Unixmen

How to rename or change user name in Linux

pirat9 — Mon, 14 Jan 2013 21:40:36 +0000

Question : How to rename or change user name in Linux?

Answer:

killall -u old
id old
usermod -l new old
groupmod -n new old
usermod -d /home/new -m new
usermod -c “New Real Name” new
id new

Example:

kill -u pirat9

 #id pirat9
uid=1000(pirat9) gid=1000(pirat9) groups=1000(pirat9),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),109(lpadmin),127(sambashare)

# id blanco
uid=1001(blanco) gid=1001(blanco) groups=1001(blanco)
pirat9@pirat9 ~ $

usermod -l  blanco pirat9

groupmod -n blanco pirat9

usermod -d /home/blanco -m  blanco

usermod -c "James Bond" blanco

id blanco

Done

--------------------------------------------------------------------- How to rename or change user name in Linux

Options for Linux Gamers

Chris Jones — Mon, 14 Jan 2013 20:49:46 +0000

During the holiday season, we all tend to drop our usual work tasks and take some time out and spend more time gaming. I am guilty of this and have well and truly caught up on lost gaming time over the past couple of weeks.

And I hope you have too. Now is an exciting time for Linux and gaming as we are currently in the middle of a transition of traditional native gaming to a format of several different types. Where will the future of gaming go? And more importantly, what will it mean for Linux gamers? Currently, there are several different paths that have forked from the traditional method of installing games on to the operating system. Let’s examine what options we currently have and what could possibly be around the corner.

Native

Native gaming is also known as traditional gaming, due to it being the original method of gaming delivery. Traditionally, a game would be purchased from a gaming store or an online store. Then the installation media would be shipped out to the gamer who made the original purchase. Typically, this would be DVD-ROM or CD-ROM optical media. Or going back to the earlier days of gaming, installation media would have probably arrived on floppy disks or multiples of floppy disks. Once the media was received, the gamer would then install the game on the operating system it was developed for. And that would most likely be Microsoft Windows. The traditional form of game media delivery probably still remains the most popular delivery method to the consumer today, but it’s under threat from more modern and efficient forms of delivery which we’ll take a look at in a minute. Opinions from gamers on the traditional form of game media delivery is split. Traditionalists prefer having a boxed media because it adds to their growing collection of games already obtained over the course of many years of serious gaming. Yet many of the younger generation of gamers see no reason to have packaged installation media sitting around when a game installer can be downloaded from the internet and installed.

Steam

Many traditional and hardcore gamers believe that Steam could be the potential savior of making true native Linux gaming viable. Steam has been around for a long time, but has previously been developed for Windows only. A Steam client for Linux has been rumored for quite some time, but only recently has it been officially released under the “Beta” tag, for Linux. Although the client is still under heavy development, initial reviews of gaming performance under Linux have been promising. For client-side delivery on Linux to truly succeed as a platform for game media delivery, it needs more support from many different game developers and publishers across the industry and can not solely rely on one technology for its delivery, Steam. I am declaring that Steam is bad and not doing great things, I am simply pointing out Linux gamers can not solely rely on one technology to deliver a whole future of Linux gaming.

Social

The ever increasing popularity of social gaming is a definite threat to traditional forms of gaming. Social gaming comes in many forms, but an obvious example would be games that can be played on Facebook and other social networking websites where games and statistics can be viewed and shared online with a player’s friends. This form of gaming is very limited as the games that can be played via social networks are usually targeted towards casual gamers and not the hardcore PC type. I don’t see social gaming becoming an immediate threat to native gaming in the near future and will probably remain a casual space.

Cloud

Cloud gaming is a similar form of gaming to social gaming, yet differs in a sense that the game content is hosted on the internet, or the “cloud”. Generally speaking, cloud based games are usually more graphical intensive than most games you will find on social networks. I have played around with several cloud based titles and have been quite impressed with what I have experienced. But the worlds internet network is faced with an ever increasing problems of bandwidth availability. Intensive graphical game titles theoretically require lots of bandwidth to push the graphical features of these games down the internet to a gamers computer. And that is where cloud based gaming will hit a wall. There will be a fine line between how far game developers can push the graphics for cloud based game titles, unless the world’s problem of bandwidth is solved in the short term.

