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• Find out if there is a local user logged in when logging in over ssh

  - by sebastiangeiger

  I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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• How to Configure Source NAT (Private IP => Public IP Outbound)

  - by DavidScherer

  I'm running VMWare ESXi Free and have Zentyal SBS 3.2 running as a Gateway. I have 5 Public IPS (CIDR/29, let's call them 69.1.1.1 - 69.1.1.5) and currently Zentyal is bound to 69.1.1.1 as the Gateway, with the other 4 Public IPs set as Virtual Interfaces in Zentyal (wan2-wan5) I have machines sitting on the Private Network (10.34.251.x) that, when going Outbound (to Google for instance) should be seen by the Internet as an IP other than the Gateway (69.1.1.1), this is because our machines need to be able to communicate with 3rd party APIs that expect these requests to come from a specific IP. From what I could find, SNAT (Source NAT) in Zentyal is used to achieve this, but I'm not sure how to configure it and cannot find a specific piece of Documentation for it at Zentyal. I've tried setting this up a couple different ways, with no results and at this point I have no idea if I'm going about this completely wrong, or my lack of experience with networking and the associated terminology is preventing me from placing the correct values in the correct fields. I get the following form to set up "SNAT" rules in Zentyal: Perhaps someone can offer some guidance and definitions for the fields above? SNAT Address Is this the Public IP I want to masquerade? Outgoing Interface Should this by my External NIC (one connected to Public 'Net), or is it the "Private" interface? It sounds as though this should be the External interface as I want the traffic from the internal network sent Out over this Interface (using a different IP than normal, anyway) Source Is the the Source on the internal network (one of the private IPs?), a public IP I want to masquerade as, or something else entirely? Destination Is this a place on the Internet (eg, "Only do this for the Site Google.com"/IP) or am I allowing myself to become confused again? Service I'm assuming this allows me to restrict which services this rule will apply to, but is it for a service on the internal network or a service being accessed on the external network? If I can offer any further details or information to make what I'm trying to do more clear, I will happily do so. Honestly any kind of help here would be very appreciated. I'm not a NetOps or anything even close, I spend most of my day writing code and my entire "team" at this company consists of "me, myself, and I" so while I try to broaden my KB at every possible opportunity, I can only learn so much, so fast and I feel like with networking especially there's just so much, coupled with a learning curve for each solution that likes to (from my limited perspective) use slightly different terminology that what I'm used to (and I don't exactly have the necessary experience to cross reference this stuff with the stuff I already know in context).

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• files power_profile and power_method missing on ubuntu 12.04 after clean isntall

  - by Nikola

  OK here is the problem,I am using gnome-shell, ubuntu 12.04, kernel 3.2.0-32-generic-pae and the proprietary drivers for my ati card (Installed via "additional drivers") , the laptops is a hp 4310s probook and i want to control the power_profiles and power_method , because my GPU temp is high. before i reinstalled ubuntu 12.04, i used the .sh method on startup to write to those files, and everything worked like a charm, but now they are missing, and i can't create them.this is what i get when i try to create the directories mkdir: cannot create directory `/sys/class/drm': No such file or directory How can i can get them back?if you need some information , just ask and i will give it.

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• How do I change my PYTHONPATH to make 3,2 my default Python instead of 2.7.2?

  - by max

  I have python3.2 located in /usr/lib/python3.2. I am not sure if that means it's installed but I assume it is for now. Some facts about my system: $ which python /usr/local/bin/python When I type python in terminal I get the following $ python Python 2.7.2 (default, Dec 19 2011, 11:12:13) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. Then to find the path I do >>> sys.info >>> sys.path ['', '/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg', '/usr/local/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg', '/usr/local/lib/python2.7/site-packages/PIL-1.1.7-py2.7-linux-x86_64.egg', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7', '/usr/local/lib/python2.7/plat-linux2', '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', '/usr/local/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/site-packages'] So knowing all of this, how do I change my default system python from 2.7.2 to 3.2?

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• Why did this command make my Ubuntu more awesome than before?

