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The more and less commands are known as pagers because they allow you to view the contents of a text file one screenful at a time and page forward and backward through the file (without editing it). The name of the more command is derived from the fact that it allows you to see a file one screenful at a time, thereby seeing more of it. The name of the less command comes from the fact that it originally began as an open source version of the more command (before more itself became an open source command) and because it originally did less than the more command (the author had a sense of humor). Nowadays, the less command has many added features, including the fact that you can use keyboard shortcuts such as pressing the letter b when viewing a file to move backward through the file. more /etc/passwd Views the contents of /etc/passwd less /etc/passwd Views the contents of /etc/passwd

While it is probably true that faults and problems are inevitable, a solid effort towards prevention can reduce them to a scarcity1. When problems arise, we need to develop a systematic approach to diagnosing the errors and getting the system on its feet again. As in the field of medicine, there is only a limited number of symptoms which a body or computer system can express (sore throat, headache, fever, system runs sluggishly, hangs, etc.). What makes diagnosis difficult is that virtually all ailments therefore lead to the same symptoms. Without further tests, it is thus virtually impossible to determine the cause of symptoms. As mentioned in section , a distressing habit acquired from the home computer revolution is the tendency to give up before even attempting a diagnosis, and simply reboot the computer. This solves nothing and we learn nothing about why the problem arose. It is like killing a patient and replacing him with another. It is a habit which has to be unlearned in a multi-user community. The act of rebooting a computer can have unforseen effects on what

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The head and tail commands allow you to see a specified number of lines from the top or bottom of a file. The tail command has the very useful feature that you can use tail -f to

keep an eye on a file as it grows. This is particularly useful for watching what is being written to a log file while you make changes in the system. Consider the following examples: head -5 /etc/passwd Prints the first five lines of the file /etc/passwd to the screen tail -5 /etc/passwd Prints the last five lines of /etc/passwd to the screen tail -f /var/log/messages Views the last few lines of /var/log/messages and continues to display changes to the end of the file in real time

1 This presumes, naturally, that the basic operating system software is sound. If it is not, then system crashes will be the rule rather than the exception.

The grep (global regular expression print) command is a very useful tool for finding stuff in files It can do much more than even the examples that follow this paragraph indicate Beyond simply searching for text, it can search for regular expressions It s a regular expression parser, and regular expressions are a subject for a book in themselves (but were introduced in the section Advanced shell features earlier in this chapter) When using or administering a system, you often need to look for lines in a file that contain a certain string In the first example that follows, you simply find the lines in the file that contain the string bible The examples with tail are examples of piping the output from one command to another: a very powerful concept that was also introduced in the section Advanced shell features, earlier in this chapter.

bit represents the input symbol, the next two bits represent the next state, and the last two bits represent the output symbol. Each individual therefore consists of 18 bits. The initial population is randomly generated, with the restriction that the output symbol and next state bits represent only valid values.

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