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  • How do I align the bottom edges of two monitors with xrandr?

    - by denaje
    I have two outputs that I'd like to use on my laptop: LVDS1 - 1366x768 HDMI1 - 1920x1080 I set my monitors up like so: xrandr --output LVDS1 --auto --output HDMI1 --auto --right-of LVDS1 This is all well and good, but my laptop sits considerably lower than my external monitor, and with the top edges of the screens being aligned, it makes the jump from one screen to the other rather unintuitive. Is there a way I can align the bottom edges instead? I thought I could use the --pos flag to do this, but I have tried and not seen any difference (perhaps I do not know how to use it properly). EDIT: Solved. Thanks to tink's link, I deconstructed the Python script and discovered the way to do this is as follows: xrandr --output LVDS1 --pos 0x312 # 312 = 1280 - 768 xrandr --output HDMI1 --pos 1366x0 Not sure I understand exactly what the --pos flags are doing here, but it at least works!

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  • Set up proxy for vpn server on ubuntu server 12.4

    - by Morteza Soltanabadiyan
    I have a vpn server with HTTPS, L2TP, OPENVPN, and PPTP. I want to set up a proxy on the server, so all connection that comes from vpn clients, they will use that. I created the following bash script file for it, but the proxy isn't working. gsettings set org.gnome.system.proxy mode 'manual' gsettings set org.gnome.system.proxy.http enabled true gsettings set org.gnome.system.proxy.http host 'cproxy.anadolu.edu.tr' gsettings set org.gnome.system.proxy.http port 8080 gsettings set org.gnome.system.proxy.http authentication-user 'admin' gsettings set org.gnome.system.proxy.http authentication-password 'admin' gsettings set org.gnome.system.proxy use-same-proxy true export http_proxy=http://admin:[email protected]:8080 export https_proxy=http://admin:[email protected]:8080 export HTTP_PROXY=http://admin:[email protected]:8080 export HTTPS_PROXY=http://admin:[email protected]:8080 What to do to make a global proxy for server and all vpn clients to use it automatically?

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  • Connect devices plugged into Raspberry Pi ethernet to WiFi network

    - by Tom
    I'm just starting out on a mission to learn more about networking and I've followed a tutorial (http://raspberrypihq.com/how-to-turn-a-raspberry-pi-into-a-wifi-router/) to turn my Raspberry Pi into a wifi router. That worked really well so I modified it slightly so that I can use a tethered iphone for the internet connection - I just switched all "eth0" references to "eth1" (the iphone interface) and added a script to set everything up when the phone is plugged in. This setup has freed up the Pi's ethernet port so I'd like to try and take this a step further and allow devices plugged into it to connect to the network. If possible, I'd like to try adding a switch so I can connect multiple devices. I've tried fiddling around with nat & iptables with no luck so my question is, how can I connect devices on eth0 to my wlan network?

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  • Robocopy Mirror Backup gone awry

    - by Aznfin
    I have created a simple batch file script for running Robocopy. It is set to make a backup of my user account folder to my external hard drive. Here's the parameters for Robocopy: ROBOCOPY "C:\Users\Finnly" "F:\Backups\Finnly (Backup)" /ZB /COPY:DAT /DCOPY:T /MIR /256 /MT:32 /XF *.log *.log* *.dat *.tmp *.temp *.old "ntuser*" "SyncToy*" "UpgKit.txt" ".recently-used.xbel" /XD ".gimp-2.6" ".thumbnails" ".VirtualBox" "AppData" "Application Data" "Adobe" "Camtasia Studio" "Cookies" "CyberLink" "DivX Movies" "DVD Architect Pro 5.0 Projects" "dwhelper" "GTA San Andreas User Files" "Lightroom" "Local Settings" "NetHood" "PrintHood" "Scripts" "temp" "Templates" "The KMPlayer" "Tracing" /R:3 /W:10 /V /TS /FP /ETA /LOG+:F:\Backups\Sync.log /TEE For some reason when I run it, it backs up the files and then it seems to back them up again. The size of my user account directory is 18.3 GB but the backup of it occupies over 30 GB. After reading the contents of the log generated, it is obvious that it's copying files more than once. Why is this happening? I'm running Windows Seven Home Premium 64-bit.

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  • ubuntu: sending mail with postfix?

    - by ajsie
    i've got some questions about how it works: so ubuntu server comes with postfix installed. if i want my php script to send a mail to lets say [email protected], how does it work? do i have to specify any ip to another MTA (my ISP's MTA?) in postfix's configuration file? and if someone sends back, will it get to my ip? is it postfix that receives it? or has it to do with fetchmail?

