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Command second-character-list
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Table 11-4: Edit Filters Execution character list that occur in the input are replaced in the output by corresponding characters in the second character list.
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You can save the output of a filter in a file or send it to a printer. To do so, you need to use redirection or pipes. To save the output of a filter to a file, you redirect it to a file using the redirection operation, >. To send output to the printer, you pipe the output to the lpr utility, which then prints it. In the next command, the cat command pipes its output to the lpr command, which then prints it.
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$ cat complist | lpr
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Other commands for displaying files, such as more, may seem to operate like a filter, but they are not filters. You need to distinguish between filters and device-oriented utilities, such as lpr and more. Filters send their output to the standard output. A device-oriented utility such as lpr, though it receives input from the standard input, sends its output to a device. In the case of lpr, the device is a printer; for more, the device is the terminal. Such device-oriented utilities may receive their input from a filter, but they can only output to their device. All filters accept input from the standard input. In fact, the output of one filter can be piped as the input for another filter. Many filters also accept input directly from files, however. Such filters can take filenames as their arguments and read data directly from those files. The cat and sort filters operate in this way. They can receive input from the standard input or use filename arguments to read data directly from files. One of the more powerful features of cat is it can combine the contents of several files into one output stream. This output can then be piped into a utility or even another filter, allowing the utility or filter to operate on the combined contents of files as one data stream. For example, if you want to view the contents of several files at once, screen by screen, you must first combine them with the cat filter and then pipe the combined data into the more filter. The more command is, then, receiving its input from the standard input. In the following set of examples, the cat filter copies the contents of preface and intro into a combined output. In the first example, this output is piped into the more command. The more filter then enables you to view the combined text, screen by screen. In the second, the output is piped to the printer using the lpr command and, in the third, the output is redirected to a file called frontdata.
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$ cat preface intro | more $ cat preface intro | lpr $ cat preface intro > frontdata
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Types of Filter Output: wc, spell, and sort
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The output of a filter may be a modified copy of the input, selected parts of the input, or simply some information about the input. Some filters are limited to one of these, while others have options that specify one or the other. The wc, spell, and sort filters illustrate all three kinds of output. The wc filter merely prints counts of the number of lines, words, and characters in a file. The spell filter selects misspelled words and outputs only those words.
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The sort filter outputs a complete version of the input, but in sorted order. These three filters are listed in Table 11-3, along with their more commonly used options. The wc filter takes as its input a data stream, which is usually data read from a file. It then counts the number of lines, words, and characters (including the newline character, found at the end of a line) in the file and simply outputs these counts. In the next example, the wc command is used to find the number of lines, words, and characters in the preface file:
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