168.1.22 tun0 10.1.0.8 Question 1 For outgoing traffic by changing ...
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Exchange Server 2013 with Linux domain controller

Consider the scenario: in DMZ LAN, a company is willing to replace Zimbra mail server (running in Linux server) with Exchange Server (running in Windows server) in LAN, employees use Windows in ...
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1answer
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what the “!” means in the iptable rule

what the "!" means in the following iptable rule iptables -I inacc ! -i br0 -p UDP --dport 69 -j ACCEPT I think is related to the interface br0. I think it mean any interface except the br0 Am I ...
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3answers
37 views

How to create a group, add user to group, and give that group full access to directory in linux

I have my local user localUser who has directory /home/localUser. There is another user serviceUser who runs some services and he needs full access to some folders in my home directory. I want to ...
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1answer
50 views

Fastest remote desktop alternative to RDP on Linux [closed]

What is the fastest available alternative today for remote desktop connection on Linux? I've tried following but all seems slow compared to Windows RDP: X11 forwarding (even with compression and ...
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1answer
33 views

Purpose of each disk access and why it may not occur [on hold]

I'm going over past papers for an exam I have and my university do not provide answers so that I can check them, please could you let me know if my understanding is correct and if not please could you ...
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Ms office 2010 not working in fedora 22 in wine

i am new in Linux, Using fedora 22 beta. i have installed wine. Then installed ms office standard 2010 package. Everything was okay except the Ms power point.Then thought as we do in windows, i will ...
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1answer
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What does “warning: nm: no name list” mean?

I'm trying to grep for a symbol in a library. $ nm /usr/local/ssl/macosx-x64/lib/libcrypto.a | grep rc4_md5_enc warning: nm: no name list warning: nm: no name list warning: nm: no name list ... The ...
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1answer
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Why did the naming convention of network interfaces change in linux?

I recall not too long ago, interfaces were identified by eth0, eth1, wlan0, etc. Now I'm finding interface names like enp0s3, enp0s8, etc. In another question I asked here only moments ago, someone ...
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2answers
25 views

Database backup bash working via ssh but not in cronjob

I've put together a script to backup my database on a shared host. The script is as follows: mysqldump --databases [db1] [db2] | openssl aes-256-cbc -a -salt -pass ...
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2answers
38 views

In Virtual Box, how do you know which NIC is which from the linux command line?

I've run into a problem a few times now where I'm installing linux in a virtual machine, and all of my interfaces look like "enp0s3" or "enp0s8" ect. In one test, I was running a VM with 4 virtual ...
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1answer
10 views

Problems with function checking if a path exists or not

I am a little new to bash scripting and I was trying to make this program capture a directory path from user and then check if the directory is present. It seems as if the variable SRC inside the ...
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1answer
19 views

Cat and/or echo several things into one file on “one command line”

I know we can do things like this: stat -f%z mybigfile > RELEASENOTES.txt and echo "bytes" >> RELEASENOTES.txt Now RELEASENOTES.txt will look like this: 47556304 bytes How can I get ...
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0answers
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Sharing HFS+ (USB-HDD) over NFS

I've hooked up an external HDD to my Raspberry Pi running Raspbian. It shows up under /dev/sda2 and /dev/sda3 (two partitions). I followed numerous tutorials, but none seem to have a fix for my ...
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1answer
24 views

How to show path in shell, but only a fixed number from pwd?

