19
votes
2answers
839 views

What does “magic tests” mean for the file command?

I was reading about the file command and I came across something I don't quite understand: file is designed to determine the kind of file being queried.... file accomplishes this by performing ...
4
votes
0answers
197 views

Takeover delay in Heartbeat HA cluster

I have set up a heartbeat HA two node cluster. And both of server have same configuration of ha.cf #cat /etc/ha.cf logfile /var/log/ha-log autojoin none bcast eth1 warntime 20ms deadtime 40ms ...
3
votes
1answer
1k views

Open a specific application in a *new* workspace with i3wm

My question is something like this - but I don't want to open a given application on a specific workspace, I want each instance to open on a new workspace each time. The OP in the linked-to ...
3
votes
1answer
6k views

How to change the default version of Python in Debian 7.5?

I'm using Debian 7.5, and I've installed Python 3.3 and 3.2. How do I make 3.3 the default for when someone types python in the command line?
0
votes
1answer
426 views

Raspberry pi running owncloud not reachable using no-ip URL

I have a problem reaching my raspberry pi from outside of my LAN and I don't remember having changed anything. It was working previously, but I don't know what changed. I've installed owncloud with ...
0
votes
2answers
12k views

Passing a variable to a bash script that uses 'EOF' and considers the variable a literal [closed]

in this script i end up with "$1" being saved to the /test file. #!/bin/bash cat > /test << 'EOF' $1 EOF the truth is.. i need to keep 'EOF' as 'EOF' because my argument($1) contains ...
10
votes
2answers
6k views

SSH & ForwardX11 vs ForwardX11Trusted --> beyond my grasp

I am on Ubuntu 14.04 and trying to get my head around ForwardX11 vs ForwardX11Trusted. My default ssh_config contains the following lines: # ForwardX11 no # ForwardX11Trusted yes Further, man ...
1
vote
1answer
344 views

How to Upgrade Oracle VirtualBox 4.1.12 to to 4.2.10

I installed Oracle VirtualBox 4.1.12 in my Ubuntu 12.04. Now I want upgrade from 4.1.12 to 4.2.10 version. How can I upgrade the Oracle VirtualBox in command line
0
votes
1answer
667 views

Bash Script : Passing a variable to a bash script that contains quotes, single quotes. etc [closed]

lets assume this is the string: 'a',"b" it contains both single and double quotes. how would you pass this to a bash script as a single string ? this is the bash script: #!/bin/bash echo $1 ...
2
votes
2answers
2k views

“cat” command: how to automatically escape everything that might be a violation?

If you copy the contents of httpd.conf and then paste it into a cat command.. such as this one.. #!/bin/bash cat > /test << EOF pasted here.. EOF you run into this error: -bash: ...
7
votes
4answers
31k views

How to get lines 10 to 100 from a 200 line file into a new file [duplicate]

I have file with 200 lines. I need to extract lines from 10 to 100 and put them into a new file. How do you do this in unix/Linux? What are the possible commands you could use?
6
votes
1answer
19k views

Is no caching mode page a serious error?

My server log displays the following error messages in RED: kernel: sda: sda1 sda2 kernel: sd 0:1:0:0: [sda] No Caching mode page found kernel: sd 0:1:0:0: [sda] Assuming drive cache: write through ...
3
votes
1answer
647 views

How to make a PAM substack “requisite”?

For the auth section of my PAM configuration, login and mdm etc. call common-auth. I have common-auth calling the following as a substack (as auth substack krb5ldap-cache-auth): auth optional ...
1
vote
1answer
439 views

Why All the text is invisible in Intellij? [duplicate]

I have installed manjaro and intellij. For a couple of month now I had no problems at all and I was fine with that. Since yesterday I experience a strange bug. The whole text is gone. What I tried ...
1
vote
2answers
2k views

Extract Values from simple html file via grep/awk

I have another grep/awk/sed issue within the attached HTML code below. Given is a simple HTML file with table inside. The HTML is generated by a smart meter (household energy meter). Inside the html ...
2
votes
1answer
74 views

Automatized kernel upgrade

I am writing a BASH script that automatically configures, builds and installs the most recent kernel image. The generated kernel should include the grsecurity patchset. It would use the previous ...
1
vote
3answers
2k views

How to install Touchégg on Fedora 20

How do I install Touchégg on Fedora 20? https://code.google.com/p/touchegg/wiki/CompileSourceCode seems to be written for Ubuntu (Debian) systems, which makes me confused; 1 - Download and unzip ...
1
vote
0answers
227 views

How do I control ip routing in the new firewalld?

