solution for this  yum repository that I found by disabling all the yum repositories  and re-enabling them 1 by one.this worked for me,hope it will work for all.

Please commecnt on this post so that  if you know any alternative workaround for this.

1.You need to below lines to sources.list file,to do this run below command on terminal

$sudo gedit /etc/apt/sources.list

2.Add below scoure links

deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu karmic main

3.Save and close file.

4.Now you need to add trusted key for this repository,by running below line

$sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 247510BE

5.Now you need update apt-get

$sudo apt-get update

6.if you have firefox remove first and run below command

$sudo apt-get install firefox-3.6

All set now,now you can run firfox 3.6

First you need to create

1.[root@localhost ]# touch /etc/yum.repos.d/CentOS-5.repo

2.Add below lines to Centos-5.repo file

[c5-testing]
name=CentOS-5 Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=0
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

3.[root@localhost ~]# yum –enablerepo=c5-testing install php
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirror.nus.edu.sg
* base: mirror.nus.edu.sg
* extras: mirror.nus.edu.sg
* livna: ftp-stud.fht-esslingen.de
* rpmforge: ftp-stud.fht-esslingen.de
* updates: mirror.nus.edu.sg
c5-testing                                                                                        | 1.9 kB     00:00
c5-testing/primary_db                                                                             | 502 kB     00:08
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package php.i386 0:5.2.9-2.el5.centos set to be updated
–> Processing Dependency: php-common = 5.2.9-2.el5.centos for package: php
–> Processing Dependency: php-cli = 5.2.9-2.el5.centos for package: php
–> Running transaction check
—> Package php-cli.i386 0:5.2.9-2.el5.centos set to be updated
–> Processing Dependency: php-common = 5.1.6-23.2.el5_3 for package: php-mysql
–> Processing Dependency: php-common = 5.1.6-23.2.el5_3 for package: php-pdo
–> Processing Dependency: php-common = 5.1.6-23.2.el5_3 for package: php-ldap
—> Package php-common.i386 0:5.2.9-2.el5.centos set to be updated
–> Running transaction check
—> Package php-ldap.i386 0:5.2.9-2.el5.centos set to be updated
—> Package php-mysql.i386 0:5.2.9-2.el5.centos set to be updated
—> Package php-pdo.i386 0:5.2.9-2.el5.centos set to be updated
–> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================================
Package                     Arch                  Version                             Repository                   Size
=========================================================================================================================
Installing:
php                         i386                  5.2.9-2.el5.centos                  c5-testing                  1.2 M
Updating for dependencies:
php-cli                     i386                  5.2.9-2.el5.centos                  c5-testing                  2.4 M
php-common                  i386                  5.2.9-2.el5.centos                  c5-testing                  237 k
php-ldap                    i386                  5.2.9-2.el5.centos                  c5-testing                   31 k
php-mysql                   i386                  5.2.9-2.el5.centos                  c5-testing                   80 k
php-pdo                     i386                  5.2.9-2.el5.centos                  c5-testing                   62 k

Transaction Summary
=========================================================================================================================
Install      1 Package(s)
Update       5 Package(s)
Remove       0 Package(s)

Total download size: 4.0 M
Is this ok [y/N]: y
Downloading Packages:
(1/6): php-ldap-5.2.9-2.el5.centos.i386.rpm                                                       |  31 kB     00:00
(2/6): php-pdo-5.2.9-2.el5.centos.i386.rpm                                                        |  62 kB     00:01
(3/6): php-mysql-5.2.9-2.el5.centos.i386.rpm                                                      |  80 kB     00:01
(4/6): php-common-5.2.9-2.el5.centos.i386.rpm                                                     | 237 kB     00:04
(5/6): php-5.2.9-2.el5.centos.i386.rpm                                                            | 1.2 MB     00:22
(6/6): php-cli-5.2.9-2.el5.centos.i386.rpm                                                        | 2.4 MB     00:42
————————————————————————————————————————-
Total                                                                                     53 kB/s | 4.0 MB     01:16
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 7203f491
c5-testing/gpgkey                                                                                 | 1.8 kB     00:00
Importing GPG key 0×7203F491 “CentOS-testing (CentOS Developers testing key) <centos@centos.org>” from http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Updating       : php-common                                                                                       1/11
Updating       : php-pdo                                                                                          2/11
Updating       : php-cli                                                                                          3/11
Installing     : php                                                                                              4/11
Updating       : php-ldap                                                                                         5/11
Updating       : php-mysql                                                                                        6/11
Cleanup        : php-common                                                                                       7/11
Cleanup        : php-pdo                                                                                          8/11
Cleanup        : php-ldap                                                                                         9/11
Cleanup        : php-mysql                                                                                       10/11
Cleanup        : php-cli                                                                                         11/11

