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Scientific Linux

What Is SELinux?

What is SELinux? Why should I use SELInux on my CentOS or Red Hat Enterprise Linux server running on IBM hardware?
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I'm getting the following error when I run mysql -u root -p

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

How do I solve this problem under CentOS / RHEL / Red Hat Enterprise Linux server 5.x or 6.x?
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How do I disable or enable SELinux policy modules under Red Hat Enterprise Linux running on Dell hardware?
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Extra Packages for Enterprise Linux (or EPEL) is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL),CentOS and Scientific Linux (SL). How do I enable it under CentOS 6 or RHLE 6 server?
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CentOS / RHEL: yum Command Reinstall Package

I accidental deleted the configuration file stored in /etc/ directory and the latest backup were made yesterday. How do I resinstall the package using the yum command under RHEL / CentOS Linux server?
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I've recently swiched from Ubuntu Linux to CentOS / RHEL / Scientific Linux version 6 gnome desktop. However, I'm unable to find the gpass the password manager for GNOME2 desktop in repo. How do I install the same under RHEL 6 or CentOS or Scientific Linux 6 or Fedora Linux 15?
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How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?
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