I have the following scenario: Our fedora server is connected to the internet on eth0 and has a second nic, wlan0 acting as an access point. The purpose of the access point is to provide a connection ...
2
votes
1answer
123 views

How to discard/TRIM a range in an open file ?

For an SSD, I can open the row device and discard a range of pages using ioctl() with BLKDISCARD command. My question is for an open file, how to discard a range of data? and Is that depends on the ...
1
vote
2answers
982 views

Unable to install Linux Mint 17 on hardware that uses AMD APU (A5800k) with MSI motherboard

I and many other users of Linux Mint are not able to install Mint 17 on hardware that uses AMD APU (A5800k) with MSI mobo. I understand that the issue has been noted but I cannot find a fix to this ...
3
votes
2answers
613 views

change url of web browser thru command line?

Is there some way to change the current url (of current tab or an specific tab) of a running web browser (any) thru command line? It can be any browser that run on linux, preferably if it is light ...
2
votes
0answers
1k views

Unable to mount XFS volume after reboot - unknown filesystem type 'xfs'

I have an aws ec2 instance that's been running Ubuntu 12.04 for a good long while. It has attached to it an EBS volume formatted with xfs. Today after a reboot, I'm unable to mount this volume. ...
7
votes
1answer
6k views

How can I forward sound over VNC?

I use TightVNC and Remmina Remote Desktop to connect my Raspberry Pi to my Ubuntu laptop over VNC. It works great for the most part, except for the fact that there is no sound. I have googled all ...
7
votes
6answers
2k views

Split large file into chunks without splitting entry

I have a rather large .msg file formatted in the UIEE format. $ wc -l big_db.msg 8726593 big_db.msg Essentially, the file is made up of entries of various length that look something like this: UR|...
6
votes
1answer
39k views

How to read/write to tty* device?

I have a device that sends information over USB to my computer. Arch Linux sets up this device by creating a file named ttyUSB0 in /dev/. I have been using GTKterm to receive this incoming information ...
1
vote
0answers
288 views

Fedora 20. Authentication requires a different password from su

In Fedora 20 (using Mate desktop) I have tried to change the default keyboard layout from US English to UK English, but am asked for "Authentication". The password I have for su is not accepted, and I ...
2
votes
1answer
97 views

How do I find the NetBSD release for CentOS 6.5?

I want to find the NetBSD rump package used for CentOS 6.5. The list is present here. I want to get the rump package for CentOS and after searching, I found this version of netbsd-rump used in ...
2
votes
2answers
583 views

“tcpdump” to capture the last packets

I am monitoring a certain port, because my application uses that port, it seems that the connection drops at random times, I want to see what are the last packets passing through before the connection ...
1
vote
1answer
195 views

Backup LUKS (cryptsetup Command) partition or volume

Can you create a file container/volume in LUKS in the same way that you could do with Truecrypt? Otherwise, how can you backup a LUKS partition? Do you have to clone it, for example with dd? or backup ...
3
votes
1answer
3k views

VNC on elementary os

I installed elementary OS on my laptop and tried to install VNC server. First I installed vnc4server, opened and logged from phone. On screen I saw: failed to load session gnome How do I need to ...
6
votes
1answer
258 views

mutt: how to display selected new messages differently in index

I have my own colors defined for mutt. When I start mutt, the cursor (i.e., indicator) is on the first message (i.e., the first message on the top is selected). I have defined colors for the selected ...
4
votes
6answers
9k views

How to tell “cat” command to not hang on when there is no path provided?

I am simply trying to get a bash script to return the content of a text file. #!/bin/bash cat $1 the problem is.. when the path to a file is not fed to this bash script... how will it even close ...
2
votes
2answers
17k views

How do I sort using the grep and sort commands?

I would like to create a sorted list of all TCP services found in the file /etc/services, pipe the output of the command grep tcp /etc/services into the command sort, then redirect the output of this ...
2
votes
2answers
168 views

Is it necessary to disown a process for it to continue running after disconnecting?

