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red hat enterprise

Where are NIC (network interface configuration) files located in the Redhat / Fedora / Centos Linux?
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HowTo: Upgrade Red Hat Enterprise Linux to v5.5

How do I upgrade to Redhat Enterprise Linux server to v.5.5 from 5.4 or earlier version?
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How do I see attached scsi devices for my IBM Linux server powered by Red Hat Enterprise Linux 5 or 6? How do I list all sata hard disk names under Debian or Ubuntu Linux?
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Help: Old Employees Accessing The Linux Server

I've recently noticed that two of my former employees are still accessing one of our Linux box. Old user account wasn't deleted because it has some important files. How do I make sure account get deleted without losing files and email stored in the account? Can you describe a terminations clearance policy for an employee account including email accounts, forwarding aliases, ssh / ftp, and access to vpn dialup services under Red Hat Enterprise Linux server?
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I like the way Ubuntu Linux works - all people in admin groups should able to run all commands after running it via sudo "command-name". How do I setup sudo under CentOS or Red Hat Enterprise Linux to allow all members of the 'admin' group to run all commands?
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Linux Disable Wireless Networking ( Wi-Fi )

We have over 20+ Dell Precision M6400 laptops pre installed with Red Hat Enterprise Linux version 5.x. I was asked to disable Wi-Fi on all laptops as it poses a serious security risk to our sensitive (classified) systems and networks. How do I disable wireless networking (802.11) under Linux?
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How do I install ModSecurity - an open source intrusion detection and prevention engine for web applications under CentOS / RHEL / Red Hat Enterprise Linux 5.x server?
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