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• Bash script to open, read, and write then save....

  - by Alex Vo

  I'm new on this bash script thing. Can you show me some example on writing Bash script. I want to write a script that can read from a filename and save it to a variable; increment the value of the variable and write that variable back to the file and save it. This is what I have started and stuck on it so far. #!/bin/bash # if file exist #echo "Testing \ "$1"" if [ -f "$1" ]; then echo "$1 does exist" else echo "$1 does not exist!" echo "Creating $1" touch $1 echo "This is test" > $1 exit 1 fi #echo "Testing \ "$2"" if [ "$2" == "" ]; then echo "Enter the filename" elif [ -f "$2" ]; then echo "$2 Fille does exist" else echo "$2 File doesn't exist" echo "Creating $2" touch $2 exit 1 fi counter=1 echo -n "Enter a file name : " read file if [ ! -f $file ] then echo "$file not a file!" exit 1 fi

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• How to mount a iSCSI/SAN storage drive to a stable device name (one that can't change on re-connect)?

  - by jcalfee314

  We need stable device paths for our Twinstrata SAN drives. Many guides for setting up iSCSI connectors simply say to use a device path like /dev/sda or /dev/sdb. This is far from correct, I doubt that any setup exists that would be happy to have its device name suddenly change (from /dev/sda to /dev/sdb for example). The fix I found was to install multipath and start a multipathd on boot which then provides a stable mapping between the storage's WWID to a device path like this /dev/mapper/firebird_database. This is a method described in the CentOS/RedHat here: http://www.centos.org/docs/5/html/5.1/DM_Multipath/setup_procedure.html. This seems a little complicated though. We noticed that it is common to see UUIDs appear in fstab on new installs. So, the question is, why do we need an external program (multipathd) running to provide a stable device mount? Should there be a way to provide the WWID directly in /etc/fstab?

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• SSD Performance for PHP?

  - by Andrew Fashion

  My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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• Is anyone working on an encfs client for windows?

  - by snth

  I've been looking into encfs as a solution to encrypt my personal data. However I want to access this data both on Linux and Windows on different machines (synced through Dropbox). So far all Google searches have brought up pages which specify that there is no Windows client that reads encfs. Therefore my question is: is anyone working on a Windows client for encfs? It would be really useful if someone was and it seems to be a common enough issue raised that I have a glimmer of hope that someone might be working on it.

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• Desktop file for my pythin script

  - by Jason94

  Hi! I would like to make a .desktop file for my Python script, but so far the only thing i have is a clickable icon on my desktop! It does nothing when i click it, so im guessing there is something wrong with the execution :) The desktop file: [Desktop Entry] Version=1.0 Type=Python Exec=/home/user/MyDocs/Python/EasySteer/Main.py Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons and I also tried: [Desktop Entry] Version=1.0 Type=Application Exec=/usr/bin/xterm "python /home/user/MyDocs/Python/EasySteer/Main.py" Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons But nothing works :D if it matters this is for my Nokia N900 mobile phone that runs Maemo linux, but i think the basics are the same.

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• Tar and gzip together, but the other way round?

  - by Boldewyn

  Gzipping a tar file as whole is drop dead easy and even implemented as option inside tar. So far, so good. However, from an archiver's point of view, it would be better to tar the gzipped single files. (The rationale behind it is, that data loss is minified, if there is a single corrupt gzipped file, than if your whole tarball is corrupted due to gzip or copy errors.) Has anyone experience with this? Are there drawbacks? Are there more solid/tested solutions for this than find folder -exec gzip '{}' \; tar cf folder.tar folder

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• EC2 custom topology

  - by Methos

  Is there any way to create a desired topology of EC2 instances? For example, can I create a 3 node topology of nodes A, B, C where C gets the public IP address and B and A are connected to it. Something like: Internet <-- C <-- B <-- A B and A only get private IP addresses and there is no way for the traffic to reach A before hitting B and C. This means I can install whatever I want to install on C and B to filter, cache etc. I'm going through EC2 documentation but so far I have not seen anything that talks about it. I will really appreciate if anyone knows how to do this on EC2

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• Bayesian content filter for vbulletin [on hold]

