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2.3.1 Unix File Model Unix has a hierarchical file system which makes use of directories and sub-directories to form a tree. All file systems on Unix-like operating systems are based on a system of index nodes, or inodes, in which every file has an index entry stored in a special part of the file system. The inodes contain an extensible system of pointers to the actual disk blocks which are associated with the file. The inode contains essential information needed to locate a file on the disk. The top or start of the Unix file tree is called the root file system or '/'. Although the details of where common files are located differ for different versions of Unix, some basic features are the same.

If you re unfamiliar with the basic commands used in the rest of this chapter, your best plan is to experiment. Just as the best way to learn a language is to speak it, the best way to learn Linux commands is to use them. Experiment as freely as possible and play.

The following pseudocode presents a general EP algorithm: 1. Let the current generation be g = 0. 2. Initialize the population Cg = { C g \ n = 1,..., N}. 3. While no convergence (a) Evaluate the fitness of each individual C g,n as FEp(Cg,n)(b) Mutate each individual Cg,n to produce offspring Og,n. (c) Select the new population Cg+1,n from Cg and Og.

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The ls (list) command lists files in the current directory. The command ls has a very large number of options, but what you really need to know is that ls -l gives a long listing showing the file sizes and permissions, and that the -a option shows even hidden files those

The main sub-directories of the root directory together with the most important file are shown below Their contents are as follows: /b in Executable (binary) programs On most systems this is a separate directory to /usr/ bin In SunOS, this is a pointer (link) to /usr/bin /etc Miscellaneous programs and configuration files This directory has become very messy over the history of Unix and has become a dumping ground for almost anything Recent versions of unix have begun to tidy up this directory by creating subdirectories / etc/mail, /etc/services, etc! /usr This contains the main meat of Unix This is where application software lives, together with all of the basic libraries used by the OS /usr/bin More executables from the OS /usr/local This is where users" custom software is normally added /sbin A special area for statically linked system binaries.

with a dot at the start of their name. The shell expands the * character to mean any string of characters not starting with . . (See the discussion of wildcards in the Advanced shell features section earlier in this chapter for more information about how and why this works.) Therefore, *.doc is interpreted as any filename ending with .doc that does not start with a dot and a* means any filename starting with the letter a. For example: ls -la Gives a long listing of all files in the current directory including hidden files with names staring with a dot ls a* Lists all files in the current directory whose names start with a ls -l *.doc Gives a long listing of all files in the current directory whose names end with .doc

They are placed here to distinguish commands used solely by the system administrator from user commands, and so that they lie on the system root partition where they are guaranteed to be accessible during booting /sys This holds the configuration data which go to build the system kernel (See below) /export Network servers only use this This contains the disk space set aside for client machines which do not have their own disks It is like a 'virtual disk' for diskless clients /dev and /devices A place where all the 'logical devices' are collected These are called 'device nodes' in Unix and are created by mknod Logical devices are Unix's official entry points for writing to devices For instance, /dev/console is a route to the system console, while /dev/kmem is a route for reading kernel memory Device nodes enable devices to be treated as though they were files.

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