repository directory to remove broken repositories
 cd /etc/yum.repos.d/

$ cat /etc/redhat-release
CentOS release 6.4 (Final)

download centos minimal
format your cool disk into two partitions. around 1GB FAT32 and the rest ext2.
run Unetbootin and let it make the FAT32 bootable . copy the image itself to the ext2 partition. /images/iamge.img
boot from usb  and select ext2 partition as the location of the OS files.

default username: root

to setup gui:
$ ifup eth0
yum groupinstall basic-desktop desktop-platform x11 fonts

$ startx    # to start gui
Ctrl+Alt+F2 to switch back to commanline

Install Firefox: here and here.
$ yum install filezilla    # much less hassle-free than going through all dependencies
$ sudo yum install gnome-utils

After installing dropbox it causes an error. to fix:
When you installed dropbox, it added a repo file to track updates. It uses a variable to grab packages for your current version of fedora, but they aren't building packages for F15 yet. In the meantime, edit /etc/yum.repos.d/dropbox.repo and add the line
http://linux.dropbox.com/fedora/15/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://linux.dropbox.com/fedora/15/repodata/repomd.xml Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

$ yum install man

$ init 6      # to restart

 نحوه ی افزودن زبان فارسی به لینوکس سنت اواس centos 6.4:

ترمیتال را باز کرده و دستور زیر را اجرا کنید

$ su -
$ gnome-keyboard-properties

پس از اضافه کردن زیان فارسی روی دکمه ی
Layout Options
کلیک کنید و
Keys to change layout
گزینه ی
را انتخاب کنید


Download the Fedora ".repo" for Play on Linux to do so go to this website:  http://rpm.playonlinux.com/playonlinux.repo from your web browser select "File - Save Page As" a dialogue should now appear and you should have the option to save the page as "playonlinux.repo" select your "Home" folder from the left hand pane and hit "save".

Step 2. Next we need to move the .repo file to our yum repo directory to do so open Terminal and type the following:
sudo cp playonlinux.repo /etc/yum.repos.d/

Step 3.  Finally we must update our repos and install Play On Linux
sudo yum update
sudo yum install playonlinux