  - by mc0e

  I've been tasked with coming up with a tool to automatically flag some posts for moderator attention on a large vbulletin forum. It's not spam per se, but the task has a lot in common with the sort of handling that might be done by a spam protection plugin (a mod in vbulletin speak). There's only so much I can say, but the task does not involve bad users, so much as particular kinds of posts which the moderators need to be aware of. Filtering out user registrations and links is therefore not useful, and we are talking about posts by real human users. What I'm looking for is an existing bayesian classification plugin, or something that I can study to get an understanding of how to do the vbulletin side of the interface in order to build such a thing. Ie I'd need ways for moderators to list flagged posts, and to correct the classification of posts which have been mis-classified. Ideally I want a 3 way split with an "unsure" category in order to reduce what has to be reviewed to find any mis-classifications. Any pointers? I've searched around a bit, and so far what I've found has been more or less entirely targetted at intervening in sign-ups (mostly using stopforumspam), captchas, and use of external services like akismet which are spam specific. I'm also considering an external solution, which might be ableto be interfaced i

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• ubuntu 12.04 installer does not recognize drive partitions

  - by endless forms

  I recently purchased a new HP Pavilion HPE desktop running Windows 7. I am trying to install a dual-boot system with 12.04. However, when I run the LiveCD I only get as far as the "Install" window where you can select the partitions for your drives. On the bottom where it says "device for boot loader installation" I have "/dev/sda" and cannot select any other devices. All the options to change the drives are greyed out, most likely because there are no drives in the window. I partitioned my largest drive using the tools within Windows, then booted into the CD, but nothing shows up. I then used Gparted to change the new space from unallocated to an /ext2, and still nothing shows up. The installer does not recognize anything, but when I go into an Ubuntu session and use the disk utility manager I can see the partitions I made. Anything I do has to be done outside of the installer. I have no files on this new computer, so this is the perfect time to install a parallel OS. I would like avoid completely reinstalling Windows, however. I've been over the forums many times, but all the answers I've found have not worked for me. I also tried flagging the new, empty partition as boot, but that screwed Windows up. Also, the WUBI installer hits the same point and quits. I know that the disk itself is fine because I just made another dual boot system on a Gateway PC. This makes me think something within this computer is preventing the installer from "seeing" the drives. Any help would be much appreciated! Edit in response: The main part of the partitioning window shows no partitions, everything is blank. There is no way to add partitions, and all the buttons are useless. I've tried defragging my drive multiple times, and I also used the same disk to dual-boot another PC with no problems, so it's not the disk, it's definitely the computer.

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• Documents stored on separate internal drive, Ubuntu doesn't notice on startup

  - by PlanoAlto

  My machine has Windows 7 Ultimate x64 and Ubuntu 12.04 LTS running side-by-side on a single hard drive with GRUB bootloader, each with 500 GB storage. I keep my personal documents on a separate 1TB hard drive so they remain isolated from any changes I make to the OS drive, but when Ubuntu starts it does not seem to notice my documents drive. While I've installed and worked with Ubuntu 12.04 Server x32 before, using it as a desktop OS is new to me. I use my documents drive for all of my personal data, including wallpapers and music, so it is imperative that Ubuntu recognize it on startup. Concerning the two specific examples: Ubuntu loads with the default blue-colored desktop instead of my desired picture of the spectacular Carina galaxy. When I right-click the desktop and select "Change Desktop Background", it wakes up from its amnesia and loads the proper background. As for my music, Rhythmbox defaults to an empty library upon reboot, forcing me to reload the settings manually each time. This gets quite tedious because I certainly can't work to my full potential without my music. The second thing I would like to address is making Ubuntu point the documents directories in ~ to their appropriate counterparts on the 1TB documents drive. I realize that this question is not new, but when I create the symbolical links, they established themselves inside the directories and did not convert the directories themselves into symbolical links. I also prefer not to move the files themselves from their current location on the 1TB drive. I believe this would also help the Rhythmbox library problem as well considering it's a default directory for the music player. Excerpt from fstab: proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sdb6 during installation UUID=057ac83e-76ad-460d-86e5-b6d46e9b1d80 / ext4 errors=remount-ro 0 1 # swap was on /dev/sdb7 during installation #UUID=1183df90-23fc-44e4-aa17-4e7c9865d5cb none swap sw 0 0 /dev/mapper/cryptswap1 none swap sw 0 0 That's enough content for one question. I really like the Ubuntu experience so far since it doesn't treat me like an idiot out of the box (can't say the same for Windows) so I can't wait to hear from the community! Thanks for your help in advance.

