execute - Page 48 - Developer IT

Recovery: "Scripting Oracle RMAN Commands"

Learn how to create and automate scripts to execute common recovery tasks.

How to find a Window which should be visible on Ubuntu 14.04

In Ubuntu 14.04 I have Keepass2 in my Launchbar. I do execute Keepass and I can see it is executing by a small arrow. With statement : ps - fu bernard | grep keepass2 Also with alt-tab I see Keepass. If I click on the Keepass icon still I am not switched to Keepass. The same happened to me with XAMPP from https://www.apachefriends.org so it seems a general Ubuntu 14.04 problem I execute this in Virtualbox client. If I switch sometimes to other VB client, when I come back the Windows is visible.

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Avoid if statements in DirectX 10 shaders?

- by PolGraphic

I have heard that if statements should be avoid in shaders, because both parts of the statements will be execute, and than the wrong will be dropped (which harms the performance). It's still a problem in DirectX 10? Somebody told me, that in it only the right branch will be execute. For the illustration I have the code: float y1 = 5; float y2 = 6; float b1 = 2; float b2 = 3; if(x>0.5){ x = 10 * y1 + b1; }else{ x = 10 * y2 + b2; } Is there an other way to make it faster? If so, how do it? Both branches looks similar, the only difference is the values of "constants" (y1, y2, b1, b2 are the same for all pixels in Pixel Shader).

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Combining Multiple Queries and Parameters into One Operation

- by shay.shmeltzer

This question came up twice this week and while the solution is explained in a couple of previous blog entries I did, I thought that showing off the complete solution in a single video would be nice. The scenario is that you have two VOs with queries that are based on a parameter, I showed in the past how to create a parameter form that executes the query - and you can do this for both. But what if you actually need just one value to drive both queries? How do you combine two parameter forms and two buttons into one? This is what this video shows you. The steps are: Creating two parameter forms Setting the value of a parameter in the binding tab Creating a backing bean to execute the code for one button Adding the code to execute another operation Remarking the parts that can be dropped from the screen Check it out here:

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Create shortcut for PHP

- by Daniel

I have XAMPP installed and my PHP is: /opt/lampp/bin/php-5.3.8 Every time I need to execute a PHP file I need to do this: /opt/lampp/bin/php-5.3.8 testando.php Is there another way to execute it besides using symbolic link? I did this on /etc/init.d/: sudo ln -s /opt/lampp/bin/php-5.3.8 php Why when I need to run PHP I have to do this ./php instead of just php? And is there a way to do this without the ./? Like it was installed via apt-get?

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Nagios suddenly stops working

- by pankaj sharma

I have configure passive checks on one my host system for this i am using nsca. it was running fine. suddenly host is showing down on the monitoring. but host was fine and running when i check the logs on the host showing [1347941895] Warning: Attempting to execute the command "/submit_check_result host.example.com 'Current Load' OK 'OK - load average: 0.69, 0.53, 0.42'" resulted in a return code of 127. Make sure the script or binary you are trying to execute actually exists... i restarted nagios services many times but still it is showing the same error. can anyone help me regarding this. thanks in advance..

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Problems creating a debdiff

- by Chris Wilson

I'm following this guide to create a debdiff for a package I'm patching. Everything goes fine until step number 8 and I attempt to create the debdiff after committing the changes. The package in question is Zim, pulled form Launchpad using bzr branch lp:zim and according to this guide I should execute the following command to create the debdiff: debdiff zim_0.49.dsc zim_0.49ubuntu1.dsc > zim_0.49ubuntu1.debdiff however, when I actually try to execute this command, I get the following error: debdiff: fatal error at line 314: Can't read file: zim_0.49.dsc Upon inspection of the directory in which the files created from debuild -S (step 6) are deposited, I find zim_0.49ubuntu1_source.changes zim_0.49ubuntu1.dsc zim_0.49ubuntu1.tar.gz zim_0.49ubuntu1_source.build but no sign of zim_0.49.dsc. I could probably create one by debuilding the package as soon as I check out the code, before starting work, but that would add an extraneous entry in the changelog. Is there a step missing from the guide that creates zim_0.49.dsc or is the file itself missing from the source?

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Why do I have man pages of commands that don't exist?

- by Robert Vila

What is panel-test-applets for?? I don't know. But if I want to know I type: $ whatis panel-test-applets The answer is: panel-test-applets (1) - display installed applets I have the man page too, and I can read it: $ man panel-test-applets But there is no program with that name. Maybe the command is not very useful, but is its man page more useful? Does someone know how to install that program or what is its man page for when you cannot execute the program? I can't even execute the command: $ panel-test-applets nor $ panel-test-applets --help which is the only thing its man page talks about!!

