SED: A powerfull Text Manipulator in linux/unix

                    You need to use find command which is used to search files and directories under UNIX and Linux like operating systems. You can specify criteria while search files. If no criteria is set, it will returns all files below the current working directory. find also supports regex matching and other advanced options.

Crontab usage and Cron Example

           Cron is a daemon that executes scheduled commands. Cron is started automatically from /etc/init.d on entering multi-user runlevels. Cron searches its spool area (/var/spool/cron/crontabs) for crontab files (which are named after accounts in /etc/passwd); crontabs found are loaded into memory. Note that crontabs in this directory should not be accessed directly - the crontab command should be used to access and update them.

Cron also reads /etc/crontab, which is in a slightly different format (see crontab(5)). Additionally, cron reads the files in /etc/cron.d.

Connecting to MySQL database with C code

                MySQL databases may be used by programs written in the C programming language on Socrates and Plato and on the IS Solaris workstations. Full details of the C API (Application Program Interface) are given in the MySQL manual at http://www.mysql.com/doc/en/C.html.

How to Set up A Web Server in Linux?

Contributed by Davidlohr Bueso 

              This article teaches you, the reader, how to configure a GNU/Linux based server with three of the most important services that must be provided in a company, at home, a lab or anywhere else, both for clients and internal usage: web, database, mail. So it will be assumed that the idea is to host websites that use certain technologies such as a scripting language and a database (for dynamic sites), and also to act as a mailing tool, for sending and receiving email.

Consider that this article only shows some of the basic features for configuring these services, each program has much more in depth options. Entire books have been written just about Apache or MySQL. So, don't just stay with what you learn here, play around, read, learn; system administration is all about security and performance, so there's a lot more to discover.

netcat : A powerfull Utility

    Contributed by Girish Venkatachalam

            Netcat or nc in short can be aptly described as one of those two letter command-line tools that have all of legendary UNIX magic and power. nc however is a new program and does not share the age of well known programs like cat or dd. However its power and versatility make one think why no one came up with this before.

MySQL Configuration Files

              Configuring a MySQL server is often just a matter of editing the configuration file to make any changes you need and then restarting the server. While that sounds rather simple, adjusting the server's configuration is something you're not likely to do on a daily basis. More likely, you've installed MySQL, configured it minimally or with the defaults, and then let it run. Most users never go back and adjust the server configuration until a problem arises. As a result, it's easy to forget how to configure MySQL.
 

Binary Versus Compiled-From-Source Installations of MySQL

              There are two ways you can install MySQL. As a novice administrator, you may have simply installed a binary package that had precompiled executables, libraries, and configuration files, and placed those files wherever the maker of the binary package decided they should go.