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enterprise linux

Redhat Linux: Change User Password

How do I change password under Redhat Enterprise Linux?
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Linux Upgrade Password Hashing Algorithm to SHA-512

The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?
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CentOS / Redhat: Protect Yum Repo's Packages

How do I protect my yum repo's packages from certain repositories getting replaced / updated via yum command itself under CentOS / RHEL / Redhat Enterprise 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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Linux Disable and Remove X Windows (X.org)

I revived my new Dell server pre installed with Red Hat Enterprise Linux server v5.2. However, my box boot with a GUI login system ( Gnome ). There is no reason to run X Windows on my dedicated mail and Apache web server. I only need ssh. How do I disable X login and windows without reinstalling the operating system to improve security and performance?
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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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CentOS: Install Packages Via yum Command Using DVD / CD as Repo

How do I install packages via DVD / CD using yum command under CentOS Community Enterprise Linux version 5.x?
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CentOS Add Route Command

How do I add route (router IP 192.168.1.254) to my Centos Linux systems from the command line?
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Redhat Linux yum grouplist and groupinstall Option Not Working

I'm trying to install all the default packages by group using 'yum groupinstall groupname' command under RHEL v5.x. But, grouplist, groupinstall, and groupdelete options are not working with yum. How do I fix this issue and make sure yum command works with software groups under Redhat Enterprise Linux to increase my productivity?
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yum Download All Source Packages (SRPM) From RedHat / CentOS WebSite

How can I use yum to download source packages instead of manually downloading every single package from RHN / CentOS / RedHat Ftp website?
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