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Linux stores most user preferences in so-called dot files in the user s home directory. If a filename starts with a dot, it will not be displayed by the ls command unless you use the -a option and is therefore regarded as a hidden file. Both dot files and dot directories are used to hold preferences for most of the programs you use. Many programs will write a new dot file in your home directory when you run them for the first time. Many of these dot files have names that include the letters rc this comes from the initial letters of run command and is an old Unix legacy. The same letters rc will be seen in the SUSE commands used for starting and stopping services. In particular, the KDE desktop uses a directory .kde in a user s home directory to store preferences for all KDE programs as well as your desktop settings. This directory contains multiple subdirectories and preference files for many KDE applications. The behavior of the bash shell is determined by the user s file .bashrc. Exactly how bash preferences are set is complicated; as mentioned earlier, the system-wide files /etc/profile and /etc/profile.local are also read, and the user s file .profile is read at login. You can modify various aspects of how bash behaves by editing .bashrc. In particular, you could change your umask simply by adding a line at the end of .bashrc like this:

Although it is quite easy to pin-point general performance problems, it is harder to make general recommendations to fix these Most details are unique to each operating system A few generic pointers can nonetheless offer the greatest and most obvious gains, while the tweaking of system-dependent parameters will put the icing on the cake To identify a problem, we must first measure the performance Again, there are the two issues: user perception of performance (interactive response time); and system throughput, and we have to choose the criterion we wish to meet When the system is running slowly, it is natural to look at what resources are being tested, ie What processes are running How much available memory the system has Whether disks are being used excessively..

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If you were then to log in and create a file, you would find that it had permissions -rw------- or 600, so it would be not be readable or writable by any other user (apart from root). Similarly, if you created a directory, it would have the permissions drwx------, so that it could not be explored by any other user. The file .bashrc can also be used to control the appearance of the prompt and set paths and environment variables. The user s file .xinitrc (if it exists) controls the behavior of the X Window system when it is started by the user. In particular, the window manager to be used could be specified with lines in .xinitrc near the end of the file similar to this:

7:

The chromosome representation of each individual consists of two information types, i.e. genotypic and phenotypic. An individual is represented by the tuple (for ease of notation, the generation subscript is omitted)

You probably don t want to make exactly that change, but it serves to illustrate what is possible. You might also want to include a command to start an xterm, which is a command-line terminal application that runs within the X Window system, immediately before starting the window manager:

It can sometimes be useful to remember that if you are having difficulties with the behavior of programs as a user, removing (or better, hiding) the relevant dot file may help you diagnose the problem. So for example, you could do this:

yourself. Firewall proxies exist for most services to avoid handling potentially dangerous network connections directly. We shall return to the issue of proxy services in the discussion of firewalls in section

The next time you start emacs, it will start without a preferences file so you can look through your previous one to try to solve the problem.

Mounting a filesystem is what you need to do to make the files it contains available, and the mount command is what you use to do that. In Linux, everything that can be seen is part of one big tree of files and directories. Those that are on physically different partitions, disks, or remote machines are grafted on to the system at a particular place a mount point, which is usually an empty directory. To find out what is currently mounted, simply type the command mount on its own.

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