  - by the_misfit

  After running Ubuntu for months and liking it, I for the first time wanted to use headphones and was trying to get them to work so I ran the code in step 1 https://help.ubuntu.com/community/SoundTroubleshootingProcedure -- the result was an improvement in performance, resolution, and audio.. a vast improvement. What does that suggest about what was wrong with my settings before if running this improved system performance, graphics, and my audio problem? The command is: sudo add-apt-repository ppa:ubuntu-audio-dev/ppa; sudo apt-get update;sudo apt-get dist-upgrade; sudo apt-get install linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; sudo apt-get -y --reinstall install linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; killall pulseaudio; rm -r ~/.pulse*; sudo usermod -aG `cat /etc/group | grep -e '^pulse:' -e '^audio:' -e '^pulse-access:' -e '^pulse-rt:' -e '^video:' | awk -F: '{print $1}' | tr '\n' ',' | sed 's:,$::g'` `whoami`

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• Why does my fan run so hard on my Dell XPS 15z?

  - by Kilhoffer

  I recently bought a Dell XPS 15z. It came with Windows 7 Home Premium, but I really wanted to try out Ubuntu on it. I ran the Windows installer and was surprised how smooth the process was. Within 10 minutes, I had a dual boot setup with Ubuntu 11.10. It boots into Ubuntu just fine and everything seems to work. I've read a lot about problems with touchpad and wireless, but honestly, I've had none of those issues. The only thing that's really bothering me is the fan constantly runs fast. Under Windows, it rarely ever came on and when it did, it wasnt spinning that fast. What could be going on under Ubuntu that would cause this? I want to get that under control because I want to use Ubuntu as my primary OS and screw Windows. Any help would be much appreciated! Note: I've read that others have set acpi=false, but I have not made any changes to the default installation. Should I make that change?

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• How to uninstall Ubuntu Software Center in 11.10?

  - by sainath

  I am trying to uninstall software center for ubuntu oneric using the command sudo apt-get remove software center and get this as result Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package software E: Unable to locate package center I did it once and got it fixed but now it does't work. I have an issue with the software center it keeps on repeatedly giving message saying send error.

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• How do I detect when my system wakes up from suspend via DBus or similar in a python app?

  - by con-f-use

  In a background Python script I need to detect, when the system just woke up from suspend. What is a good way that does not rely on a root script but rather on python modules such as DBus? I'm new to dbus so I could really use some example code. From what I read it's related to org.freedesktop.UPower /org/freedesktop/UPower org.freedesktop.UPower.Resuming Can anyone help me out with some code that connects the resuming signal to callback?

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• How to make Linux to re-detect network interfaces?

  - by ablmf

  For some reason, ifcfg-eth* under /etc/sysconfig/network-script were deleted. Is there any tools that could detect network interfaces and re-generate these files? Another question : If I manually added ifcfg-eth0, is there any method to make it work without reboot? I tried "/etc/init.d/networking restart", and it doesn't work.

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• Wait Statistics in Microsoft SQL Server

  - by KKline

  When it comes to troubleshooting in relational databases, there's no better place to start than wait statistics. In a nutshell, a wait statistic is an internal counter that tells you how long the database spent waiting for a particular resource, activity, or process. Since wait statistics are categorized by type, one look will quickly tell the variety of problem that needs your attention, assuming you know meaning for Microsoft's lingo for each wait type....(read more)

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• Weird graphical issues with Gnome Shell in 12.10

  - by Chintan Parikh

  I finally got Gnome Shell working on Ubuntu 12.10, but there are some weird graphical issues. It seems as if the text is corrupted or something. Here's a screenshot of what I'm talking about: http://i.imgur.com/OqGyl.png It happens on a bunch of different applications, but not when I'm using Ubuntu. Does anyone know why or how to fix it? My graphics card is an AMD Radeon HD 6540G2, and I'm using the open source drivers (fglrx doesn't work with 12.10 yet).

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• How to install Opera Browser?

  - by bruce

  I am trying to install opera browser from the terminal. I downloaded the 'debian' installer because it didn't show up in software center. It completely destroyed my software center - it is frozen and I have no idea how to fix (I have a different thread for that though). Can I use this thing called synaptic package manager to install Opera? or am I stuck with Firefox? How do I install Opera Browser?

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• Is there a shell-independent HUD-like menu search tool for Gnome?

  - by Redsandro

  The Ubuntu HUD - you love it or you hate it. Personally I rather like a classic desktop, so I use Xfce and Cinnamon, and I don't want to lose my menu in applications. But the HUD is pretty awesome when your menus are complex and you forgot where an option sits. This makes that search trick very interesting. I know the HUD is Unity specific. I am looking for a HUD-like tool to complement the menu in shells other than Unity. There is Appmenu Runner for KDE that does this. There is also appmenu-qt for KDE. Problem with the above is that it uses KDE libs, and it only works for KDE apps. This is Linux, there aught to be something like this for GNOME/GTK apps, right? Looking for any tool that can search the menus. I already use(d) Kupfer and Gnome-do, something like that would suffice if only it includes searching the menus for the currently focussed application.