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Default file manager changed, can't change back

- by user16171

(Using ubuntu 11.04) I tried to open a torrent file in chrome, and it asked for my default application, so I clicked Transmission, and then I got an error: "Failed to execute default file manager, Failed to execute child process "transmission" (No such file or directory)." Now if I click on any shortcut on the unity bar, such as the trash folder or the icon for my portable hard drive, I get this error, as well as with any download or folder from chrome or firefox. I can't seem to figure out how to fix this, as there seems to be no easy way to do it.

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.NET Security Part 4

- by Simon Cooper

Finally, in this series, I am going to cover some of the security issues that can trip you up when using sandboxed appdomains. DISCLAIMER: I am not a security expert, and this is by no means an exhaustive list. If you actually are writing security-critical code, then get a proper security audit of your code by a professional. The examples below are just illustrations of the sort of things that can go wrong. 1. AppDomainSetup.ApplicationBase The most obvious one is the issue covered in the MSDN documentation on creating a sandbox, in step 3 – the sandboxed appdomain has the same ApplicationBase as the controlling appdomain. So let’s explore what happens when they are the same, and an exception is thrown. In the sandboxed assembly, Sandboxed.dll (IPlugin is an interface in a partially-trusted assembly, with a single MethodToDoThings on it): public class UntrustedPlugin : MarshalByRefObject, IPlugin { // implements IPlugin.MethodToDoThings() public void MethodToDoThings() { throw new EvilException(); } } [Serializable] internal class EvilException : Exception { public override string ToString() { // show we have read access to C:\Windows // read the first 5 directories Console.WriteLine("Pwned! Mwuahahah!"); foreach (var d in Directory.EnumerateDirectories(@"C:\Windows").Take(5)) { Console.WriteLine(d.FullName); } return base.ToString(); } } And in the controlling assembly: // what can possibly go wrong? AppDomainSetup appDomainSetup = new AppDomainSetup { ApplicationBase = AppDomain.CurrentDomain.SetupInformation.ApplicationBase } // only grant permissions to execute // and to read the application base, nothing else PermissionSet restrictedPerms = new PermissionSet(PermissionState.None); restrictedPerms.AddPermission( new SecurityPermission(SecurityPermissionFlag.Execution)); restrictedPerms.AddPermission( new FileIOPermission(FileIOPermissionAccess.Read, appDomainSetup.ApplicationBase); restrictedPerms.AddPermission( new FileIOPermission(FileIOPermissionAccess.pathDiscovery, appDomainSetup.ApplicationBase); // create the sandbox AppDomain sandbox = AppDomain.CreateDomain("Sandbox", null, appDomainSetup, restrictedPerms); // execute UntrustedPlugin in the sandbox // don't crash the application if the sandbox throws an exception IPlugin o = (IPlugin)sandbox.CreateInstanceFromAndUnwrap("Sandboxed.dll", "UntrustedPlugin"); try { o.MethodToDoThings() } catch (Exception e) { Console.WriteLine(e.ToString()); } And the result? Oops. We’ve allowed a class that should be sandboxed to execute code with fully-trusted permissions! How did this happen? Well, the key is the exact meaning of the ApplicationBase property: The application base directory is where the assembly manager begins probing for assemblies. When EvilException is thrown, it propagates from the sandboxed appdomain into the controlling assembly’s appdomain (as it’s marked as Serializable). When the exception is deserialized, the CLR finds and loads the sandboxed dll into the fully-trusted appdomain. Since the controlling appdomain’s ApplicationBase directory contains the sandboxed assembly, the CLR finds and loads the assembly into a full-trust appdomain, and the evil code is executed. So the problem isn’t exactly that the sandboxed appdomain’s ApplicationBase is the same as the controlling appdomain’s, it’s that the sandboxed dll was in such a place that the controlling appdomain could find it as part of the standard assembly resolution mechanism. The sandbox then forced the assembly to load in the controlling appdomain by throwing a serializable exception that propagated outside the sandbox. The easiest fix for this is to keep the sandbox ApplicationBase well away from the ApplicationBase of the controlling appdomain, and don’t allow the sandbox permissions to access the controlling appdomain’s ApplicationBase directory. If you do this, then the sandboxed assembly can’t be accidentally loaded into the fully-trusted appdomain, and the code can’t be executed. If the plugin does try to induce the controlling appdomain to load an assembly it shouldn’t, a SerializationException will be thrown when it tries to load the assembly to deserialize the exception, and no damage will be done. 2. Loading the sandboxed dll into the application appdomain As an extension of the previous point, you shouldn’t directly reference types or methods in the sandboxed dll from your application code. That loads the assembly into the fully-trusted appdomain, and from there code in the assembly could be executed. Instead, pull out methods you want the sandboxed dll to have into an interface or class in a partially-trusted assembly you control, and execute methods via that instead (similar to the example above with the IPlugin interface). If you need to have a look at the assembly before executing it in the sandbox, either examine the assembly using reflection from within the sandbox, or load the assembly into the Reflection-only context in the application’s appdomain. The code in assemblies in the reflection-only context can’t be executed, it can only be reflected upon, thus protecting your appdomain from malicious code. 3. Incorrectly asserting permissions You should only assert permissions when you are absolutely sure they’re safe. For example, this method allows a caller read-access to any file they call this method with, including your documents, any network shares, the C:\Windows directory, etc: [SecuritySafeCritical] public static string GetFileText(string filePath) { new FileIOPermission(FileIOPermissionAccess.Read, filePath).Assert(); return File.ReadAllText(filePath); } Be careful when asserting permissions, and ensure you’re not providing a loophole sandboxed dlls can use to gain access to things they shouldn’t be able to. Conclusion Hopefully, that’s given you an idea of some of the ways it’s possible to get past the .NET security system. As I said before, this post is not exhaustive, and you certainly shouldn’t base any security-critical applications on the contents of this blog post. What this series should help with is understanding the possibilities of the security system, and what all the security attributes and classes mean and what they are used for, if you were to use the security system in the future.