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• Ubuntu install can't find hard drives

  - by Casey Hungler

  I recently got a Dell Inspiron Special Edition 7720 computer. I am trying to install Ubuntu along side Windows. When I use the WUBI installer, the installation of Ubuntu works as long as I do not boot into Windows; if I boot into Windows, when I go back into Ubuntu, I am given a variety of error messages which claim to have corrupt or missing kernel/root directory, etc. I have been working with this problem for about a week, and have reinstalled Ubuntu MANY times. So far, I have eliminated all of the following problems: Corrupt WUBI installation (Downloaded multiple times, used on other systems), I have tried using a CD and a flash drive, both of which work on other computers. I know that no program within Ubuntu is creating the problem. I know that others have successfully installed Ubuntu on a computer with my operating system (Windows 7 SP1). This is a much shortened version of the original question, which has been up for about 5 days, and included a more detailed description of the problem, but left everyone clueless as to the source of this problem. When I spoke with the Dell service technician who came over today to replace my keyboard, he suggested that the driver for my HDD was so new that it was not compatible with the current version of Ubuntu. His reasoning is as follows: 1) During an install from a flash drive or CD, where I am supposed to get the option to wipe my system or create a dual boot, I get a window that asks me to select a hard drive partition, but none are listed. 2) This model of computer was made public in June of this year, while Ubuntu was released in April Adopting this theory, it would seem to me that the WUBI install fails after booting into Windows because Ubuntu can no longer find the files that it needs to load. Does this theory seem at all plausible to anyone? I just want to install Ubuntu and have it stay on my computer. I don't care how I put it there, I just need it to work, so I would TRULY appreciate any advice or suggestions anyone could give. Thanks so much for your time and support!!!

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• Input prediction and server re-simultaion

  - by Lope

  I have read plenty of articles about multiplayer principles and I have basic client-server system set up. There is however one thing I am not clear on. When player enters input, it is sent to the server and steps back in time to check if what should have happened at the time of that input and it resimulates the world again. So far everything's clear. All articles took shooting as an example, because it is easy to explain and it is pretty straightforward, but I believe movement is more complicated. Imagine following situation: 2 players move towards each other. A------<------B Player A stops halfway towards the collision point, but there is lag spike so the command does not arrive on the server for a second or so. Current state of the world on the server (and on the other clients as well) at the time when input arrives is this: [1]: -------AB------- The command arrives and we go back in time and re-simulate the world, the result is this: [2]: ---AB----------- Player A sees situation [2] which is correct, but the player is suddenly teleported from the position in [1] (center) to the position in [2]. Is this how this is supposed to work? Point of the client prediction is to give lagged player feeling that everything is smooth, not to ruin experience for other players. Alternative is to discard timestamp on the player's input and handle it when it arrives on the server without going back in time. This, however, creates even more severe problems for lagged player (even if he is lagging just a bit)

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• EXT4 external hard drive for use with multiple systems

  - by EXTdumb

  I recently bought a external hard drive to store some data on. I use Linux but I am not a power user. If I format the drive to EXT4, is it possible for the permissions to ever screw up and I lost access to my data? I will be plugging the drive into several different linux based computers at work and I frequently hop distros on my main home machine. I need to make sure I don't lose any data because I overlooked something. I am not familiar with EXT 3 or 4. So far I have done this : Formatted drive to EXT4 ran gksudo thunar and changed the permissions to my user account and all settings to read/write Wrote all the files I need to the drive I really appreciate any help.

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• mod_rewrite, 301 problem

  - by blid

  Hi, Currently I can access specific site in two ways: 1. http://a.com/foo/bar 2. http://a.com/index.php?url=foo/bar What I'm trying to achive is to allow to do it only using first way, and make redirect 301 on the second to the first one. Here's the code which I made so far and put into .htaccess: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] #tricky part RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\?url=?(.*)\ HTTP/ RewriteRule ^index\.php$ http://a.com/$1 [R=301,L] </IfModule> Currently it do almost all the job, it's redirecting index.php to /, but index.php?url=foo/bar to /?url=foo/bar and I can't manage to make it right. TIA.