WINE

I guess you could refer to gaming with WINE as a fork method of native gaming. But it can not be referred to as native. WINE is a software application which allows users of the Linux operating system to install and run software applications and games developed for Microsoft Windows, on a Linux based operating system. WINE has been around for a long time and has matured in to a very stable package. And it has even spawned several other similar projects which integrate WINE in to their functions. More recently, PlayOnLinux has become a popular choice for running games on Linux. But neither is a perfect solution to the gaming needs of Linux users. Some games run perfectly fine using WINE. They are usually games that run on the OpenGL graphical architecture. Although the number of DirectX based games that are being run through WINE is ever increasing. Some games do not run very well and performance is too bad to even warrant trying. And then there are some titles that will not install. Or if they can be installed, game content will not boot or run as intended. If you limit the amount of titles you play and research a games compatibility with WINE prior to purchase, then WINE gaming can become a viable option for Linux gamers. And with further development and support of WINE, it could easily become a viable alternative to Windows native gaming for Linux users.

Virtual

Our last option is Virtualized gaming. This is done through running a Windows operating system of choice virtually on Linux using virtual software. ie. Oracle VM VirtualBox. Early implementations of Sun Microsystems VirtualBox did not include the ability to run a virtual Windows OS with support for DirectX. Yet, more recent versions of Oracle VM VirtualBox have support to enable DirectX using the Add-Ons package. It is important to point out that DirectX support is still regarded as experimental and gaming performance is very limited, if usable at all. But it looks promising that in the future, we may see Windows based games running on a virtual Windows Guest, on a Linux based Host.

If any of the above gaming options are going to make Linux gaming viable long-term, I believe that Steam could be a good short term solution. But long term gaming success on Linux needs a more permanent solution which gives the gamer full control, as does Windows native gaming. Virtualized gaming could be it. It’s seemingly technically possible and as long as the hardware is capable of running such games in a virtual environment, I see no reason to believe that it can not be done.

If you’re anything like me, you probably rely on a range of different methods for your Linux gaming. I run some native games. Others run through PlayOnLinux. And some of them run solely using WINE. If you’re a Linux gamer, please let us know how you game and what technologies you use to suit your needs.

--------------------------------------------------------------------- Options for Linux Gamers

Ubuntu One takes the next step: Adds Photo Sharing

M. Zinoune — Mon, 07 Jan 2013 20:50:27 +0000

Canonical’s cloud storage services Ubuntu One now offers new features for its users: Photo Sharing. Available through the Files Apps on mobile devices, users can use their email accounts or any of the social network accounts to access, share or manage their photos and files directly.

With cloud storage services offered by a host of service providers like the ever popular DropBox, Google’s Google Drive or Microsoft’s SkyDrive, Ubuntu One stands continues to offer new and interesting features that being value addition to a simple, easy to use free cloud storage service. With massive 5GB of free storage available open source platform users have all they need to transit to cloud-based services.

After 3 years of deployment

Following its initial release in May 2009, the cloud storage service can be availed on any device running on Ubuntu 9.04 and higher, Android 2.1 and above, Windows XP or Server, iOS 3.1 and higher.
Using Ubuntu One, users can store files on the cloud, and sync files between all their computing devices like the desktops at home or office and mobile devices. A key factor that cloud storage offers greater band-width for users is the option to store as well as stream music on their smart devices.

Photo Sharing feature

Bringing in value addition to the already available features is the ‘photos’ feature. It comes via a dedicated tab, located on the dashboard. Users can gain a complete album view of all the photos that have been saved through Ubuntu One or other photo sharing programs such as Instagram.
Photo albums can be managed chronologically as well as alphabetically allowing complete viewing of images either individually or use the slide-share feature.

Ubuntu One Relevance, in a crowded cloud storage space

Agreed, Canonical offers both free services for regular users and paid services for their corporate clientele, but the innovation and value addition they are bringing to open source– be it the touch-based user interface to align with the popular tablet and smartphone form factor interfaces (read Unity over GNOME 2) is driving the growth of the open source adoption by the newer generations who missed the challenges that the open source movement has passed through.
Open source is indeed becoming increasingly relevant to smart device users as it allows them the flexibility and the choice of the platform they can use and yet have innovative features that would otherwise be very expensive and probably prohibitive to many.
Cloud computing on mobile internet is a humungous market segment that is seeing fast growth spurts and Ubuntu One’s suite of services are indeed a reason for several users who are at ease using open source platforms to transit to the cloud.

--------------------------------------------------------------------- Ubuntu One takes the next step: Adds Photo Sharing

How to Securely Share Files Between Linux Systems

Chris Jones — Fri, 04 Jan 2013 14:56:01 +0000

Last week, I posted a “How To” on how to share files using an FTP server. Unfortunately, FTP is not what is considered secure, for over the internet file transfers. And especially when you’re transferring sensitive data. Thankfully, there is another secure option. In today’s How To, I’ll show you how to share your files the same as before, but using the secure SSH protocol.