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Install unetbootin on Ubuntu 12.04

- by Matteo

I'm trying to install UNetbootin on Ubuntu 12.04 LTS. I downloaded the executable file from this link and followed the instructions below: If using Linux, make the file executable (using either the command chmod +x ./unetbootin-linux, or going to Properties-Permissions and checking "Execute"), then start the application, you will be prompted for your password to grant the application administrative rights, then the main dialog will appear, where you select a distribution and install target (USB Drive or Hard Disk), then reboot when prompted.\ So I typed on my terminal sudo chmod +x unetbootin-linux-584 and tried to execute the binary file with ./unetbootin-linux-584 but got this output: ./unetbootin-linux-584: error while loading shared libraries: libXrandr.so.2: cannot open shared object file: No such file or directory However when I checked for libraries libXrandr on my system I actually found them $> locate libXrandr /usr/lib/x86_64-linux-gnu/libXrandr.so.2 /usr/lib/x86_64-linux-gnu/libXrandr.so.2.2.0 /usr/lib/x86_64-linux-gnu/libXrandr_ltsq.so.2 /usr/lib/x86_64-linux-gnu/libXrandr_ltsq.so.2.2.0 so I really don't have a clue of what's the problem and how can I fix it, any ideas?

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Is true multithreading really necessary?

- by Jonathan Graef

So yeah, I'm creating a programming language. And the language allows multiple threads. But, all threads are synchronized with a global interpreter lock, which means only one thread is allowed to execute at a time. The only way to get the threads to switch off is to explicitly tell the current thread to wait, which allows another thread to execute. Parallel processing is of course possible by spawning multiple processes, but the variables and objects in one process cannot be accessed from another. However the language does have a fairly efficient IPC interface for communicating between processes. My question is: Would there ever be a reason to have multiple, unsynchronized threads within a single process (thus circumventing the GIL)? Why not just put thread.wait() statements in key positions in the program logic (presuming thread.wait() isn't a CPU hog, of course)? I understand that certain other languages that use a GIL have processor scheduling issues (cough Python), but they have all been resolved.