Would someone be kind enough to explain if & why disown is necessary if you wish to keep a job running even after you disconnect. I ask because every site I have visited says to use disown and bg ...
2
votes
2answers
99 views

How to prevent massive file delete on Debian

Today I noticed that I lost approximately 1 TB of very old movies in my collection. I have no idea how it happened, but Munin shows what happened. I'm pretty sure it was my fault. (I was awake at that ...
0
votes
1answer
111 views

Cross Compiling - Platform Vs Architecture

Could someone explain, what is the precise definition of cross compilation. I am asking this because. When a program is compiled to a different platform (operating system) other than the host ...
1
vote
1answer
780 views

kernel source code for beaglebone black

I want to build an Ubuntu kernel from scratch for beaglebone black. I have been searching for where I can download the kernel source code for more than two days but haven't found anything. So, ...
0
votes
2answers
142 views

Write log for a false statement of an if condition which returns exit 2

I have a script running every 5 mins with two exits in a condition clause. #!/bin/bash date=$(date +%Y) if [ $date -eq '2014' ] then echo "Current year is $date" exit 0 else echo "Current ...
0
votes
1answer
55 views

script to zip a file and change its owenrship

I have a script I am working on that reads off of a text file and will use the information stored in the text file to put each line entered in as an array. This array is a reference to files that are ...
6
votes
1answer
1k views

Multiseat X setup with a single dual head graphics card

I am considering trying to setup a multiseat system. It seems like this would be pretty straight forward if I had two graphics cards or if I didn't need hardware based OpenGL acceleration. Is it ...
1
vote
2answers
269 views

alias for a command using !! to recall the last command [duplicate]

This is a follow-up question to Execute a line of commands with one sudo If you want to redo the same command with sudo !! after doing a command like this: echo "something">/path/file You ...
2
votes
3answers
222 views

grep for all the lines that doest not have a particular word

I have a file fileA.txt Batman.plist Green Arrow.plist Hawkgirl.plist EOPrototypes.plist Person.plist EOPrototypes.plist EOJavellinPrototypes.plist Sinestro Slomon Grundy.plist Batman Beyond.plist ...
-1
votes
1answer
85 views

How turn external HD visible in Virtualbox Debian VM?

I want to clone my Virtualbox VM to a another/external HD in my computer. My VM is a Debian 7, and I want to use the dd command on an external HD. Is this possible? When I use # fdisk -l only ...
0
votes
1answer
692 views

How to start the Snort service with logging enabled?

I setup snort on Centos server and add as a service. When I use service snortd start command, the log file is created but it is empty. If I use snort -q -l /var/log/snort command, the log file created ...
5
votes
4answers
12k views

Arch Linux run script a minute after boot

I have set up a bridge between eth0 and wlan0 with netctl. It works fine if I tell it to configure eth0 and wlan0 at startup and then for me to manually start the bridge after it boots. If I tell the ...
1
vote
1answer
780 views

How to make vnc server and ldap authentication work together?

I have a RHEL 6.4 box and I am running tigervnc-server on the box to enable remote gui access for different users. I have the users created locally and have created separate displays for them in the /...
15
votes
3answers
15k views

Execute a line of commands with one sudo

For example if I want to create a file and enter text in one line I can redirect the output into a file with the use of the > operator: echo "something" > /path/foobar but if I don't have ...
1
vote
1answer
1k views

Attachment missing in Unix mail when multiple files were attached

I am trying to attach multiple files in Unix, which are the result of a find command. When I try to send the mail, the attachments are missing. dir=$path echo "Entered into $spr/sum_master" for fil ...
2
votes
0answers
178 views

kernel build: why does 'make install' complain about missing modules?

I'm building a 3.2.x kernel on a RedHat Enterpise system. During 'make install' it takes a very long time and is complaining : ERROR: modinfo: could not find module xxx I assume its probing ...
-1
votes
0answers
25 views

replace $ with £ using sed command [duplicate]

I have text file DollarToPound.txt with some Dollar signs ($) please provide a shell script to replace dollar symbol with Pound(£) with sed command. iam getting command garbled error!!! please help. ...

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