Command screen will allow you to quickly and easily work in multiple system shells without having to log in every time in a new console. You log in once and open only one SSH session, but you can run great number of shell windows. And the most important is that when you finish the connection for some reason, all the shell windows will be waiting for your return.
The operating system lives without administrator intervention. It must periodically run some work, sometimes associated with the orders of, and sometimes just the tasks related to their function. To define when and how the task will run are described in this micro-course programs at and cron.
Micro-course covers the basic issues of communication in the network. As a network administrator you should know how to set IP address, what the routing table is and for what purposes it is used. In this micro-course you will learn how to properly configure the DNS resolver. You will learn the basic commands used for testing the cennectivity.
Poorly configured domain name system can cause problems in network communication, This is what the administrators often say. It is fundamental to know the tools and to have the knowledge to test the operation of the DNS system and search for bugs in it. Micro-course provides practical knowledge about the commands: host, dig, nslookup, whois.
What is the reason people see a picture of admin sitting and doing nothing? Thanks to protocols such as DHCP administrator does not need to run around and manually configure the computers on the network. On one hand the facilitation and on the other the correct IP address scheme. DHCP configuration requires adequate knowledge, we take a look at DHCP in this micro-course.
Linux as a multi-user operating system, from the beginning, uses the simplest methods of handling mailings and messages. After reading this micro-course you will learn the basic commands to help you to communicate with other administrators, and broadcast messaging system on the local network .
Because Linux administrators work in the text shell, it is natural that the e-mail can be used in text mode. Additionally, even the easiest program to manage e-mails has the ability to send messages automatically. That is why the system will notify you via e-mail about important operating system and application issues.
In addition to standard e-mail clients, there are many programs prepared to use scripts. Scripting enables the automation of activities of the system. Running the selected tool, will, for example, send a message with information about the system problem.
Discussions on the newsgroups, so called Usenet, it really was the beginning of building communities (social groups) on the Internet. What is interesting - Usnet still works and is even quite dynamicly. You should know how to get there, because many Linux specialists and hackers are still using this mean of communication.
Modern web page viewed in a text console? It seems something completely unnecessary, but it turns out that sometimes it is necessary. Especially when the remote server does not have a graphical environment, and you need to log in to the manufacturer's website and download additional packages.
File transfer over the Internet, on the contrary to the opinions of some lamers, should not be done through the HTTP protocol. FTP, optimized for transmission of different (and largr, small, binary and text) files is the solution. In this micro-course we will present the tools to use it.
In desktop environments, there are many amazing and powerful programs to download both files and whole web sites. For many years, wget has been the undisputed leader in the text environment programs to do these tasks. The program is easy to use for basic tasks, but having discovered an incredibly powerful capabilities of it, users who need more specific than simply copying files will use wget instead of graphical programs.
SSH is used for remote administration of operating systems (shell and copy files). It is a secure tool that every administrator needs to know very well. Thanks to SSH, adminstrator can administer the server, and also copy files between servers, etc.
Data transfer takes time, and time is expensive. Data storage takes space, and the space is also the cost of IT. Most of the data can be compressed, resulting in a reduction of costs. In this micro-course each professional administrator will find the knowledge and skills necessary for zipping files. The administrator should also pay attention to costs, shouldn't he?
Before making major changes in the system, it is good idea to copy some data (sometimes all files) on a separate disk resource (or tape). Something can always goes wrong, a person can make mistakes. But if we have a copy of the data (backup) we are safe(r). Tools for performing data backup are discussed precisely in this micro-course.
Equipment can always fail, a person may also fail. If the administrators don't want to get fired due to data loss they should have the backup of all the systems. There are several methods and strategies of backup, but as long as the administrator (you) is not sure which of them are implemented, and that they work correcty, you should not sleep peacefully.