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Update from Ola Hallengren: Target multiple devices during SQL Server backup

- by Greg Low

Ola has produced another update of his database management scripts. If you haven't taken a look at them, you should. At the very least, they'll give you good ideas about what to implement and how others have done so. The latest update allows targeting multiple devices during backup. This is available in native SQL Server backup and can be helpful with very large databases. Ola's scripts now support it as well.Details are here: http://ola.hallengren.com/sql-server-backup.html http://ola.hallengren.com/versions.html The following example shows it backing up to 4 files on 4 drives, one file on each drive:EXECUTE dbo.DatabaseBackup@Databases = 'USER_DATABASES',@Directory = 'C:\Backup, D:\Backup, E:\Backup, F:\Backup',@BackupType = 'FULL',@Compress = 'Y',@NumberOfFiles = 4And this example shows backing up to 16 files on 4 drives, 4 files on each drive: EXECUTE dbo.DatabaseBackup@Databases = 'USER_DATABASES',@Directory = 'C:\Backup, D:\Backup, E:\Backup, F:\Backup',@BackupType = 'FULL',@Compress = 'Y',@NumberOfFiles = 16Ola mentioned that you can now back up to up to 64 drives.

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Setup CRON weekly backup

- by sadmicrowave

I want to make a backup of my /var/lib/mysql and /var/www folders and save them as tar.gz files to my mounted network file server (uslons001). Here is my bash file located in: /etc/cron.weekly/mysqlbackup.sh #!/bin/bash mkdir ~/uslons001/`date +%d%m%y` tar -czf ~/uslons001/`date +%d%m%y`/mysql.tar.gz /var/lib/mysql tar -czf ~/uslons001/`date +%d%m%y`/www.tar.gz /var/www tar -czf ~/uslons001/`date +%d%m%y`.tar.gz ~/uslons001/`date +%d%m%y` echo Backup Completed `date` >> ~/backuplog Which works PERFECTLY fine when I execute it in a cmd shell but when I setup the cron job it never runs, so I'm not setting the cron job up properly. My cron job looks like this. 30 7 * * fri /etc/cron.weekly/mysqlbackup.sh Which should execute at 7:30AM every Friday... What am I doing wrong? UPDATE1 - change the cron job line to the following: 44 8 * * 5 /etc/cron.weekly/mysqlbackup.sh with still no luck...is there a cron error log file that I can read to help pin point where the problem is?