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  • Hiding the Flash Message After a Time Delay

    - by Madhan ayyasamy
    Hi Friends,The flash hash is a great way to provide feedback to your users.Here is a quick tip for hiding the flash message after a period of time if you don’t want to leave it lingering around.First, add this line to the head of your layout to ensure the prototype and script.aculo.us javascript libraries are loaded:Next, add the following to either your layout (recommended), your view templates or a partial depending on your needs. I usually add this to a partial and include the partial in my layouts. "flash", :id = flash_type % "text/javascript" do % setTimeout("new Effect.Fade('');", 10000); This will wrap the flash message in a div with class=‘flash’ and id=‘error’, ‘notice’ or ‘warn’ depending on the flash key specified.The value ‘10000’ is the time in milliseconds before the flash will disappear. In this case, 10 seconds.This function looks pretty good and little javascript stunts like this can help make your site feel more professional. It’s also worth bearing in mind though, not everybody can see well or read as quickly as others so this may not be suitable for every application.Update:As Mitchell has pointed out (see comments below), it may be better to set the flash_type as the div class rather than it’s id. If there is the possibility that you’ll be showing more than one flash message per page, setting the flash_type as the div id will result in your HTML/XHTML code becoming invalid because the unique intentifier will be used more than once per page.Here is a slightly more complex version of the method shown above that will hide all divs with class ‘flash’ after a time delay, achieving the same effect and also ensuring your code stays valid with more than one flash message! "flash #{flash_type}" % "text/javascript" do % setTimeout("$$('div.flash').each(function(flash){ flash.hide();})", 10000); In this example, the div id is not set at all. Instead, each flash div will have class “div” and also class of the type of flash message (“error”, “warning” etc.).Have a Great Day..:)

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  • How to create a folder in SharePoint2010 root folder and set permission to it

    - by ybbest
    If you need to create a folder in SharePoint2010 root folder and set permission to it, here is piece of code that does it. In the script, I have created a folder called Temp in Logs folder under SharePoint2010 root and then I grant read/write access to the Windows group WSS_WPG and full access to the group WSS_ADMIN_WPG for that folder. $Folder=New-Item "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\LOGS\temp" -Type Directory -force $acl = Get-Acl $Folder ##The following line has been commented out , if you like to break the permission inheritance from the parent floder , uncommented the code. #$acl.SetAccessRuleProtection($True, $False) $rule = New-Object System.Security.AccessControl.FileSystemAccessRule("WSS_ADMIN_WPG","FullControl", "ContainerInherit, ObjectInherit", "None", "Allow") $acl.AddAccessRule($rule) $rule = New-Object System.Security.AccessControl.FileSystemAccessRule("WSS_WPG","Modify", "ContainerInherit, ObjectInherit", "None", "Allow") $acl.AddAccessRule($rule) Set-Acl $Folder $acl References: http://technet.microsoft.com/en-us/library/ff730951.aspx http://msdn.microsoft.com/en-us/library/tbsb79h3.aspx http://blogs.technet.com/b/josebda/archive/2010/11/12/how-to-handle-ntfs-folder-permissions-security-descriptors-and-acls-in-powershell.aspx http://chrisfederico.wordpress.com/2008/02/01/setting-acl-on-a-file-or-directory-in-powershell/

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  • How to install MariaDB rpms in CentOS 6.4 using rpm (not yum cmd) + handling mysql-libs conflicts