The first thing we’ll need to to is install the required package to get the job done. The package is openssh-server. That’s the actual SSH server required to run for other computers to access the computer running the SSH server. And this can be installed using the following command in a terminal:

sudo apt-get install openssh-server

SSH is much easier to setup than an FTP server. And once the server has been installed, there’s almost no configuration changes required to get it running other than allowing access via your firewalls, which I will show you how to do.

Before we actually have access to the SSH server, we must make a few easy changes to the firewall to actually allow for other computers to access the SSH server. If you’re using Ubuntu, then chances are you’re probably using ufw for your system firewall. All you need to do to allow access to the SSH server is type in the following command in to your terminal:

sudo ufw enable

This will ensure the firewall is active and running at system startup. Now type the following:

sudo ufw allow 22

This will open port 22 in the firewall to allow for access to the SSH server. If you do not open this port, other computers will not be able to access your SSH server.

Now that we’ve enabled access via software firewall, we must also enable access via your home network router so that you can access the SSH server over the internet. This will vary depending on your router, so you may have to refer to the router manual to perform these changes.

You need to open port 22 in your router’s firewall and port forward port 22 (SSH) requests to the SSH server’s local IP address. In this instance, the local IP address I am using is 192.168.0.2. But this will vary for every home network.

So now that we’ve installed the SSH server, configured the settings for access and enabled access via both the software and hardware firewall, it’s now time to see whether our SSH server works. If you have followed the above instructions step-by-step, then everything should work correctly. If for some reason you can not connect to the server, the most likely issue will be your firewall settings. Be sure to check over the settings again and ensure you have configured them correctly.

For some simple testing, we need to jump on to a different computer system. For our test, we will boot up Nautilus File Manager as it has built in support for SSH access and other methods of server access.

Launch Nautilus and go to File > Connect to Server. And for Service type, change the option to SSH. In the server setting, you’ll need to type the IP address of the computer we just set up the SSH server on. For this test, I used the local IP 192.168.0.2, but use whatever your own system is using. And also remember, if you are accessing your SSH server over the internet, you need to enter the IP address of the internet connection and not the local IP address. Once you’ve typed in the correct IP address for the server, we need to enter Port 22 for access. In the folder setting, just type in home. And upon login to the SSH server, it will take you directly the /home directory of the file system. And the Username setting is pretty obvious, just type your username to login to the SSH server. Once all of the information is entered, just click Connect and Nautilus should now connect to the SSH server. It will prompt you for your password. Once you enter your password, Nautilus will open up the SSH server directory just like any other local directory on the system.

You should now have full access on the system using FTP. Once you have finished copying your files to or from the server, you should always close the connection. In Nautilus, this is done exactly the same as unmounting any other removable drive media. On the left-hand side pane, you will see an eject icon, click this and Nautilus will disconnect from the SSH server.

That’s it. You now have a full functioning secure SSH server running on your network which can be accessed via any other computer on your home network or over the internet.

If you feel FTP is unsecure for your file transfers between computer systems, then give SSH a try as it is the secure alternative to FTP for general files.

--------------------------------------------------------------------- How to Securely Share Files Between Linux Systems

How to install Oralce 11g R2 Database server on Centos 6.3

pirat9 — Wed, 02 Jan 2013 19:52:19 +0000

Question: How to install Oralce 11g R2 Database server on Centos 6.x?

Answer:

1-Before to begin you have to download Some dependencies

yum -y install binutils compat-libstdc++-33 elfutils-libelf elfutils-libelf-devel glibc glibc-common glibc-devel gcc gcc-c++ libaio libaio-devel libgcc libstdc++ libstdc++-devel make sysstat unixODBC unixODBC-devel

2-adjust the sysctl.conf

in my case

[root@Oracle ~]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key
error: "net.bridge.bridge-nf-call-iptables" is an unknown key
error: "net.bridge.bridge-nf-call-arptables" is an unknown key
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296

Please change to the standard Oracle values

net.ipv4.ip_forward = 0
 net.ipv4.conf.default.rp_filter = 1
 net.ipv4.conf.default.accept_source_route = 0
 kernel.sysrq = 0
 kernel.core_uses_pid = 1
 net.ipv4.tcp_syncookies = 1
 net.ipv4.ip_local_port_range = 9000 65500
 fs.file-max = 65536
 kernel.shmall = 10523004
 kernel.shmmax = 6465333657
 kernel.shmmni = 4096
 kernel.sem = 250 32000 100 128
 net.core.rmem_default = 262144
 net.core.wmem_default = 262144
 net.core.rmem_max = 4194304
 net.core.wmem_max = 1048576
 fs.aio-max-nr = 1048576