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Database Rebuild

- by Robert May

I promised I’d have a simpler mechanism for rebuilding the database. Below is a complete MSBuild targets file for rebuilding the database from scratch. I don’t know if I’ve explained the rational for this. The reason why you’d WANT to do this is so that each developer has a clean version of the database on their local machine. This also includes the continuous integration environment. Basically, you can do whatever you want to the database without fear, and in a minute or two, have a completely rebuilt database structure. DBDeploy (including the KTSC build task for dbdeploy) is used in this script to do change tracking on the database itself. The MSBuild ExtensionPack is used in this target file. You can get an MSBuild DBDeploy task here. There are two database scripts that you’ll see below. First is the task for creating an admin (dbo) user in the system. This script looks like the following: USE [master] GO If not Exists (select Name from sys.sql_logins where name = '$(User)') BEGIN CREATE LOGIN [$(User)] WITH PASSWORD=N'$(Password)', DEFAULT_DATABASE=[$(DatabaseName)], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF END GO EXEC master..sp_addsrvrolemember @loginame = N'$(User)', @rolename = N'sysadmin' GO USE [$(DatabaseName)] GO CREATE USER [$(User)] FOR LOGIN [$(User)] GO ALTER USER [$(User)] WITH DEFAULT_SCHEMA=[dbo] GO EXEC sp_addrolemember N'db_owner', N'$(User)' GO The second creates the changelog table. This script can also be found in the dbdeploy.net install\scripts directory. CREATE TABLE changelog ( change_number INTEGER NOT NULL, delta_set VARCHAR(10) NOT NULL, start_dt DATETIME NOT NULL, complete_dt DATETIME NULL, applied_by VARCHAR(100) NOT NULL, description VARCHAR(500) NOT NULL ) GO ALTER TABLE changelog ADD CONSTRAINT Pkchangelog PRIMARY KEY (change_number, delta_set) GO Finally, Here’s the targets file. <Projectxmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0" DefaultTargets="Update"> <PropertyGroup> <DatabaseName>TestDatabase</DatabaseName> <Server>localhost</Server> <ScriptDirectory>.\Scripts</ScriptDirectory> <RebuildDirectory>.\Rebuild</RebuildDirectory> <TestDataDirectory>.\TestData</TestDataDirectory> <DbDeploy>.\DBDeploy</DbDeploy> <User>TestUser</User> <Password>TestPassword</Password> <BCP>bcp</BCP> <BCPOptions>-S$(Server) -U$(User) -P$(Password) -N -E -k</BCPOptions> <OutputFileName>dbDeploy-output.sql</OutputFileName> <UndoFileName>dbDeploy-output-undo.sql</UndoFileName> <LastChangeToApply>99999</LastChangeToApply> </PropertyGroup> <ImportProject="$(MSBuildExtensionsPath)\ExtensionPack\4.0\MSBuild.ExtensionPack.tasks"/> <UsingTask TaskName="Ktsc.Build.DBDeploy" AssemblyFile="$(DbDeploy)\Ktsc.Build.dll"/> <ItemGroup> <VariableInclude="DatabaseName"> <Value>$(DatabaseName)</Value> </Variable> <VariableInclude="Server"> <Value>$(Server)</Value> </Variable> <VariableInclude="User"> <Value>$(User)</Value> </Variable> <VariableInclude="Password"> <Value>$(Password)</Value> </Variable> </ItemGroup> <TargetName="Rebuild">  <MSBuild.ExtensionPack.SqlServer.SqlCmd Variables="@(Variable)" Database="$(DatabaseName)" TaskAction="Execute" CommandLineQuery ="ALTER DATABASE $(DatabaseName) SET OFFLINE WITH ROLLBACK IMMEDIATE"/>  <MSBuild.ExtensionPack.Sql2008.DatabaseTaskAction="SetOnline" DatabaseItem="$(DatabaseName)"/>  <MSBuild.ExtensionPack.Sql2008.DatabaseTaskAction="Delete" DatabaseItem="$(DatabaseName)"/>  <MSBuild.ExtensionPack.Sql2008.DatabaseTaskAction="Create" DatabaseItem="$(DatabaseName)" Force="True"/>  <MSBuild.ExtensionPack.SqlServer.SqlCmd TaskAction="Execute" Server="(local)" Database="$(DatabaseName)" InputFiles="$(RebuildDirectory)\0002 Create Admin User.sql" Variables="@(Variable)" />  <MSBuild.ExtensionPack.SqlServer.SqlCmd TaskAction="Execute" Server="(local)" Database="$(DatabaseName)" LogOn="$(User)" Password="$(Password)" InputFiles="$(RebuildDirectory)\0003 Create Changelog.sql" Variables="@(Variable)" /> <CallTarget Targets="Update;ImportData"/> </Target> <TargetName="Update" DependsOnTargets="CreateUpdateScript"> <MSBuild.ExtensionPack.SqlServer.SqlCmd TaskAction="Execute" Server="(local)" Database="$(DatabaseName)" LogOn="$(User)" Password="$(Password)" InputFiles="$(OutputFileName)" Variables="@(Variable)" /> </Target> <TargetName="CreateUpdateScript"> <ktsc.Build.DBDeploy DbType="mssql" DbConnection="User=$(User);Password=$(Password);Data Source=$(Server);Initial Catalog=$(DatabaseName);" Dir="$(ScriptDirectory)" OutputFile="..\$(OutputFileName)" UndoOutputFile="..\$(UndoFileName)" LastChangeToApply="$(LastChangeToApply)"/> </Target> <TargetName="ImportData"> <ItemGroup> <TestData Include="$(TestDataDirectory)\*.dat"/> </ItemGroup> <ExecCommand="$(BCP) $(DatabaseName).dbo.%(TestData.Filename) in"%(TestData.Identity)"$(BCPOptions)"/> </Target> </Project> Technorati Tags: MSBuild

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Remote connection problem.

- by Woody

Hello I have ubuntu 10.04 installed with mysql on it and I have a problem with remote connection. When I connect through putty it works but sometimes it looks like it hangs for example when I execute the command ln --help. Also with MySQL connection When I execute a simple query like show processlist; it works, but for example select * from table not always, if the table doesn't have many rows it works but if it has let's say more than 20 the query looks like it keeps working and never ends. It's connected but I can't do many things remotely. Added: I connect using putty from other windows pc, server is not overloaded. when i work at the same time directly on ubuntu i can do everything. Remotely not.

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Why is this by passing the SUDO password?

- by John Isaacks

I have a bash script I am using to automate a SVN checkout. The contents of the file were: #!/bin/bash cd /var/www-cake sudo svn checkout file:///usr/local/svn/bash_repo/repo/ Then when I double click the file it would ask me what to do, I would click the button "Run In Terminal" and then a terminal would pop up and ask me for the SUDO password. I would enter it, the script would execute and the terminal would close. I wanted to give some sort of indication that the script ran successfully so I edited my file to look like: #!/bin/bash cd /var/www-cake sudo svn checkout file:///usr/local/svn/bash_repo/repo/ echo "Head revision has been pushed to live server" I expected the terminal to now stay open and tell me the message afterwards. To my surprise it now opens and immediately closes. The script does execute and I no longer have to put in the SUDO password. Is this right? I do not understand why this is happening, seems like a security issue.