Basically, I want to display something like: me@host.serv.com:../projects/1234/source$ cd cpp me@host.serv.com:../1234/source/cpp$ instead of: ...
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1answer
14 views

Remove PostgreSQL database files

I've uninstalled PostgreSQL some time ago, but now I needed it again, and installed it. When running rcpostgresql I get the following: /usr/sbin/rcpostgresql Your database files were created by ...
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0answers
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Linux interrupt handling : bottom half

In Linux, the handling of interrupt handler is divided into two components : top half, and bottom half. From my understanding, the bottom-half of an interrupt handler can be handled in many ways : ...
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1answer
39 views

Kali Linux gives me an error message when i try to use setup

When i try to setup Kali Linux i get an error message saying it cant find win32-loader.ini. I have also tried just booting it but a CMD window pops-up for a blink of an eye not nearly enough time to ...
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1answer
18 views

file owner doesn't belong to file group

hopefully quick question regarding web server write and read permissions. Here's the thing. Currently I have this setup on a production server: ... drwxr-xr-x 12 apache developers 4096 Apr 27 ...
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1answer
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How can I disable KDE Alt-` behaviour

After upgrading my Linux Slackware, KDE started to respond to a new key shortcut, which did not happen before. When I click Alt-`, I see the icon of the current window with it's title in the center ...
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1answer
23 views

Changing ownership not permitted

Probably answered many times, but I connot find the solution of my case. I'm compiling a Yocto project with bitbake. A recipe of bitbake try to change the permission of some dir and files using ...
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1answer
16 views

Make a group be able to run shutdown command without entering a password (CentOS)

I used the command visudo -f /etc/sudoers to edit the sudoers file. How do I make a group be able to run the shutdown command without supplying password?
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2answers
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SSH Connection is established on port 22, but service is not working

I am having this recurrent issue on one of my MySQL Cluster Servers, actually always happens in any random MySQL server of this cluster, on many countries where we have this same configuration. I ...
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1answer
23 views

iptables problem in Evil Twin

I've been looking into the Evil Twin method and I found this steps: Creating AP airmon-ng start wlan0 airbase-ng -e PrivateWIFI -c 9 -v mon0 at0 Configuration ifconfig at0 up ifconfig at0 ...
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1answer
15 views

inotify script stops after first change

Inspired by this superuser answer I have written the following copy_library.sh script, saved in the same folder as a file called library.bib: #!/bin/sh while inotifywait -e close_write library.bib; ...
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1answer
84 views

Terminal error messages are not in English [duplicate]

I have Ubuntu 15.04 installed on my machine. Currently terminal error messages are not in English (actually they are in Russian). For example, $ mmmm mmmm: команда не найдена I want to see $ ...
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Why would I choose mkcramfs over mkfs.cramfs, or is there even a difference?

From what I've seen it looks to me like mkcramfs from cramfsprogs is thought to become a successor of mkfs.cramfs from util-linux — is that correct? If that's true, why is that so? What exactly is ...
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Anonymous root access via ftp

I have inherited a part of a project where the rootfs of a Linux system must be accessible over anonymous ftp with read/write access. I have been trying to set this up using vsftpd on Ubuntu server ...
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netstat -o timer value “probe”

A bit of background on the scenario. I have a distributed application running on RH6.5 that uses JMS (OpenMQ 4.5.2) to send messages between hosts. One host (Host A) receives information from network ...
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1answer
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Partition size from “df -h ” vs “fdsisk -l”

Partition size using "df-h" Filesystem Size Used Avail Use% Mounted on /dev/sda5 19G 17G 516M 98% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev ...
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I can't press right click and icons disappeared on RHEL6

I'm only left with the desktop. When I right click, I get no response. Another problem is that there's no menus or icons. When I try to open Nautilus it doesn't start. When I tried to open it from ...
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3answers
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Can I change my PATH dynamically based on my cwd?

I would like to change my $PATH environment variable dependent on my current working directory. Say I'm in /foo/bar/baz and I have the directories /foo/node_modules/.bin and ...
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1answer
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Debugging ExtFS on OSX - works for 3 days then nothing?

I installed the trial of ExtFS 9.7.109 on OS X 10.10.3. It worked great for the first 3 days. But now my ext4 drives no longer show up. Last thing that worked was copying data from an ext4 drive. ...
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1answer
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Connect a external SSH Server from blocked SSH Tunnel network

I need connect to SSH Server in my work office from a academic network, but in all tries occurred a "Timeout error". In my home and in other places the access work fine to connect (SSH Server working ...