    - by Pat C
    I need to script the install of MariaDB using the rpm command in CentOS 6.4. I can't use yum since it's going to be an offline install so there's no access to the repository. The only MySQL package installed is mysql-libs as various other packages in CentOS depend on it. When I did a test install of MariaDB with yum it correctly accounted for mysql-libs and uninstalled it at the end as MariaDB could handle the dependencies after it was installed: [root@new-host-6 ~]# yum install MariaDB-client MariaDB-common MariaDB-compat MariaDB-devel MariaDB-server MariaDB-shared Loaded plugins: downloadonly, fastestmirror, refresh-packagekit, security, verify Loading mirror speeds from cached hostfile * base: mirrors.kernel.org * extras: mirror.keystealth.org * updates: mirror.umd.edu Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package MariaDB-client.x86_64 0:5.5.32-1 will be installed ---> Package MariaDB-common.x86_64 0:5.5.32-1 will be installed ---> Package MariaDB-compat.x86_64 0:5.5.32-1 will be obsoleting ---> Package MariaDB-devel.x86_64 0:5.5.32-1 will be installed ---> Package MariaDB-server.x86_64 0:5.5.32-1 will be installed ---> Package MariaDB-shared.x86_64 0:5.5.32-1 will be obsoleting ---> Package mysql-libs.x86_64 0:5.1.66-2.el6_3 will be obsoleted --> Finished Dependency Resolution Dependencies Resolved ==================================================================================================================================================================== Package Arch Version Repository Size ==================================================================================================================================================================== Installing: MariaDB-client x86_64 5.5.32-1 mariadb 10 M MariaDB-common x86_64 5.5.32-1 mariadb 23 k MariaDB-compat x86_64 5.5.32-1 mariadb 2.7 M replacing mysql-libs.x86_64 5.1.66-2.el6_3 MariaDB-devel x86_64 5.5.32-1 mariadb 5.6 M MariaDB-server x86_64 5.5.32-1 mariadb 34 M MariaDB-shared x86_64 5.5.32-1 mariadb 1.1 M replacing mysql-libs.x86_64 5.1.66-2.el6_3 Transaction Summary ==================================================================================================================================================================== Install 6 Package(s) Total download size: 53 M Is this ok [y/N]: y Downloading Packages: (1/6): MariaDB-5.5.32-centos6-x86_64-client.rpm | 10 MB 00:06 (2/6): MariaDB-5.5.32-centos6-x86_64-common.rpm | 23 kB 00:00 (3/6): MariaDB-5.5.32-centos6-x86_64-compat.rpm | 2.7 MB 00:02 (4/6): MariaDB-5.5.32-centos6-x86_64-devel.rpm | 5.6 MB 00:06 (5/6): MariaDB-5.5.32-centos6-x86_64-server.rpm | 34 MB 00:23 (6/6): MariaDB-5.5.32-centos6-x86_64-shared.rpm | 1.1 MB 00:00 -------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 1.3 MB/s | 53 MB 00:40 warning: rpmts_HdrFromFdno: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY Retrieving key from https://yum.mariadb.org/RPM-GPG-KEY-MariaDB Importing GPG key 0x1BB943DB: Userid: "Daniel Bartholomew (Monty Program signing key) <[email protected]>" From : https://yum.mariadb.org/RPM-GPG-KEY-MariaDB Is this ok [y/N]: y Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : MariaDB-compat-5.5.32-1.x86_64 1/7 Installing : MariaDB-common-5.5.32-1.x86_64 2/7 Installing : MariaDB-server-5.5.32-1.x86_64 3/7 chown: cannot access `/var/lib/mysql': No such file or directory PLEASE REMEMBER TO SET A PASSWORD FOR THE MariaDB root USER ! To do so, start the server, then issue the following commands: '/usr/bin/mysqladmin' -u root password 'new-password' '/usr/bin/mysqladmin' -u root -h new-host-6 password 'new-password' Alternatively you can run: '/usr/bin/mysql_secure_installation' which will also give you the option of removing the test databases and anonymous user created by default. This is strongly recommended for production servers. See the MariaDB Knowledgebase at http://kb.askmonty.org or the MySQL manual for more instructions. Please report any problems with the '/usr/bin/mysqlbug' script! The latest information about MariaDB is available at http://mariadb.org/. You can find additional information about the MySQL part at: http://dev.mysql.com Support MariaDB development by buying support/new features from Monty Program Ab. You can contact us about this at [email protected]. Alternatively consider joining our community based development effort: http://kb.askmonty.org/en/contributing-to-the-mariadb-project/ Installing : MariaDB-devel-5.5.32-1.x86_64 4/7 Installing : MariaDB-client-5.5.32-1.x86_64 5/7 Installing : MariaDB-shared-5.5.32-1.x86_64 6/7 Erasing : mysql-libs-5.1.66-2.el6_3.x86_64 7/7 Verifying : MariaDB-common-5.5.32-1.x86_64 1/7 Verifying : MariaDB-server-5.5.32-1.x86_64 2/7 Verifying : MariaDB-devel-5.5.32-1.x86_64 3/7 Verifying : MariaDB-client-5.5.32-1.x86_64 4/7 Verifying : MariaDB-compat-5.5.32-1.x86_64 5/7 Verifying : MariaDB-shared-5.5.32-1.x86_64 6/7 Verifying : mysql-libs-5.1.66-2.el6_3.x86_64 7/7 Installed: MariaDB-client.x86_64 0:5.5.32-1 MariaDB-common.x86_64 0:5.5.32-1 MariaDB-compat.x86_64 0:5.5.32-1 MariaDB-devel.x86_64 0:5.5.32-1 MariaDB-server.x86_64 0:5.5.32-1 MariaDB-shared.x86_64 0:5.5.32-1 Replaced: mysql-libs.x86_64 0:5.1.66-2.el6_3 Complete! My question is, what is the equivalent way to install the MariaDB packages using the rpm command only as opposed to yum? If I do rpm -ivh MariaDB*.rpm, I will get a ton of messages like the following about conflicts with mysql-libs: file /etc/my.cnf from install of MariaDB-common-5.5.32-1.x86_64 conflicts with file from package mysql-libs-5.1.66-2.el6_3.x86_64 file /usr/share/mysql/charsets/Index.xml from install of MariaDB-common-5.5.32-1.x86_64 conflicts with file from package mysql-libs-5.1.66-2.el6_3.x86_64 I then used the --force option to install the MariaDB rpms and uninstalled mysql-lib, I didn't get any weird messages but I'm not sure that is the cleanest method to handle the conflicts and do the install. So can someone confirm that installing MariaDB with the following rpm commands would be the same as using yum to install the packages and handle mysql-libs conflicts/removal: rpm -ivh --force MariaDB*.rpm rpm -e mysql-libs Thanks for any input!

