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Redhat / CentOS: Install Internet whois / nicname Client

How do I install whois client to see whois information about domain and ip address using command line options under Fedora / RHEL / Redhat / CentOS / Scientific Linux?
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RHEL 6: semanage SELinux Command Not Found

I'm trying to use semanage command to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources under RHEL 6 server. But, I'm not able to find out this command and/or package name. How do I install semanage command under RedHat Enterprise Linux?
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Linux Install an RPM File

I'm a new Linux system administrator and wanted to perform software installation and maintenance. I've downloaded a file called awstats.i386.rpm and how do I install it under CentOS / RHEL / Suse / Fedora / Redhat Linux?
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Install Iptables Firewall in Redhat / CentOS Linux

How do I install iptables under Redhat (RHEL) or CentOS or Fedora Linux operating systems?
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Linux Display System Statistics Gathered From /proc

How do I display information from /proc such as memory, Load average, uptime, page activity, context, disk status, interrupts using a shell or perl script?
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Linux / UNIX: Software Update Vs Upgrade – What’s the Difference?

What the differences between a Linux or UNIX software update and an upgrade? How do I perform the both?
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UNIX / Linux: Shell Scripting With mail Command

How do I send e-mails from a shell script including file attachments?
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yum update Linux Error: Missing Dependency: xen-libs

When I type "yum update" under RHEL 5.x server I get the following error:

Error: Missing Dependency: xen-libs

How do I fix this problem?
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CentOS / RHEL Linux: Remove GDM

How do I uninstall a GUI Gnome login system ( GDM ) from my CentOS Linux v5.5 based server?
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CentOS / RHEL: Install PostgresSQL Interface for Perl (perl-DBD-Pg)

How do I install PostgresSQL interface for perl for programming purpose under Redhat / RHEL / Fedora / CentOS Linux?
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