configuration files

How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?

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How do I change the default home page with Lynx browser under UNIX or Linux operating system? How do I set the startup page to http://google.co.uk with Lynx?

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How do I find out my server name (machine name) under Linux operating systems using command shell?

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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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My xorg.conf file is missing as I deleted accidentally for some reason. Now, Xorg try to probe my hardware on every startup. How do I configure Xorg under Debian or any Linux distro / operating systems?

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How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?

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The cron and at services are used to allow commands to be executed at a later time. How do I restrict them to selected users such as root, opt1, opt2 and so on? How do I make sure user php can run php script but cannot modify or install a new job?

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