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  • How to Kill and Alternate X session via cli

    - by L. D. James
    Can someone tell me how to remove dormant X sessions. This question is similar to Logging out other users from the command line, but more specific to controlling X displays which I find hard to kill. I used the command "who -u" to get the session of the other screens: $ who -u Which gave me: user1 :0 2014-08-18 12:08 ? 2891 (:0) user1 pts/26 2014-08-18 16:11 17:18 3984 (:0) user2 :1 2014-08-18 18:21 ? 25745 (:1) user1 pts/27 2014-08-18 23:10 00:27 3984 (:0) user1 pts/32 2014-08-18 23:10 10:42 3984 (:0) user1 pts/46 2014-08-18 23:14 00:04 3984 (:0) user1 pts/48 2014-08-19 04:10 . 3984 (:0) The kill -9 25745 doesn't appear to do anything. I have a workshop where a number of users will use the computer under their own login. After the workshop is over there are a number of logins that are left open. I would prefer to kill the open sessions rather than try to log into each users' screen. Again, this question isn't just about logging users' out. I'm hoping to get clarity also for killing/removing stuck processes that are hard to kill. New Info While still pondering how to kill the process I wrote the following script, which did it: #!/bin/bash results=1 while [[ $results > 0 ]] do sudo kill -9 25745 results=$? echo -ne "Response:$results..." sleep 20 done After a graceful waiting period, if there isn't a better answer I'll mark this as answered with this resolution. This may resolve the problem with other stuck processes I have had in the past.

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  • SQL SERVER – Copy Database – SQL in Sixty Seconds #067

    - by Pinal Dave
    There are multiple reasons why a user may want to make a copy of the database. Sometimes a user wants to copy the database to the same server and sometime wants to copy the database on a different server. The important point is that DBA and Developer may want copies of their database for various purposes. I copy my database for backup purpose. However, when we hear coping database – the very first thought which comes to our mind is – Backup and Restore or Attach and Detach. Both of these processes have their own advantage and disadvantages. The matter of the fact, those methods is much efficient and recommended methods. However, if you just want to copy your database as it is and do not want to go for advanced feature. You can just use the copy feature of the SQL Server. Here are the settings, which you can use to copy the database. SQL in Sixty Seconds Video I have attempted to explain the same subject in simple words over in following video. Action Item Here are the blog posts I have previously written on the subject of SA password. You can read it over here: Copy Database from Instance to Another Instance – Copy Paste in SQL Server Copy Database With Data – Generate T-SQL For Inserting Data From One Table to Another Table Copy Data from One Table to Another Table – SQL in Sixty Seconds #031 – Video Generate Script for Schema and Data – SQL in Sixty Seconds #021 – Video You can subscribe to my YouTube Channel for frequent updates. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: Joes 2 Pros, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Book Review, SQLAuthority News, T SQL, Video

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  • Change Gnome panel profile according to number of displays

    - by ifischer
    I'm running Ubuntu 10.04 on a Laptop. I have a startup script which enables external displays, if they are connected. It runs at GDM startup, configured in /etc/gdm/Init/Default. When i'm running without external displays, Gnome should use 2 Panels. When i'm using 2 external displays, Gnome should add an additional Panel to the second display. But this should of course be removed again if i detach the external displays (and restart). Can i configure this use case by using Gnome Panel-profiles? I read that there is a startup option "--profile" for gnome-panel, but i don't know how and where i could switch the profile, especially because this has to be done after recognizing the number of displays. Or can i add a general Gnome profile and switch between those profiles somehow to achieve this behavior?

