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Scientific Linux

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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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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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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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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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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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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How do I use bash auto complete features with various command on CentOS / RHEL / Fedora / Scientific Linux based systems?
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