tutorial - Multimedia support in OpenSuse 11.1 (MP3, MPEG-4, DiVX, etc.)

Why doesn’t OpenSuSe support MP3 ‘out of the box’?

OpenSuSe cannot include support for MP3 or DVD video playback or recording. MP3 formats are patented, and the patent holders have not provided the necessary licenses. OpenSuSe also excludes other multimedia software due to patent, copyright, or license restrictions, such as Adobe Flash Player and RealNetworks RealPlayer.

That doesn’t mean you can’t play .mp3 files in OpenSuSe , it just takes a bit of work (not much).

Follow these instructions to get mp3 and other multimedia support on your OpenSuSe 11.1.

If you are using KDE - Download and run (execute) this
If you are using Gnome - Download and execute this

Want VLC player - Download and run this

This will enable you to have:
Flash
Java
Latest Amarok (with MP3 Support) for KDE, or Helix-Banshee for GNOME users
Encrypted DVD (libdvdcss)
Extra XINE Codecs, for DivX/Xvid etc. (libxine1)
K3b with MP3 Support (k3b-codecs)
Win 32 Codecs (w32codec-all)

And after sucesfull installation you should be able to play any media files.


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source:http://linuxpoison.blogspot.com/2008/12/13578175715283.html

tutorial - How to change the Mysql users and root password

There are two way to change the mysql user and root password

mysqladmin
If you have never set a root password for MySQL, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows:

$ mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

$ mysqladmin -u root -p oldpassword newpass

Enter password:
Change MySQL password for other user

To change a normal user password you need to type (let us assume you would like to change password for nikesh):

$ mysqladmin -u nikesh -p oldpassword newpass

Changing MySQL root user password using mysql sql command
This is another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update password using the following method to update or change password for user vivek:

1) Login to mysql server, type following command at shell prompt:

$ mysql -u root -p

2) Use mysql database (type command at mysql prompt):

mysql> use mysql;

3) Change password for user nikesh:

mysql> update user set password=PASSWORD("NEWPASSWORD") where User='nikesh';

4) Reload privileges:

mysql>  flush privileges;
mysql> quit


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source:http://linuxpoison.blogspot.com/2008/12/135781757110657.html

tutorial - NFS configuration for central storage

Configuring The NFS Server
1. Edit the /etc/exports file to allow NFS mounts of the /home directory with read/write access.

/home                   *(rw,sync,no_subtree_check)

The option listing for each machine will describe what kind of access that machine will have. Important options are:

ro: The directory is shared read only; the client machine will not be able to write to it. This is the default.

rw: The client machine will have read and write access to the directory.

no_root_squash: By default, any file request made by user root on the client machine is treated as if it is made by user nobody on the server. (Excatly which UID the request is mapped to depends on the UID of user "nobody" on the server, not the client.) If no_root_squash is selected, then root on the client machine will have the same level of access to the files on the system as root on the server. This can have serious security implications, although it may be necessary if you want to perform any administrative work on the client machine that involves the exported directories. You should not specify this option without a good reason.

no_subtree_check: If only part of a volume is exported, a routine called subtree checking verifies that a file that is requested from the client is in the appropriate part of the volume. If the entire volume is exported, disabling this check will speed up transfers.

sync: By default the exportfs command will use async behavior, telling a client machine that a file write is complete - that is, has been written to stable storage - when NFS has finished handing the write over to the filesysytem. This behavior may cause data corruption if the server reboots, and the sync option prevents this.

2. Let NFS read and make /home available to the network with the exportfs command.

# exportfs -a

3. Make sure the required nfs, nfslock, and portmap daemons are running and configured to start after the next reboot.

# chkconfig nfslock on
# chkconfig nfs on
# chkconfig portmap on

# service portmap start
# service nfslock start
# service nfs start

Configuring The NFS Client
1. Make sure the required netfs, nfslock, and portmap daemons are running and configured to start after the next reboot.

# chkconfig nfslock on
# chkconfig netfs on
# chkconfig portmap on

# service portmap start
# service netfs start
# service nfslock start

2) Now mount the NFS (server) /home to this client

# mount server:/home /home/

3) Configure autofs edit your /etc/auto.master file to refer to file /etc/auto.home for mounting information whenever the /home directory is accessed. After five minutes, autofs unmounts the directory.

# vi /etc/auto.master
/home      /etc/auto.home --timeout 600

4) Edit file /etc/auto.home to do the NFS mount whenever the /home directory is accessed.