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  • magento on Zend Server (Win7) installation error

    - by czerasz
    I try to install magento for the first time. I've created the database with the name "project" in my C:\Zend\Apache2\conf\httpd.conf I added on the end: <Directory "C:\Zend\Apche2\htdocs\project"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> in my ZendServer/Server Setup/Extensions: PDO_MySQL, simplexml, mcrypt, hash, GD, DOM, iconv, curl, SOAP are on in C:\Zend\ZendServer\etc\php.ini I set: safe_mode = Off ;<-- was set to off ... memory_limit = 512M; Maximum amount of memory a script may consume (128MB) After step "Configuration" of magento installation (with Use Web Server (Apache) Rewrites enabled) I get: Internal Server Error My database is full of tables (that schould be ok) My Zend Server shows: 27-Oct 06:55 6 Severe Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/installDb/ Critical Open 27-Oct 06:55 4 Fatal PHP Error C:\Zend\Apache2\htdocs\project\lib\Varien\Db\Adapter\Pdo\Mysql.php Critical Open 27-Oct 06:55 5 Slow Function Execution curl_exec Warning Open 27-Oct 06:55 5 Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/configPost/ What can be wrong?

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  • Video Thumbnails using ffmpeg

    - by LenzM
    I'm looking for a nice short easy way to create a series of thumbnails for any given video file. I'm almost there using ffmpeg, here's what I have: ffmpeg -i /tmp/video.avi -r 1 -ss 60 -r 1 foo-%03d.jpeg` The only problem is that this takes a shot every second and I'd like to make it every minute or so. I tried setting the -r value to 1/60 or .02 to no avail. For reference, here's the old script I was using that only worked for some files: #!/bin/bash # grab a screenshot every 60 seconds file=$1 orig_dir=`pwd` mins=`exiftool "$file" | grep "Duration" | awk -F : '{print $2}' | grep --only-matching '[0-9]*'` dir="$file-screenshots" mkdir "$dir" cd "$dir" mplayer -vo png -vf screenshot -sstep 60 -frames $mins -ao null "../$file" cd "$orig_dir" This doesn't have to be on the command line, it's just that it always ends up being easiest.

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  • Apache whitelist a single location, but require basic auth for everything else

    - by Chris Lawlor
    I'm sure this is simple, but Google is not my friend this morning. The goal is: /public... is openly accessible everything else (including /) requires basic auth. This is a WSGI app, with a single WSGI script (it's a django site, if that matters..) I have this: <Location /public> Order deny,allow Allow from all </Location> <Directory /> AuthType Basic AuthName "My Test Server" AuthUserFile /path/to/.htpasswd Require valid-user </Directory> With this configuration, basic auth works fine, but the Location directive is totally ignored. I'm not surprised, as according to this (see How the Sections are Merged), the Directory directive is processed first. I'm sure I'm missing something, but since Directory applies to a filesystem location, and I really only have the one Directory at /, and it's a Location that I wish to allow access to, but Directory always overrides Location... EDIT I'm using Apache 2.2, which doesn't support AuthType None.

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  • Implementing a multilanguage AI contest platform

    - by Alejandro Piad
    This is a followup to this question. To sum: I'm implementing an AI contest site, where each user may submit several AI implementations for different games. Think about Google AI Challenge but instead of just having a big event once a year, I would like it more on a league fashion, with all virtual players playing with each other every some close period of time. I want to support as many programming languages as possible. I've seen that contest sites (like codeforces) ask you to submit a source code and interact through stdin and stdout. The first question is: what is the best way of supporting multiple languages? As I see it, I can either ask people to upload some binary/script, and interact either through stdin/*stdout*, or sockets, or the file system; or ask people to submit source code, and wrap it with whatever is necessary for the interaction. I would like to skip the need to compile the code by myself (in the server, I mean), but I am willing to do it if its the "best" choice. I need to comunicate virtual players with each other, or even better, with some intermediary arbiter. The second question is regarding security. If I'm going to be running user code in my server, I want to ensure strict security conditions, like no file system access, no networking, etc. Otherwise it would be a safe heaven for hackers. I will be implementing the engine/arbiter in .NET. I would like to support at least C#, C++, Java and Python for the user's implementations. I'm willing to write interfaces for each of these languages to simplify the user interaction with the system. Thanks in advance.