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• How to generate an extended F key press (F13-F20)?

  - by Emilien

  I need to submit an extended function key (like F17 or F17 ) to a program that runs in the terminal (I use the default gnome-terminal but could use another if it works there). Is there a way in Ubuntu 11.04 to generate those key hits? I'm searching for something like Shift+F7 to generate F17 (what I currently use in Reflection under Windows). My keyboard is set to generic 105 keys PC with the US Qwerty layout.

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• Alternative to | more to display error results page by page

  - by Lane

  The command psql -d template_postgis2 -f /usr/share/postgresql/9.1/contrib/postgis-2.1/postgis.sql returns a list of errors that is too long to be displayed by scrolling up to the beginning of the error. I tried the same command with "| more" and "| less" added up at the end of the command but it does not display the message page by page as it should. I also tried to put the output in a file with "> file.txt" but I do not get in this new file what is displayed on the screen!! I don't understand why. I guess i can't do this with a psql command?? Is there any other way to get all the error message? Thanks for your help!

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• receiving "command not found" error messages after fresh reinstall of Lubuntu 14.04

  - by user236378

  Lubuntu 14.04 was working really great. . .until I messed up and had to do a complete fresh reinstall. Now I receive error messages when I input commands into the Terminal, even after immediately completing the fresh install. For example I type: sudo leafpad ?/etc/default/ or sudo leafpad ?/etc/default/grub I get: sudo: leafpad: command not found I type: sudo update-initramfs ?-u or sudo update-grub I get: sudo: update-initramfs: command not found or sudo: update-grub: command not found If I use the command mkdir I get: mkdir: command not found I also get this same exact error message, command not found, with sudo apt-get and wget In other words I can't do anything that I was able to do when inputting commands into the terminal. So I cannot add any repositories or update anything at all. I am not really sure what is causing the problem(s). It appeared to me that Lubuntu installed and booted up OK. However just as soon as I enter anything into the Terminal I immediately get the above error messages. I have tried to do the reinstall three times, same error messages. If anyone can suggest any fixes I would really appreciate it very much. Thank you!

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• 12.10 starts up to just my desktop background [closed]

  - by Alex

  Possible Duplicate: Unity does not start after installing the fglrx drivers on 12.10 I have only just started using linux more than just instlling it on an old pc for fun and have just changed the driver settings from the default option. The computer starts up and goes through everything else well, but at slightly lower resolution. Once signing on to Ubuntu, it only displays my desktop background and cursor. Can i restore it to the default driver settings? I've spent a while transferring files and don't want to reinstall Ubuntu.

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• Please help for change wallpaper on terminal where image from http (ubuntu 12.04)

  - by Yan Fachmi

  I need to change the background of my desktop in Ubuntu 12. 04 with a command in terminal, in order to make a script with bash. Does anyone know how to do it? but i want the image from internet... i know if i use local image would like this : gsettings set org.gnome.desktop.background picture-uri file:///home/icorner/wallpaper/curr.jpg but if i use something like this wont work gsettings set org.gnome.desktop.background picture-uri http://www.sergiuhelldragoon.com/wp-content/uploads/2012/04/dota_2_wallpaper_1_1280x800_by_zadelim.jpg Please anyone or somebody?... Thanks & regards, Yan Fachmi

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• Is it possible for an application (written in Mono C#) to run a console command?

  - by Razick

  I am wondering if a Mono C# application can somehow run a terminal command. For example, could the user give the program his or her password and then have the application run sudo apt-get install application-name (console requests password) password (console requests confirmation) y Preferably, this would be done without actually opening a terminal visible to the user, so that the application could provide the necessary feedback and manage the whole operation cleanly with as little user interaction as possible. Is there a way to do that? Let me know if clarification is needed. Thank you!

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• What are some good examples of Powernap scripts and its use?

  - by shootingstars

  I would like to use powernap for putting my media server into suspend mode, and I haven't been able to find any example /etc/powernap/action scripts out there, except these: one two three Does anybody have a good script or recommend particular techniques with its use? From the comments of the default /etc/powernap/action script: # You may do one of: # 1) Write your own custom script below and make this file executable, # calling some specific action, such as: # /usr/sbin/pm-suspend # /usr/sbin/pm-hibernate # /sbin/poweroff # echo 'I am wasting electricity' | mail [email protected] # 2) Replace this file with an executable script or binary # 3) Symlink this file to some other executable script or binary

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• Ubuntu 12.04LTS loads straight to terminal!! startx doesn't work!