# vi /etc/auto.home
*   -fstype=nfs,soft,intr,rsize=8192,wsize=8192,nosuid,tcp server:/home/&


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source:http://linuxpoison.blogspot.com/2008/12/135781757113901.html

tutorial - Linux Directory Structure

Directory
Contents
/
Root directory—the starting point of the directory tree.
/bin
Essential binary files, such as commands that are needed by both the system administrator and normal users. Usually also contains the shells, such as Bash.
/boot
Static files of the boot loader.
/dev
Files needed to access host-specific devices.
/etc
Host-specific system configuration files.
/home
Holds the home directories of all users who have an account on the system. Only root's home directory is not located in /home but in /root.
/lib
Essential shared libraries and kernel modules.
/media
Mount points for removable media.
/mnt
Mount point for temporarily mounting a file system.
/opt
Add-on application software packages.
/root
Home directory for the superuser root.
/sbin
Essential system binaries.
/srv
Data for services provided by the system.
/tmp
Temporary files.
/usr
Secondary hierarchy with read-only data.
/var
Variable data such as log files.
/windows
Only available if you have both Microsoft Windows* and Linux installed on your system. Contains the Windows data.


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source:http://linuxpoison.blogspot.com/2008/12/135781757116305.html

tutorial - System Information

File
Description
/proc/cpuinfo
This displays processor information, including its type, make, model, and performance.
/proc/dma
This shows which DMA channels are currently being used.
/proc/interrupts
This shows which interrupts are in use and how many of each have been in use.
/proc/iomem
This displays the status of I/O (input/output) memory.
/proc/ioports
This shows which I/O ports are in use at the moment.
/proc/meminfo
This displays memory status.
/proc/modules
This displays the individual modules.
/proc/mounts
This displays devices currently mounted.
/proc/partitions
This shows the partitioning of all hard disks.
/proc/version
This displays the current version of Linux.


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source:http://linuxpoison.blogspot.com/2008/12/1357817571833.html

tutorial - OpenSuse Log files

Log File
Description
~/.xsession-errors
Messages from the desktop applications currently running. The ~ is the home directory of the current user.
/var/log/apparmor/
Log files from AppArmor, see Novell AppArmor Administration Guide (↑Novell AppArmor Administration Guide) for detailed information.
/var/log/audit/audit.log
Log file from Audit to track any access to files, directories, or resources of your system and trace system calls.
/var/log/boot.msg
Messages from the kernel during the boot process.
/var/log/mail.*
Messages from the mail system.
/var/log/messages
Ongoing messages from the kernel and system log daemon when running.
/var/log/NetworkManager
Log file from NetworkManager to collect problems with network connectivity
/var/log/samba/
Directory containing Samba server and client log messages.
/var/log/SaX.log
Hardware messages from the SaX display and KVM system.
/var/log/warn
All messages from the kernel and system log daemon assigned WARNING level or higher.
/var/log/wtmp
Binary file containing user login records for the current machine session. View it with last.
/var/log/Xorg.*.log
Various start-up and runtime logs from the X Window system. It is useful for debugging failed X start-ups.
/var/log/YaST2/
Directory containing YaST's actions and their results.
/var/log/zypper.log
Log file of zypper.


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source:http://linuxpoison.blogspot.com/2008/12/135781757114283.html

tutorial - Using .htaccess for password protecting web directory

Htaccess can be used to password-protect directories on your web site. All files and any subdirectories within a directory protected by htaccess will also be protected.

1) Create a file named .htaccess under the directory which you want to protect

# cd /srv/www/htdocs/protect/
# pwd
/srv/www/htdocs/protect

Use your favourite editor to create a file called .htaccess

# touch .htaccess

2) Add the required lines to this .htaccess file
AuthUserFile /etc/apache/.htpasswd
AuthName "Auth required"
AuthType Basic
Require valid-user
It's good idea to place the password file at some secure place (/etc/apache) folder

3) Create the .htpasswd file and add the users/passwd
# cd /etc/apache
# htpasswd2 -c .htpasswd nikesh
New password:
Re-type new password:
Adding password for user nikesh
#
This will add the user "nikesh" and password into the .htpasswd file, you can open and check the entry (you won't be able to read the password)

To delete the user entry:  # htpasswd2 -D .htpasswd nikesh
To add new user:  # htpasswd2 .htpasswd user

4) Configure the apache configuration file (httpd.conf)
Alias /protect "/srv/www/htdocs/protect/"

        Options Indexes MultiViews FollowSymLinks
        AllowOverride AuthConfig
        Order allow,deny
        Allow from all

When you set up .htaccess files it will be effective for the directory that they are placed in as well as any subdirectories.  If you wanted to set up a direcotory so that it could execute CGI scripts you could use a .htaccess file to do that.