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  • Command line safety tricks

    - by deadprogrammer
    Command line and scripting is dangerous. Make a little typo with rm -rf and you are in a world of hurt. Confuse prod with stage in the name of the database while running an import script and you are boned (if they are on the same server, which is not good, but happens). Same for noticing too late that the server name where you sshed is not what you thought it was after funning some commands. You have to respect the Hole Hawg. I have a few little rituals before running risky commands - like doing a triple take check of the server I'm on. Here's an interesting article on rm safety. What little rituals, tools and tricks keeps you safe on the command line? And I mean objective things, like "first run ls foo*, look at the output of that and then substitute ls with rm -rf to avoid running rm -rf foo * or something like that", not "make sure you know what the command will do".

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  • rm on a directory with millions of files

    - by BMDan
    Background: physical server, about two years old, 7200-RPM SATA drives connected to a 3Ware RAID card, ext3 FS mounted noatime and data=ordered, not under crazy load, kernel 2.6.18-92.1.22.el5, uptime 545 days. Directory doesn't contain any subdirectories, just millions of small (~100 byte) files, with some larger (a few KB) ones. We have a server that has gone a bit cuckoo over the course of the last few months, but we only noticed it the other day when it started being unable to write to a directory due to it containing too many files. Specifically, it started throwing this error in /var/log/messages: ext3_dx_add_entry: Directory index full! The disk in question has plenty of inodes remaining: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 60719104 3465660 57253444 6% / So I'm guessing that means we hit the limit of how many entries can be in the directory file itself. No idea how many files that would be, but it can't be more, as you can see, than three million or so. Not that that's good, mind you! But that's part one of my question: exactly what is that upper limit? Is it tunable? Before I get yelled at--I want to tune it down; this enormous directory caused all sorts of issues. Anyway, we tracked down the issue in the code that was generating all of those files, and we've corrected it. Now I'm stuck with deleting the directory. A few options here: rm -rf (dir)I tried this first. I gave up and killed it after it had run for a day and a half without any discernible impact. unlink(2) on the directory: Definitely worth consideration, but the question is whether it'd be faster to delete the files inside the directory via fsck than to delete via unlink(2). That is, one way or another, I've got to mark those inodes as unused. This assumes, of course, that I can tell fsck not to drop entries to the files in /lost+found; otherwise, I've just moved my problem. In addition to all the other concerns, after reading about this a bit more, it turns out I'd probably have to call some internal FS functions, as none of the unlink(2) variants I can find would allow me to just blithely delete a directory with entries in it. Pooh. while [ true ]; do ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; done ) This is actually the shortened version; the real one I'm running, which just adds some progress-reporting and a clean stop when we run out of files to delete, is: export i=0; time ( while [ true ]; do ls -Uf | head -n 3 | grep -qF '.png' || break; ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; export i=$(($i+10000)); echo "$i..."; done ) This seems to be working rather well. As I write this, it's deleted 260,000 files in the past thirty minutes or so. Now, for the questions: As mentioned above, is the per-directory entry limit tunable? Why did it take "real 7m9.561s / user 0m0.001s / sys 0m0.001s" to delete a single file which was the first one in the list returned by "ls -U", and it took perhaps ten minutes to delete the first 10,000 entries with the command in #3, but now it's hauling along quite happily? For that matter, it deleted 260,000 in about thirty minutes, but it's now taken another fifteen minutes to delete 60,000 more. Why the huge swings in speed? Is there a better way to do this sort of thing? Not store millions of files in a directory; I know that's silly, and it wouldn't have happened on my watch. Googling the problem and looking through SF and SO offers a lot of variations on "find" that obviously have the wrong idea; it's not going to be faster than my approach for several self-evident reasons. But does the delete-via-fsck idea have any legs? Or something else entirely? I'm eager to hear out-of-the-box (or inside-the-not-well-known-box) thinking. Thanks for reading the small novel; feel free to ask questions and I'll be sure to respond. I'll also update the question with the final number of files and how long the delete script ran once I have that. Final script output!: 2970000... 2980000... 2990000... 3000000... 3010000... real 253m59.331s user 0m6.061s sys 5m4.019s So, three million files deleted in a bit over four hours.

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  • Permission denied message when starting gfs2

    - by sashang
    Can anyone please explain why I get this permission denied error? I try starting the script and it fails with a permission denied message. So I create a copy of it and run that instead and that works. [root@node2 ~]# /etc/init.d/gfs2 stop Unmounting GFS2 filesystem (/drbd): [ OK ] [root@node2 ~]# /etc/init.d/gfs2 start Mounting GFS2 filesystem (/drbd): gfs_controld join connect error: Permission denied error mounting lockproto lock_dlm [FAILED] [root@node2 ~]# cp /etc/init.d/gfs2 /etc/init.d/gfs2_test [root@node2 ~]# /etc/init.d/gfs2_test start Mounting GFS2 filesystem (/drbd): [ OK ] [root@node2 ~]# [root@node2 ~]# ls -l /etc/init.d/gfs2* -rwxr-xr-x. 1 root root 3365 Jan 15 12:11 /etc/init.d/gfs2 -rwxr-xr-x. 1 root root 3365 Jan 15 12:19 /etc/init.d/gfs2_test [root@node2 ~]#

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  • Why do some programmers think there is a contrast between theory and practice?