Installed:
php.i386 0:5.2.9-2.el5.centos

Dependency Updated:
php-cli.i386 0:5.2.9-2.el5.centos       php-common.i386 0:5.2.9-2.el5.centos     php-ldap.i386 0:5.2.9-2.el5.centos
php-mysql.i386 0:5.2.9-2.el5.centos     php-pdo.i386 0:5.2.9-2.el5.centos

Complete!

Yum is an interactive ,rpm based,pakackage manager.It can automatically performs system updates.It also performs installation of new packages and removal of new packages.

Below are the yum manual

To list the yum options

$yum -h

To list the installed package that matches given string

$yum list httpd

To localate all packages that contain the string “httpd”

$yum search httpd

To install the package

$yum install (pakagename)

To remove the packagae

$yum remove (paclage name)

Description about the package

$yum info httpd

To view the package dependencies

$yum deplist httpd

To check installed package version

$yum check-update

To update outdated  packages

$yum update

To clean cache

$yum clean all

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
88:26:99:fb:z5:1d:92:e5:z6:6e:t3:499c:99:af:90.
Please contact your system administrator.
Add correct host key in /home/username/.ssh/known_hosts to get rid of this message.
Offending key in /home/username/.ssh/known_hosts:9
RSA host key for 192.168.1.2 has changed and you have requested strict checking.
Host key verification failed.

Solution is remove the keys for that ip or hostname ,like below

$ssh-keygen -R 192.168.1.2

/home/username/.ssh/known_hosts updated.
Original contents retained as /home/username/.ssh/known_hosts.old

After above step now you can ssh to remote machine

Features :

• kernel 2.6.18-164.6.1.el5
• gnome 2.16.0
• kde 3.5.4
• gimp 2.2.13
• firefox 3.0.15

Software added compared to standard Scientific Linux

* ntfs-3g (read/write NTFS support)
* ntfsprogs
* gparted
* reiserfs-utils, progsreiserfs
* ms-sys
* testdisk
* dd_rescue
* ddrescue
* partimage
* iperf
* xdialog
* xfe, rxvt-unicode (only on Mini LiveCD)

click here to download

about Scientific:

Scientific Linux is a free   Linux distribution  which aims to be 100% compatible with and based on Red Hat Enterprise Linux.free & open source software made available by Red Hat, Inc., but is not produced,maintained or supported by Red Hat. Specifically, this product is built from the source code for Red Hat Enterprise Linux versions.

To check the connected storage on the linux partition ,type below command.

$fdisk -l
(it displays connected storage table details)

To create partition ,you need to run below commands

$fdisk /dev/sda2

arugments

n’ – to add a new partition
‘p’ – primary
‘1′ – start cylinder
‘+5096M’ – to indicate 5 Gigabytes
‘w’ – to write the changes to the disk

Note:Fdisk create only raw partition

to format raw partition.

$mke2fs -j /dev/sda2

after this check weather it is mounted are not using below command.

$cat /etc/fstab

or

$du -h

if  /dev/sda2 is not mounted to then you need to mount using below command

$sudo mount /dev/sda2 /mnt/disk

(here i have mounted that into my desired location you can change as per your requirement)

now add  mount location to /etc/fstab by doingbelow command

$vi /etc/fstab

add below line

/dev/sda2 /mnt/disk  defaults,locale=en_IN 0 0

by doing it will automatically mount this partition on every boot.

click here for more info

High lights:

• Linux Kernel 2.6.31.5
• GNOME 2.28.0
• KDE 4.3.2
• ext4
• NFS4
• NetBeans 6.7
• Perl 6
• GFS2 using CTDB

click here to download

HighLights:

• Linux kernel 2.6.31.5
• GNOME 2.28.0
• KDE 4.3.1
• EXT4 filesystem
• OpenOffice.org 3.1
• WebYaST

click here to download

run directly .

you can trouble shoot in two ways.

one is you need to change the owner permissions

by running

$chown username.uername -R .wine

or

do below steps

first you need to remove wine by running below command

$rm -rfv ~/.wine

then run wine configure to create fresh .wine folder again in the home directory

$winecfg