  - by user293256

  I have been using ubuntu 12.04LTS for last few months, and now suddenly something has happened to it. As a result, terminal opens on every start up when I login . Although, if i login as a guest, it works fine. I have already used startx command, and tried reinstalling the desktop as well but it doesn't work! If I use ctrl+alt+f9, terminal screen vanishes and a black screen appears, and then nothing happens after that. ctrl+alt+f1 takes me to the command prompt. I know similar questions have been asked here, but i could not find a solution for my laptop. Please help!!

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• Hibernation is still missing from menu in 13.10 after enabling via polkit. How to enable?

  - by LiveWireBT

  I know that since 12.04, we need to add a policykit rule to enable hibernation (see question How to enable hibernation? and the Official Documentation). I can successfully bring my laptop into hibernation mode with sudo pm-hibernate or sudo s2disk, so the rule is in place and works, but the hibernation entry is still missing in the menu. I can tell from looking through the source of the indicator-session package (but not understanding the whole code) that there is still a hibernation menu entry in the code and it should be displayed when the system is capable of hibernating. Please calm down if you're enraged by this. This is very unlikely to be a conspiracy, but rather a bug/regression on a deeper level, which can happen when you move code around or replace it. Question: What needs to be done in 13.10 to properly tell indicator-session that the system can hibernate? Possible duplicate: Hibernation still not available - No activity, because saucy was in development at that time, so out of scope for AskUbuntu. Related bug report: https://bugs.launchpad.net/ubuntu/+source/indicator-session/+bug/1232814

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• Cisco NAT vs Bridge vs BVI

  - by cjavapro

  The only devices on this particular LAN will all have public IP addresses. Also the public IP address will be configured directly on the machine,,, so we will not translate private/public IP addresses. If we use NAT,, we would have to translate the public IP on the WAN to the public IP on the LAN. The only security feature I expect on the gateway is an access list. I don't really know much about networking, so I am sorry if this question is generic.

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• Network Services disabled (not starting) on Windows XP

  - by Rickesh John

  I am currently running Windows XP Service Pack 3 on my system. But today, when I failed to connect to the internet, via a LAN cable, I realized that almost all of the vital network services had stopped functioning. Any attempts to start it through services.msc gives me the following message: Could not start the DNS Client Service on Local Computer Error 1068: The dependency service group failed to start All my software or services that are related to networking have stopped functioning, for example, Windows Firewall is turned off permanently, so is my Avast Anti-Virus' service of Real Time Shields and Web Shield. When I insert the LAN wire into my laptop, it registers itself, but this is what I get when I do a ping localhost C:>ping localhost Unable to contact IP driver, error code 2 Moveover, with ipconfig I get this : Windows IP Configuration An internal error occurred: The request is not supported. Please contact Microsoft Product Support Services for further help. Additional Information: Unable to query host name On some further poking around, I saw that none of the "NETWORK SERVICE" process in task manager, except svchost.exe were running. Also, when I first opened the task manager, I saw some 20 processes running with username column empty for most of them. With some search in Google, I found out that these services were important, DHCP DNS Net logon Network connection Network location Awareness TCP/IP Net BIOS Helper none of them, except Network Connections are working, they do not start. The event viewer of my system shows a bunch of 7000 and 7001 event errors. I have tried re installing the network driver, booting in safe mode with networking and tried to enable those services mentioned above. I had disabled System Restore some time back, so I have no restore points for my system. I tried a lot of things from Google searches but none of them worked. Also, with such a long list of issue, I am a little confused as to what should I search on the internet. :( One more thing I would like to mention, previous morning, my anti-virus Avast detected a RootKit buried deep in my system folders. It was removed, but maybe this was a problem caused by the root kit. I did run a boot-time scan but no viruses were found. Please please please advice. Is formatting and re-installation of Windows my only option?

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• Making a file with terminal commands?

  - by iSeth

  In Windows I can write a file containing commands for cmd (usually .cmd or .bat files). When I click on those files it will open cmd.exe and run them commands the file contains. How would I do this in Ubuntu? I'm sure this is a duplicate, but I can't find my answer. Its similar to these questions, but they don't answer the question: Store frequently used terminal commands in a file CMD.exe Emulator in Ubuntu to run .cmd/.bat file

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