    - by Giorgio
    Comparing software engineering with civil engineering, I was surprised to observe a different way of thinking: any civil engineer knows that if you want to build a small hut in the garden you can just get the materials and go build it whereas if you want to build a 10-storey house you need to do quite some maths to be sure that it won't fall apart. In contrast, speaking with some programmers or reading blogs or forums I often find a wide-spread opinion that can be formulated more or less as follows: theory and formal methods are for mathematicians / scientists while programming is more about getting things done. What is normally implied here is that programming is something very practical and that even though formal methods, mathematics, algorithm theory, clean / coherent programming languages, etc, may be interesting topics, they are often not needed if all one wants is to get things done. According to my experience, I would say that while you do not need much theory to put together a 100-line script (the hut), in order to develop a complex application (the 10-storey building) you need a structured design, well-defined methods, a good programming language, good text books where you can look up algorithms, etc. So IMO (the right amount of) theory is one of the tools for getting things done. So my question is why do some programmers think that there is a contrast between theory (formal methods) and practice (getting things done)? Is software engineering (building software) perceived by many as easy compared to, say, civil engineering (building houses)? Or are these two disciplines really different (apart from mission-critical software, software failure is much more acceptable than building failure)?

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  • how to limit disk space per user in a PHP web application & CentOS

    - by solid
    we have a web application written in PHP and we want all our users to be able to upload images for e.g. 50MB. We will create a directory structure so that every user has its own folder like app/user1/images app/user2/images ... Now everytime a user uploads an image, we need to check if this is still allowed or not but we don't want 1000 users to continously scan our hard drive counting file sizes in their directory. So writing a script that counts all file sizes in a user directory is not an option I guess? Is there an easier way to calculate used up space per user and limit our app accordingly?

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  • Copying files within a Workgroup

    - by Andrew La Grange
    I have three boxes operating in a Windows Server workgroup within a closed network. (No Domain / No AD) There are several derivations of the scenario that I'm about to outline, but I'm sure I will be able to retool the solution as and when I need. Essentially the boxes are: 2 x Windows Server 2008 R2 x64 Standard 1 x Windows Server 2000 Standard I need to be able to schedule the copying/and-or/moving of files from various directories and each of the boxes. Each box has a different username and password for the administrator. I have PowerShell 2.0 on the two Win2K8 boxes (obviously). Previously I have used mapped network drives to copy the files, and cmd line batches, but I'd much rather use Powershell if possible (with Shares and/or $ notation). However the Copy-Item cmdlet doesn't seem to be processing the Credential correctly. Perhaps some Powershell gurus out there might be able to help me. Essentially I'd like to schedule a PS run of script to push backup files onto my WIn2k box (old fileserver) periodically.

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  • How to subscribe to a youtube feed from linux command line?

    - by Tim
    I want to subscribe to a youtube channel and automatically download new videos to my linux machine. I know I could do this e.g. with miro, but I will not watch the videos using Miro, want to choose the quality and would like to run it as a cronjob. It should be able to: know which feed entries are new and not download old entries resume (or at least redownload) failed/incomplete downloads from older sessions Are there any complete solutions for this? If not it would be enough for me (maybe even preferable) to just have a command line rss reader that remembers which entries have already been there and writes the new video urls (e.g. http://www.youtube.com/watch?v=FodYFMaI4vQ&feature=youtube_gdata from http://gdata.youtube.com/feeds/api/users/tedxtalks/uploads) into a file. I could then accomplish the rest using a bash script and youtube-dl. What would be programs usable for this purpose?

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  • Use inotifywait and lftp to synchronize servers

    - by KBoek
    I have two servers: Server A (CentOS), where people can upload files to (upload root is /files) Server B (Win 2008), with FileZilla FTP Server (FTP root is C:\content) I want that whenever a file is uploaded to Server A, to any subfolder under /files, the file is automatically copied to the exact same subfolder on Server B. Thus, if a user uploads "flowers.jpg" to /files/photos/12345/ then the file must be copied over FTP to C:\content\photos\12345 So far I have this bash script, it does copy the files to server B, but all files are placed in C:\content, and not in the corresponding subfolders. Who can help me find the correct syntax? #!/bin/bash cd /files inotifywait -q -r -m -e close_write,moved_to . --format %w%f | while read FILE; do lftp -e "put $FILE; exit" -u user,password -p 2121 ftp.server-a.com done

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  • I want to build a Virtual Machine, are there any good references?

