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Scientific Linux

CentOS/RHEL Use yum Command To Downgrade or Rollback Updates

I'm a CentOS Linux 7.x server user. How can I use yum command to downgrade or rollback package updates on a RHEL (Red Hat)/CentOS/Scientific Linux server?
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HowTo: Prevent Yum From Upgrading The Kernel On a CentOS / Red Hat Enterprise Linux

I am a new RHEL / Centos Linux server admin. I would like yum to update all packages except the Linux Kernel. How can I prevent yum command from updating kernel on a CentOS/RHEL/Fedora Linux based systems?
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CentOS / RHEL: Install iftop To Display Bandwidth Usage Per interface By Host

I am running Red Hat Enterprise Linux on IBM based system. How do I display bandwidth usage on an interface by host in real time using command line option? How do I monitor bandwidth usage in a real time on RHEL or CentOS Linux based server? How can I install iftop utility on CentOS or RHEL server using the yum command?
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RHEL / Fedora /CentOS Linux: Set RPM Build Environment

How do I set an rpm build environment on CentOS / RHEL / Red Hat Enterprise Linux version 6.x? How can I set rpm build environment on latest version of Fedora Linux?
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Linux / Unix Bash Shell List All Builtin Commands

Builtin commands are contained within the bash shell itself. How do I list all bash builtin commands under Linux / Apple OS X / *BSD / Unix like operating systems without reading large bash man page?
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GCC: Linux gnu/stubs-32.h: No such file or directory

I have Debian / Ubuntu Linux. I need to compile software written in C. The gcc throwing an error that read as follows:

gnu/stubs-32.h: No such file or directory compilation terminated. make: *** [foo.o] Error 1

How do I fix this problem under Debian or Ubuntu Linux 64 bit system and compile apps using gcc compiler?
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RHEL / CentOS: Install and Activate Bash Autocomplete Feature

How do I use bash auto complete features with various command on CentOS / RHEL / Fedora / Scientific Linux based systems?
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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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CentOS / RHEL: Disable or Enable SELinux Policy Modules

How do I disable or enable SELinux policy modules under Red Hat Enterprise Linux running on Dell hardware?
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