Here the most important part is the option "AuthConfig" for "AllowOverride", if for some reason you don't want to use the .htaccess file, just place the option "None" for "AllowOverride".

5) After doing all the required changes, restart the apache server.

Now, just browse to the directory path that you have protected and see if you are getting the username/password dialog, provide the correct values and see if you are allow to enter.

Below are the most common problems experienced by users attempting to setup htaccess.

   1. Permissions on both .htaccess and .htpasswd - Both the .htaccess and .htpasswd files need to be world readable.
   2. Fully qualified path to .htpasswd incorrect - The correct fully qualified path to a valid .htpasswd file must appear beside AuthUserFile in the .htaccess file.
   3. The username doesn’t exist in .htpasswd


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source:http://linuxpoison.blogspot.com/2008/12/135781757111257.html

tutorial - Creating Recycle Bin for Samba storage

I assume that you have successfully configure the samba server, if not, here is a quick and dirty samba configuration guide -  here

Samba is mainly used to share the files between Linux and windows and many times it happens that user deletes the file from the samba server and later wants to get back deleted files which is not possible with the default configuration of samba server.

The best option is to have a "Recycle bin" for every users on the samba server.
Here is an example of modifying the home directories of your users in samba configuration file
[homes]
comment = Home Directory
valid users = %S
browsable = no
guest ok = no
read only = no
vfs object = recycle
recycle:repository = RecycleBin
recycle:keeptree = yes
recycle:exclude = *.tmp, *.bak
The “vfs object” line calls in the plug-in that enables recycle bin capability.  On the other lines, you’re setting the name of the recycle bin directory, telling Samba to preserve the whole structure of any directories that a user may delete, and finally, telling it to not keep certain types of files.


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source:http://linuxpoison.blogspot.com/2008/12/13578175713632.html

tutorial - A script for managing file archives of various types

atool  is a script for managing file archives of various types (tar, tar+gzip, zip etc).

The main command is aunpack which extracts files from an archive. Did you ever extract files from an archive, not checking whether the files were located in a subdirectory or in the top directory of the archive, resulting in files scattered all over the place? aunpack overcomes this problem by first extracting to a new directory. If there was only a single file in the archive, that file is moved to the original directory. aunpack also prevents local files from being overwritten by mistake.

The other commands provided are apack (to create archives), als (to list files in archives), and acat (to extract files to standard out). As atool invokes external programs to handle the archives, not all commands may be supported for a certain type of archives.

atool identifies archives by their file extension. Sometimes this is not possible - for instance rar archives usually have varying numeric file extensions. In those cases when atool can't identify the format, file is used instead. (atool can be configured not to use file.)

atool is written in Perl by Oskar Liljeblad and is free software (GNU General Public License ).

Download
The latest version of atool is 0.35.0, which was released on 2008-06-08:
Source code tarball
Debian package (all architectures)
RPM package (all architectures)

Building from source
To build all files, simply run: ./configure
The configure script accepts a few options - use the following command to show them: ./configure --help

Installation
Installing atool is a matter of copying the atool file to some appropriate directory for executable files, usually /usr/local/bin. After that, symbolic links for apack, aunpack, als and acat to atool should be created in the same directory. All this can be done automaticly by running: make install

Usage and Configuration
A list of options that atool accepts can be displayed by running atool with the --help option:  atool --help
Please see the manual page for atool for full use and configuration information. This document can usually be viewed this way:  man ./atool.1


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source:http://linuxpoison.blogspot.com/2008/12/135781757118843.html

tutorial - Firewall for Ubuntu - Gufw

iptables is already a very powerful tool by itself, but it's syntax can get awkward at times and hard to figure out, so Ubuntu developers decided to make ufw ("The reason ufw was developed is that we wanted to create a server-level firewalling utility that was a little bit more for `human beings`."), which was to be simpler. Now, on the graphical side of things, Firestarer already existed. But why not make an even easier to use GUI for desktop `human beings`, powered by ufw? This is where Gufw  comes in.


Gufw is an easy to use Ubuntu  / Linux firewall, powered by ufw.

Gufw is an easy, intuitive, way to manage your Linux firewall. It supports common tasks such as allowing or blocking pre-configured, common p2p, or individual ports port(s), and many others! Gufw is powered by ufw , runs on Ubuntu, and anywhere else Python, GTK, and Ufw are available.