    - by Michael Stum
    I'm looking to build a Virtual Machine as a platform independent way to run some game code (essentially scripting). The Virtual Machines that I'm aware of in games are rather old: Infocom's Z-Machine, LucasArts' SCUMM, id Software's Quake 3. As a .net Developer, I'm familiar with the CLR and looked into the CIL Instructions to get an overview of what you actually implement on a VM Level (vs. the language level). I've also dabbled a bit in 6502 Assembler during the last year. The thing is, now that I want¹ to implement one, I need to dig a bit deeper. I know that there are stack based and register based VMs, but I don't really know which one is better at what and if there are more or hybrid approaches. I need to deal with memory management, decide which low level types are part of the VM and need to understand why stuff like ldstr works the way it does. My only reference book (apart from the Z-Machine stuff) is the CLI Annotated Standard, but I wonder if there is a better, more general/fundamental lecture for VMs? Basically something like the Dragon Book, but for VMs? I'm aware of Donald Knuth's Art of Computer Programming which uses a register-based VM, but I'm not sure how applicable that series still is, especially since it's still unfinished? Clarification: The goal is to build a specialized VM. For example, Infocom's Z-Machine contains OpCodes for setting the Background Color or playing a sound. So I need to figure out how much goes into the VM as OpCodes vs. the compiler that takes a script (language TBD) and generates the bytecode from it, but for that I need to understand what I'm really doing. ¹ I know, modern technology would allow me to just interpret a high level scripting language on the fly. But where is the fun in that? :) It's also a bit hard to google because Virtual Machines is nowadays often associated with VMWare-type OS Virtualization...

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  • Netbook performs hard shutdown without warning on low battery power

    - by Steve Kroon
    My Asus EEE netbook performs a hard shutdown when it reaches low battery power, without giving any warning - i.e. the power just goes off, without any shutdown process. I can't find anything in the syslog, and no error messages are printed before it happens. I've had this problem on previous (K)Ubuntu versions, and hoped updating to Ubuntu Precise would help resolve the issue, but it hasn't. The option in the Power application for "when power is critically low" is currently blank - the only options are a (grayed-out) hibernate and "Power off". I have re-installed indicator-power to no effect. The time remaining reported by acpi is unstable, as is the time remaining reported by gnome-power-statistics. (For example, running acpi twice in succession, I got 2h16min, and then 3h21min remaining. These sorts of jumps in the remaining time are also in the gnome-power-statistics graphs.) It might be possible to write a script to give me advance warning (as per @RanRag's comment below), but I would prefer to isolate why I don't get a critical battery notification from the system before this happens, so that I can take action as appropriate (suspend/shutdown/plug in power) when I get a notification. Some additional information on the battery: kroon@minia:~$ upower -i /org/freedesktop/UPower/devices/battery_BAT0 native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/PNP0C0A:00/power_supply/BAT0 vendor: ASUS model: 1005P power supply: yes updated: Fri Aug 17 07:31:23 2012 (9 seconds ago) has history: yes has statistics: yes battery present: yes rechargeable: yes state: charging energy: 33.966 Wh energy-empty: 0 Wh energy-full: 34.9272 Wh energy-full-design: 47.52 Wh energy-rate: 3.7692 W voltage: 12.61 V time to full: 15.3 minutes percentage: 97.248% capacity: 73.5% technology: lithium-ion History (charge): 1345181483 97.248 charging 1345181453 97.155 charging 1345181423 97.062 charging 1345181393 96.970 charging History (rate): 1345181483 3.769 charging 1345181453 3.899 charging 1345181423 4.061 charging 1345181393 4.201 charging kroon@minia:~$ cat /proc/acpi/battery/BAT0/state present: yes capacity state: ok charging state: charging present rate: 332 mA remaining capacity: 3149 mAh present voltage: 12612 mV kroon@minia:~$ cat /proc/acpi/battery/BAT0/info present: yes design capacity: 4400 mAh last full capacity: 3209 mAh battery technology: rechargeable design voltage: 10800 mV design capacity warning: 10 mAh design capacity low: 5 mAh cycle count: 0 capacity granularity 1: 44 mAh capacity granularity 2: 44 mAh model number: 1005P serial number: battery type: LION OEM info: ASUS

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