3-add users and groups and permissions

[root@Oralce ~]#groupadd -g 200 oinstal
[root@Pirat9 ~]#groupadd -g 201 dba
[root@Pirat9 ~]#useradd -u 440 -g oinstall -G dba -d /app/oracle oracle

[root@Pirat9 ~]#vi /etc/pam.d/login
# add
session    required     pam_selinux.so open
 session    required     pam_namespace.so
 session    required     pam_limits.so
 session    optional     pam_keyinit.so force revoke
 session    include      system-auth
 -session   optional     pam_ck_connector.so

[root@Pirat9 ~]#vi /etc/security/limits.conf
 # add This  bellow
 oracle   soft   nproc   2047
 oracle   hard   nproc   16384
 oracle   soft   nofile   1024
 oracle   hard   nofile   65536

 [root@Pirat9 ~]#vi /etc/profile
 # add at the last line
 if [ $USER = "oracle" ]; then
 if [ $SHELL = "/bin/ksh" ]; then
 ulimit -p 16384
 ulimit -n 65536
 else
 ulimit -u 16384 -n 65536
 fi
 fi

Now Switch to a user Oracle

 [oracle@Pirat9 ~]$chmod 755 /app/oracle
[oracle@Pirat9 ~]$mkdir /app/oracle/app
[oracle@Pirat9 ~]$chmod 775 /app/oracle/app
[oracle@Pirat9 ~]$mkdir /app/oracle/oradata
[oracle@Pirat9 ~]$chmod 775 /app/oracle/oradata

[oracle@Pirat9 ~]$vi ~/.bash_profile
 # add this to oracle profile

ORACLE_HOME=/app/oracle/11.2.0.2/client
ORACLE_BASE=/app/oracle
TEMP=/app/tmp/ora
TMPDIR=/app/tmp/ora

export ORACLE_HOME
export ORACLE_BASE
export TEMP
export TMPDIR
export PATH

PATH=$PATH:$HOME/bin::$ORACLE_HOME/bin
umask 022

Now run the installer and enjoy

--------------------------------------------------------------------- How to install Oralce 11g R2 Database server on Centos 6.3

Adobe bundles Game Developing Tools with new Creative Cloud

anuradha.shukla — Wed, 02 Jan 2013 19:01:17 +0000

If you are a keen game developer and have a cache of games hidden away on your desktop, then it will soon be time to bring out an exclusive catalog of your games by signing up for Adobe Creative Cloud offer.

Game Development is not an easy task. However, thanks to Adobe’s latest integrated tool kit, game developers can toy with their gaming ideas and MONETIZE them as well.
The new Adobe Creative Cloud lets you access (on a monthly membership) the entire professional CS6 tools and open source frameworks-Starling, Feathers,Away 3D and iOS native extensions to create amazing work for Print, websites and for apps(more so for the iPad) along with a Gaming SDK. There is also a Flash C++ Compiler, that will let you convert existing iOS,PCs, Xbox 360 or PlayStation 3 games for browsers, running on Flash Player. The Adobe Creative Cloud offer includes a trial version for Flash Professional CS6 and Flash Builder 4.7 Premium version.
Additionally, a new profiling feature in the package, AdobeScout is gaining traction amongst the game-building and game-publishing community in the pre-release stage, especially for its unique performance measuring metrics. This tool will pull all latent granular data from applications written in ActionScript running on mobiles and browsers aiding in the tuning and improvement of the games’ performance.
Using the professional version of Flash CS6 that comes with the offer,developers can author games/animations, while the Flash Builder, version 4.7 (premium edition) provides the ecosystem for compiling in ActionScript Compiler 2.0 (ASC 2.0). Developers can test apps directly on iOS devices using either the USB or the simulator and debug them as well.
Helping open source developers are tools such as the Starling, for 3D games with a library of open source ActionScript3, which mimics the list architecture of a typical Flash Player and direct rendering through GPU (Stage 3D) for optimized rendering feature.
Feathers is for creating UI extension components (lightweight) for desktops and mobile systems as it gathers into one bundle GPU-powered graphics, via Starling for quick response.
Another tool is the Away3D, an open source 3D graphics engine, also in ActionScript3 that, works in tandem with Starling and Feathers to ensure seamless integration of 2D UIs with 3D games.
Basic requirements to run Adobe Gaming SDK:
Flash Player 11.4 or higher
Adobe AIR 3.4 or higher
Along with launching the new Cloud Creative, Adobe is also running a promotion for subscribers of the cloud package. The entire tools package is available free to use for subscribers of the Cloud Creative service. All future versions of Scout will be updated for such of the users who continue to subscribe.

