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configuration files

CentOS / RHEL: Delete Old Yum Repositories and Configuration Files

How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?
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Sysadmin because even developers need heroes!!!

UNIX: Lynx Browser Set / Change the Default Home Page

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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Linux: Find Out My Machine (Host) Name

How do I find out my server name (machine name) under Linux operating systems using command shell?
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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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Linux: Configure Xorg X11 Window System

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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Start / Stop / Restart Postfix Mail Server

How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?
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Linux / UNIX Restrict at / cron Usage To Authorized Users

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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HowTo: UNIX Restart Apache Server

How do I restart Apache web server under UNIX operating systems using command line or over the ssh session?
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FreeBSD Install and Configure Webmin Web-based Interface ( Control Panel )

Q. How do I install webmin control panel for my FreeBSD server?
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Linux / FreeBSD: Multiple IP Addresses on One Interface

Q. Can one Linux / BSD system respond to multiple IP address on a single Ethernet interface? I need to run multiple web sites and mod_ssl with a single server. How do I configure my box for multiple IP address?
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