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Reasons why crontab does not work

- by Adam Matan

Many a time and oft, crontab scripts are not executed as expected. There are numerous reasons for that, for example: wrong crontab notation, permissions, environment variables and many more. This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer. Please include one reason per answer - details about why it's not executed - and fix(es) for that one reason. Please write only cron-specific issues, e.g. commands that execute as expected from the shell but execute erroneously by cron.

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Entity Framework: Connecting to a mdf user database file via localDB during script execution

- by Marko Apfel

Problem If you run the “Generate database from model” wizard and execute the generated script the destination database could be the wrong one (for instance master of the SQL Server). Solution To use an own mdf attachable user database some connection information must specified during script execution. Execute your script opens the dialog “Connect to Server”. Press “Options” and go to the second tab “Connection Properties”. Select “Browse server” in the “Connect to database” dropdown box: Confirm the information dialog with “Yes”. In the following dialog you could choose your user database. Now the schema is created in the user database.

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Reasons why crontab does not work

- by Adam Matan

Many a time and oft, crontab scripts are not executed as expected. There are numerous reasons for that, for example: wrong crontab notation, permissions, environment variables and many more. This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer. Please include one reason per answer - details about why it's not executed - and fix(es) for that one reason. Please write only cron-specific issues, e.g. commands that execute as expected from the shell but execute erroneously by cron.

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Where is the start up file located?

- by starcorn

Hello, I want to add some lines which should execute every time Ubuntu boots up, so I don't have to change them manually everytime. I've read in some place that you should edit this file /etc/rc.local. However when I add the lines I want to execute at start up it doesn't run those lines. So I wonder where the start up file is located in ubuntu? Those lines I want to add is to change the sensitivity for the trackpoint One of the lines I want to add: echo -n 250 > /sys/devices/platform/i8042/serio1/serio2/sensitivity

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Is there a difference between multi-tasking and time-sharing?

- by Dummy Derp

Just going over my school notes, my teacher identifies multi-tasking OS, and time-sharing OS as two different things. I really don't see a difference between the two. MULTI-TASKING: You load a number of programs in the memory and execute them. You execute another program if the time quantum allocated to the current program expires OR if it goes on to do I/O and leaves the CPU OR if it finishes execution. TIME-SHARING: the same,again. The same applies in case of serial processing and batch processing. Although they are the same, I guess the only difference would be the way in which control information is passed to the CPU. Maybe, and again MAYBE, in serial processing you need to provide the punch cards with all the processes while in batch, the entire batch uses the same set of control information. Like all the print jobs would have the same control information.

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Web Page Execution Internals

- by octopusgrabbus

My question is what is the subject area that covers web page execution/loading. I am looking to purchase a book by subject area that covers when things execute or load in a web page, whether it's straight html, html and Javascript, or a PHP page. Is that topic covered by a detailed html book, or should I expect to find information like that in a JavaScript of PHP book? I understand that PHP and Perl execute on the server and that Javascript is client side, and I know there is a lot of on-line documentation describing <html>, <head>, <body>, and so on. I'm just wondering what subject area a book would be in to cover all that, not a discussion of the best book or someone's favorite book, but the subject area.

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Intercepting the Unity logout

- by qbi

I want to copy some data from another machine to a local computer on a regular basis. At the moment I'm researching different solutions and try to find the one which fits best. Basically I want to open a network connection (or use an existing one), make a VPN connection and start a rsync process. This should be done on every logout of my desktop session or on shutdown. One possible solution might be to somehow intercept the Unity shutdown and execute a script. So is there a possibility to execute a script on GNOME/Unity shutdown? I'm aware that you can do it on system shutdown. How can I do this?

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Multicast in Ubuntu

- by iwant2learn

Can some one please explain the steps required to configure a multicast in Ubuntu? I have a simple program taken from Internet. I get errors when I execute the client program. I get the error as: Opening datagram socket....OK. Setting SO_REUSEADDR...OK. Binding datagram socket...OK. Adding multicast group error: No such device: When I execute the server program I get the error as: Opening the datagram socket...OK. Setting local interface error: Cannot assign requested address I am using Ubuntu to run the program. I have two different laptops but connected via the same network. I am using wireless network to perform the above operation.

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