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All Unix and Linux shells support several ways of locating file and directory names that match a specified pattern. As you might expect, when working from the command line, one of the most common things that you will want to do is to specify the names of one or more files as arguments to other commands. To make it easier to identify specific files without requiring that you type every filename in its entirety, Linux shells provide a number of different ways to specify patterns that can be used to match specific filenames. The most basic pattern-matching provided by Linux shells such as bash are two special characters known as wildcards, which means that these characters can match any other character. Linux shells support two basic wildcards: Asterisk (*) Also referred to as the star, can represent any number of characters in a row Question mark ( ) Can represent any single character In addition to these wildcards, Linux shells support two other ways to match specific patterns within filenames: By specifying ranges of values separated by a dash within square brackets. For example, the expression [1-3] will match any instance of the numbers from 1 to 3, inclusive. By specifying lists of comma-separated values enclosed within braces (also known as curly brackets). For example, the expression {1,3} will match either the number 1 or the number 3.

A few examples will help clarify how you can use these to identify certain files in your directories. Suppose that a directory contains the following files: file1 file1.doc file2 file2.doc file3 file3.txt file8 other_file.doc Given this list of files, Table 2-1 shows how you can use wildcards, ranges of values, and lists to match specific files. As you ll see later in this chapter, pattern matching is especially useful when listing file and directory names that match specific patterns.

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Damage and loss can come in many forms: by hardware failure, resource exhaustion (full disks, excessive load), by security breaches and by accidental error. General provisions for prevention mean planning ahead in order to prevent loss, but also minimizing the effects of inevitable loss: Do not rely exclusively on service or support contracts with vendors. They can be unreliable and unhelpful, particularly in an organization with little economic weight. Vendor support helpdesks usually cannot diagnose problems over the phone, and a visit can take longer than is convenient, particularly if a larger customer also has a problem at the same time. Invest in local expertise. Educate users by posting information in a clear and friendly way. Make rules and structure as simple as possible, but no simpler. Keep valuable information about configuration securely, but readily available. Document all changes and make sure that co-workers know about them, so that the system will survive, even if the one who made the change is not available. Do not make changes just before going away on holiday: there are almost always consequences which need to be smoothed out. Be aware of system limitations, hardware and software, capacity. Do not rely on something to do a job it was not designed for. Work defensively and follow the pulse of the system. If something looks unusual, investigate and understand what is happening. Avoid gratuitous changes to things which already work adequately. 'If it ain't broke, don't fix it'.

/ 3.4

* file *.doc file .doc file .* file[1-3] file{1,3} file{1,3}.{doc,txt}

Redundancy is our last avenue of survival [242]. Duplication of service and data gives us a fallback which can be brought to bear in a crisis.

file1, file1.doc, file2, file2.doc, file3, file3.txt, file8, other_file.doc file1, file2, file3, file8 file1.doc, file2.doc, other_file.doc file1.doc, file2.doc file1.doc, file2.doc, file3.txt file1, file2, file3 file1, file3 file1.doc, file3.txt

As explained later in this chapter in the section Listing files, Unix and Linux systems do not list files that begin with a period by default. Therefore, the wildcard * will match only all visible files in a directory (files whose names do not begin with a period), even though the * matches the period in the middle of a filename.

Vendors often like to pressure sites into signing expensive service contracts. Modern computer hardware is pretty reliable these days, the only exception being cheap PC kits. For the cost of a service contract it might be possible to buy several new machines each year, so one can ask the question: should we write off seldom hardware failure as acceptable loss, or pay the one-off repair bill If one chooses this option, it is important to have another host which can step in and take over the role of the old one, while a replacement is being procured. Again, this is the principle of redundancy. The economics of service contracts need to be considered carefully. 7.5.3 Garbage Collection

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