--------------------------------------------------------------------- Adobe bundles Game Developing Tools with new Creative Cloud

Happy New year 2013

M. Zinoune — Mon, 31 Dec 2012 08:46:24 +0000

Wishing everybody a happy new year 2013

--------------------------------------------------------------------- Happy New year 2013

How to install sqldeveloper on Linuxmint 14/Ubuntu12.10

pirat9 — Tue, 18 Dec 2012 09:00:34 +0000

Oracle SQL Developer is an Integrated development environment (IDE) for working with SQL in Oracle databases. Oracle Corporation provides this product free; it uses the Java Development Kit.

Oracle SQL Developer supports Oracle products and a variety of third-party plugins which users may deploy to connect to non-Oracle databases. Oracle SQL Developer works with IBM DB2, Microsoft Access, Microsoft SQL Server, MySQL, Sybase Adaptive Server, and Teradata databases.

Oracle SQL Developer supports automatic tabs, code insight, bracket matching and syntax coloring for PL/SQL.

1- Download Sqldeveloper from Oracle Website

Pirat9@pirat9-VirtualBox ~/Downloads $ ls
 sqldeveloper-3.2.20.09.87-no-jre.zip

2- Check your installed Java version using the command:

pirat9@pirat9-VirtualBox ~/Downloads $ java   -version
Output
java version "1.7.0_07"
 OpenJDK Runtime Environment (IcedTea7 2.3.2) (7u7-2.3.2a-1ubuntu1)
 OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)
 pirat9@pirat9-VirtualBox ~/Downloads $

3- extract SQldeveloper

Cd the directory where you downloaded sqldeveloper and extract the file:

unzip Sqldeveloper .x.x.zip

cd   sqldeveloper

Now make the script executable:

chmod +x  sqldeveloper.sh

4- Now run the sqldeveloper script

./sqldeveloper.sh
Oracle SQL Developer
Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.Type the full pathname of a J2SE installation (or Ctrl-C to quit),
the path will be stored in ~/.sqldeveloper/jdk

Please put your Java PATH

4- connect and enjoy SQL Developer:)

--------------------------------------------------------------------- How to install sqldeveloper on Linuxmint 14/Ubuntu12.10

RHE Virtualization via web portal

M. Zinoune — Mon, 17 Dec 2012 20:48:28 +0000

Few days ago, the makers of Red Hat Enterprise Virtualization (RHEV) have released the latest version – RHEV 3.1- that uses web portals to manage the host systems for virtualization. In its previous avatar, the Administrator Console, the Internet Explorer was a requirement to run the web interface.

With the latest version, released in January, makers have effectively removed legacy Windows dependency. Though seen even in the previous RHEV 3.0 release, it worked more like a Technology Preview and did not carry support officially. It could, however, be used on various browsers through a web interface. Now, this feature is obliterated in RHEV 3.1.

Greater Scaling and support

A pleasant feature is the guest support system, allowing ‘160 logical CPUs’ and memory of 2 Terabytes. This is because of the higher core structure the Red Hat Enterprise Linux 6.3 that is known to support guests. This means that the advanced core structure is also very good at supporting the latest entrants AMD plus INTEL processors that are being introduced in the recent months.
The Desktop Virtualization support too is enhanced in RHEV 3.1. VDI or Virtual Desktop Infrastructure ensures comprehensive support including an auto-start feature and a WAN operation.

Storage Live Migration

Additionally, the latest RHEV version provides another feature- the- Storage Live Migration. This feature was introduced to allow administrators to – move from one SAN storage domain to the next- without exiting the Virtual Machines (VMs) during storage migration. However, users of RHEV have to note that this feature is yet listed as Technology Preview and will therefore not receive support, if required.
RHEV 3.1 will also carry a new feature- Live Snapshots. This feature is to provide a graphic documentation of the VM’s current state, in the form of snapshots, thereby providing huge relief to testers and developers.
RHEV3.1 has also been further beefed allowing higher integration of RHEV 3.1 with server appliance – Red Hat Storage Server.

Extended Ecosystem Support

New RHEV for SAP Business Applications running on the Red Hat Enterprise Linux has already been certified.
A 60-day trial RHEV version is also available if users choose to register for the software. With new load of features, RHEV 3.1 has crossed the final step to becoming Windows independent and instead allowing web portal based use for easier and simpler virtualization services. Once this feature too is included in the Support portfolio, it will not be before long when organizations too can choose to virtualize via web portals.

--------------------------------------------------------------------- RHE Virtualization via web portal