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• How do you tell if advice from a senior developer is bad?

  - by learnjourney

  Recently, I started my first job as a junior developer and I have a more senior developer in charge of mentoring me in this small company. However, there are several times when he would give me advice on things that I just couldn't agree with (it goes against what I learned in several good books on the topic written by the experts, questions I asked on some Q&A sites also agree with me) and given our busy schedule, we probably have no time for long debates. So far, I have been trying to avoid the issue by listening to him, raising a counterpoint based on what I've learned as current good practices. He raises his original point again (most of the time he will say best practice, more maintainable but just didn't go further), I take a note (since he didn't raise a new point to counter my counterpoint), think about it and research at home, but don't make any changes (I'm still not convinced). But recently, he approached me yet again, saw my code and asked me why haven't I changed it to his suggestion. This is the 3rd time in 2--3 weeks. As a junior developer, I know that I should respect him, but at the same time I just can't agree with some of his advice. Yet I'm being pressured to make changes that I think will make the project worse. Of course as an inexperienced developer, I could be wrong and his way might be better, it may be 1 of those exception cases. My question is: what can I do to better judge if a senior developer's advice is good, bad or maybe it's (good but outdated in today context)? And if it is bad/outdated, what tactics can I use to not implement it his way despite his 'pressures' while maintaining the fact that I respect him as a senior?

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• Remotely start VNC server on computer with no Admin password

  - by Joe M.

  I'm trying to remotely access a particular computer of mine and it seems that VNC has stopped. I can tell that the computer is still running because I can VNC into another machine on the same network and can see my target machine under the Network section in Windows Explorer and can also ping it succesfully. To summarize: I own the target computer I am currently too far to physically access it Remote Desktop Connection feature of Windows is not enabled The computer normally runs a VNC server, but it seems to have stopped The computer is definitely on and connected to the network The computer has no password on the Admin account I can VNC into other computers on the same LAN Given these conditions how can I get into the target to open VNC server, or even just reboot the target (VNC should open on startup)? I have tried PsExec and get "access is denied", and also tried "Connect to another computer.." from the Computer Management console and also get "access is denied".

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• How to use a D-Link usb network adapter on debian

  - by Barranka

  I have a Debian (squeeze) desktop, and I need to use a D-Link 150 USB Wireless Network Adapter. So far I've done this: $ lsusb ... Bus 001 Device 006: ID 2001:3c18 D-Link Corp. ... After looking for a solution in google, I found that I needed to install the following package: firmware-ralink_0.28+squeeze1_all.deb I've installed it, but Debian doesn't want to find the adapter. When I run lsmod, I can't find what I'm supposed to find: rt2870sta Can you point me in the right direction?

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• Permission denied on network share

  - by Philipp

  i have a Windows 8 host system running a virtual(hyper-v) Debian6 client with an lamp environment. My development environment runs under Windows and I mapped the folder with my php files to a network drive so Apache has access to them.(mount.cifs //pc/share /var/share/) This far no problems - I see my app on windows in the browser. The problem is, I can't write stuff in php to the share folder - everytime i got a permission denied message in my error logs. For testing purpose i tried to change the directory permissions of /var/share with chmod -R 777 /var/share without success. Now Iam a little bit stumped.. has anyone an idea how to solve this?

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• MySQL server hangs after approximately 1 month (CentOS)

  - by user25061

  Hey guys, I've got a web server running Apache/PHP and MySQL (CentOS), and MySQL seems to hang once every month or so. As far as I can tell, there are a few slow queries that are being resolved, but other than that I can't really see any reason why MySQL would hang. I'm having problems determining the problem - nothing is showing up in /var/log/mysqld.log, and again there are a few slow queries, but nothing out of the ordinary. Load is average at the time of the crashes... Can I please get some hints on how to work out the issue? I can't reproduce on our staging environment, so I'm a little stuck.

