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acceptance in the Unix world. It has since been ported to Windows operating systems. Perl programming has to some extent replaced shell programming as the Free Software lingua franca of system administration. The Perl language (see Appendix ) is a curious hybrid of C, Bourne shell and C-shell, together with a number of extra features which make it ideal for dealing with text files and databases. Since most system administration tasks deal with these issues; this places Perl squarely in the role of system programming. Perl is semi-compiled at runtime, rather than interpreted line-by-line like the shell, so it gains some of the advantages of compiled languages, such as syntax check before execution, and so on. This makes it a safer and more robust language. It is also portable (something which shell scripts are not [13]). Although introduced as a scripting language, like all languages, Perl has been used for all manner of things for which it was never intended. Scripting languages have arrived on the computing scene with an alacrity which makes them a favourable choice to anyone wanting to get code running quickly. This is naturally a mixed blessing. What makes Perl a winner over many other special languages is that it is simply too convenient to ignore, for a wide range of frequently required tasks. By adopting the programming idioms of well-known languages, as well as all the basic functions in the C library, Perl ingratiates itself to system administrators and becomes an essential tool. At the time of writing, only the GNU/Linux operating system bundles Perl as standard software. However, with a huge program base written in Perl, it is already indispensible.

For example, suppose that you want to set an environment variable named SAVEME to the name of the current directory so that you can remember it If the current directory is /home/wvh, you can set the SAVEME environment variable to this directory with the following command:.

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In some countries doctors do not get paid if their patients get sick. This motivates them to practice preventative medicine, thus keeping the population healthy and functional at all times. A computer system which is healthy and functional is always equipped to perform the task it was intended for. A sick computer system is an expensive loss, in downtime and in human resources spent fixing the problem. It is surprising how effective a few simple measures can be toward stabilizing a system. The key principle which we have to remember is that system behaviour is a social phenomenon, an interaction between users' habits and resource availabilty. In any social or biological system, survival is usually tied to the ability of the system to respond to threats. In biology we have immunity and repair systems; in society we have emergency services like fire, police, paramedics and the garbage collection service, combined with routines and policy ('the law'). We scarely notice these services until something goes wrong, but without them our society would quickly decline into chaos. 7.5.1 Policy Decisions

One common task involving environment variables is to add a new directory to the columnseparated value of the PATH environment variable so that your shell looks in that directory for executables. For example, suppose that you ve just installed the popular Linux Firefox browser on your system. Firefox is typically installed in the directory /usr/local/firefox, and the binary program that you actually execute to run the browser is /usr/local/ firefox/firefox. You can always execute Firefox by typing the full pathname of the firefox command, but that s a bit tedious. A better solution is to add the directory /usr/ local/firefox to the value of your PATH environment variable (generally referred to as adding it to your path ). You can do this within the current shell by executing the following command:

The algorithm restarts each N consecutive epochs for which no reduction in error could be achieved, at which point the algorithm finds a new direction to search. The function to calculate the derivative E (w) = |4 computes the derivative of with respect to each weight for each of the patterns. The derivatives over all the patterns are then summed, i.e.

After typing this command, you can execute the firefox command from that shell by simply typing firefox and pressing Return.

A policy of prevention requires system managers to make several important decisions. Let's return for a moment to the idea that users are the greatest danger to the stability of the system; we need to strike a balance between restricting their activities and allowing them freedom. Too many rules and restrictions leads to unrest and bad feelings, while too much freedom leads to anarchy. Finding a balance requires a policy decision to be made. The policy must be digested, understood and, not least, obeyed by users and system staff alike:

The sample export command tells the shell to export a new value for the PATH environment variable, where that value consists of the directory /usr/local/firefox prefixed to the previous value of the PATH environment variable. The first reference to the PATH variable identifies the name of the variable that you want to set. Any environment variable preceded by a $ means that you are referring to the value of that variable, not its name.

7:

When you ve customized the value of your PATH environment variable, you will probably want to do that same customization each time you log in and in every shell that you start (in each Konsole window, each xterm, and so on). You can do this by adding the previous command to any existing PATH setting in your bash startup file, which is the file .bashrc in your home directory, or by putting this as the last command in your .bashrc file. See the section on Configuring user preferences later in this chapter for more information about the .bashrc configuration file.

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