You can install it on ubuntu with this deb package: here


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source:http://linuxpoison.blogspot.com/2008/12/13578175716151.html

tutorial - Creating executable of Shell Script

Many times it happen that shell scripts that we write contains sensitive information like password or some sort of keys or path to some sensitive files and if you running such script it become very easy for the normal user to have a look inside the script and get the sensitive information from the code.
There is a program called "shc" which can provide the protection from such cases that developer wants.

shc itself is not a compiler such as cc, it rather encodes and encrypts a shell script and generates C source code with the added expiration capability. It then uses the system compiler to compile a stripped binary which behaves exactly like the original script. Upon execution, the compiled binary will decrypt and execute the code with the shell -c option. Unfortunatelly, it will not give you any speed improvement as a real C program would.

shc's main purpose is to protect your shell scripts from modification or inspection. You can use it if you wish to distribute your scripts but don't want them to be easily readable by other people.

Download shc (here) and untar it:
tar -xzvf shc-X.X.tgz
cd shc-X.X/
make
make install
This will install the shc binary on your box.

Create a file called: script.sh and add the following contents for testing purpose

############################### script.sh ##############################
#!/bin/sh
echo "This is a test shell script by Nikesh"
############################### script.sh ##############################

Now run the command:
shc -f script.sh

The switch "-f" specifies the source script to encrypt. The above command will create two files: script.sh.x.c and script.sh.x. The encrypted shell script is: script.sh.x. Run that binary and see the output:

./script.sh.x
This is a test shell script by Nikesh
Now you can distibute the script.sh.x without any fear

You can also specify a time limit on the shell script so that it will no longer execute after a certain date (expire) and you can specify a custom message to echo back to the user.

shc -e 09/12/2008 -m "Licence expire, please contact author - Nikesh" -f script.sh
./script.sh.x
./script.sh.x has expired!
Licence expire, please contact author - Nikesh

Check out the man pages for more info on "shc".


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source:http://linuxpoison.blogspot.com/2008/12/135781757114982.html

tutorial - Quick and Easy VNC Server setup

VNC, or Virtual Networked Computing, is a way of controlling a remote computer just as though you are sitting in front of it. In the Windows world it is also known as remote desktop but it's normally referred to as VNC in the Linux world. All that happens is that you connect using a VNC client to a remote computer running the VNC server, then an image of the remote desktop is transmitted to your local computer and you can see and control the desktop just as though you are there since all keyboard and mouse commands are sent from your client machine to the server.

Step:1: Installation
First check if you already have them installed on your system, open a terminal and type:
 $ rpm -qa | grep vnc 
           vnc-server-4.1.2-9.el5
If you get an output something like this then you're all ready, if not you need to install them via yum.

Step 2 : Start the VNC server.
$ vncserver
 ......

New 'server:1 (user)' desktop is server:1

This will ask for password, you need to remember this password and need to provide it at the time of connecting to the server through VNC client.

Step 3 : Connecting from VNC client
From client run vncviewer   (dont run remote desktop connection from winxp or win2003 .they are using different protocol.)
In server enter : server:1
enter password: **********
And you will see the screen with one terminal open because by default vnc starts twm desktop.
For getting your gnome desktop
Go to folder /user/.vnc/ (user home directory) and open file xstartup using vi editor and uncomment or add the following lines
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc
Restart the vncserver and connect to it using vncviewer, you should now see your default desktop, something like ..


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source:http://linuxpoison.blogspot.com/2008/12/13578175717167.html

tutorial - Read - Write support for NTFS partition on OpenSuse 11.x

The ntfs-3g driver is an open source, GPL licensed, third generation Linux NTFS driver which was implemented by the Linux-NTFS project. It provides full read-write access to NTFS, excluding access to encrypted files, writing compressed files, changing file ownership, access right.

Technically it's based on and a major improvement to the third generation Linux NTFS driver, ntfsmount. The improvements includes functionality, quality and performance enhancements.

First, of course install the drivers for reading - writing NTFS, if you have NTFS partitions, you can install it from the openSUSE installation CD/DVD or from the repository OSS using YAST, search for "ntfs" and install all the necessary package (below)




Now, just start from the root tool, ntfs-config and enable them to write support for NTFS partitions on your computer, this tool will detect the ntfs partition on your drive.



Or open as root with your favourite editor /etc/fstab, find the line of the partition that you want to enable write, in my case is this:

/dev/sda1 /mnt/c ntfs defaults 0 0

Now, replace the ntfs and default part of the above line with following:

ntfs-3g defaults, users

In my case, then you'll get:
/dev/sda1 /mnt/c ntfs-3g defaults,users

Restart you machine and check if you are able to read/write to NTFS partition.


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source:http://linuxpoison.blogspot.com/2009/01/135781757119939.html

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