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• Routing traffic to a specific NIC in Windows

  - by Stoicpoet

  I added a 10GB NIC to a SQL server which is connected over to a backend storage using ISCSI. I would like to force traffic going to a certain IP address/host to use the 10gb NIC, while all other traffic should continue to use the 1GB NIC. The 10gb nic is configured using a private network. So far I have added a entry in the host file to the host I want to go over the private network and when I ping the host, it does return the private IP, but I'm still finding traffic going to the 1gb pipe. How can I force all traffic to this host to use the 10gb interface? Would the best approach be a static route? 160.205.2.3 is the IP to the 1gb host, I actually want to the traffic to route over an interface assigned 172.31.3.2, which is also defined as Interface 22. That said, would this work? route add 160.205.2.3 mask 255.255.255.255 172.31.3.2 if 22

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• Any benefit of /home Ubuntu partition

  - by nightcrawler

  I want to have dual OS of Win8 & Ubuntu 12.10. Provided that Ubuntu can access ntfs partition of Windows but same can't be said about Windows this leads to a question mark on the significance of having /home partition while installing Ubuntu. As far as I know /swap & / are the two partitions directly used by Ubuntu to store programs, installation & stuff while the documents/media resides in /home. Now because Ubuntu releases are more frequent than Windows & updates needs backup & relate stuff, so I came to decision to not to use /home at all, rather keep all my documents/media in ntfs, which would be untouched while upgrading Ubuntu as Win updates are once in a decade! Is my thinking correct? If yes, what would be the minimum space I should allot to /home plus how much I should allot to / one must know that I plan to use heavy applications like Maple, Matlab & Sagemath on Ubuntu.

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• Is there a pressure sensitive stylus for windows 8 power capacitative screen devices?

  - by JohnnyM

  I own a Dell XPS 12 Duo (filp-screen ultrabook with 10-point cap. screen) with Windows 8. Note: The ultrabook has Bluetooth 4.0. I would really love to have a preassure sensitive stylus that I could use to draw on the capacitative screen, when in tablet mode. So far I couldn't find any that would be compatible with Windows 8, maybe you guys could help. Must have: works with capacitative screen windows 8 compatible pressure sensitive Important: thin tip Nice to have: palm rejection tilt sensitive extra buttons (lots of them) TIA

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• How do I find the correct Modeline to connect my computer to my Televsion

  - by Mikelane

  I've been trying to hook up a Ubuntu computer with my Panasonic TH-42PA60A Plasma television for weeks now. My original question was asked here, which includes all the specifications about the Television in detail and how I've connected the computer to the televsion. So far, I've tried hooking up three other computers; 2 Ubuntu computers with fairly new graphic cards, and a Windows XP computer. None of them have been able to display an image on the television. The closest I've come to getting a picture up is with my small laptop running Ubuntu, however the image came out all purple and distorted. I had gotten the image by adding extra modes via the xrandr command, using a process similar to described here. I realize it might be possible to get this working if I had the correct modeline. I've checked the Modeline database, but the Panasonic TH-42PA60A is not listed. How can I find the correct modeline for my television. What commands can I use? I've read that there may be a danger of damaging my TV when doing things like this. What things should I avoid to prevent damaging my television?

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• Apache rewrite rules behind a nginx proxy

  - by Tuinslak

  Hi, I am running nginx (:80) in front of an Apache webserver (:8080) Nginx config (snippet): location / { proxy_pass http://www.domain.tld:8080; proxy_set_header X-Real-IP $remote_addr; If I set localhost instead of www.domain.tld, my browser gets redirect to http://localhost:8080. Apache rewrite rules: RewriteEngine On Options +FollowSymlinks RewriteBase / RewriteCond %{HTTP_HOST} !^www\. RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_URI} !\..+$ RewriteCond %{REQUEST_URI} !/$ RewriteRule (.*) http://%{HTTP_HOST}/$1/ [L,R=301] RewriteCond %{REQUEST_URI} !v2/ RewriteRule ^(.*)$ v1/$1 [L] So far, so good. However, every link (which uses relative paths) appears as http://www.domain.tld:8080/page instead of staying on port 80. Is there any way to solve this through the rewrite rules? I don't want to use absolute paths. Thanks

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