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Linux sys-unconfig: Reconfigure the System Upon Next Boot

I can use unconfigure command on a previously configured Solaris Unix box and leave it in an unconfigured state. How do I unconfigure CentOS Linux OR RHEL 6.x on HP server. How do I reconfigure the system upon next boot?
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FreeBSD: Install zsh Shell

How do I install the Z shell ( zsh ) shell under FreeBSD 9 operating systems?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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HowTo: Shutdown Linux System

I‘m a new Linux user. How do I shutdown Linux based system using command line options?
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HowTo: Linux List Disk Partitions Command

How do I list all hard disk partitions under Linux operating systems?
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OpenBSD: Install Firefox Web Browser

How do I install Mozilla Firefox which is a free and open source web browser under OpenBSD operating systems?
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FreeBSD Install VMWare Guest Tools

How do I install VMWare tools under FreeBSD guest operating systems?
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Howto: Shutdown Linux System From Terminal

How do I shutdown Linux system from terminal or command line options?
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Ubuntu Linux CD: Default Username and Password

Can you tell me the default username and password for an Ubuntu Live CD? How do I login using Ubuntu Linux live cd?
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Force SSH Client To Use Given Private Key ( identity file )

Recently, my desktop hard disk crashed. So I reinstalled Linux and created a new set of private RSA keys for authentication. However, two of my remote UNIX servers still uses old DSA keys. I do not remember root password for those servers. I do have backup of private and public DSA keys and currently stored in /backup/home/user/.ssh/id_dsa and /backup/home/user/.ssh/id_dsa.pub. How do I force my ssh clients to use identity file /backup/home/user/.ssh/id_dsa to get back to my remote UNIX servers?
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