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$ wc preface 6 27 142 preface
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The spell filter checks the spelling of words in its input and outputs only the misspelled.
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$ spell foodlistsp soop vegetebels
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Using redirection, you can save those words in a file. With a pipe, you can print them. In the next example, the user saves the misspelled words to a file called misspell:
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$ spell foodlistsp > misspell
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You can pipe the output of one filter into another filter, in effect, applying the capabilities of several filters to your data. For example, suppose you only want to know how many words are misspelled. You could pipe the output of the spell filter into the wc filter, which would count the number of misspelled words. In the next example, the words in the foodlistsp file are spell-checked, and the list of misspelled words is piped to the wc filter. The wc filter, with its -w option, then counts those words and outputs the count.
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$ spell preface | wc -w 2
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The sort filter outputs a sorted version of a file. sort is a useful utility with many different sorting options. These options are primarily designed to operate on files arranged in a database format. In fact, sort can be thought of as a powerful data manipulation tool, arranging records in a database-like file. This chapter examines how sort can be used to alphabetize a simple list of words. The sort filter sorts, character by character, on a line. If the first character in two lines is the same, sort will sort on the next character in each line. You can, of course, save the sorted version in a file or send it to the printer. In the next example, the user saves the sorted output in a file called slist:
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$ sort foodlist > slist
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Searching Files: grep and fgrep
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The grep and fgrep filters search the contents of files for a pattern. They then inform you what file the pattern was found in and print the lines in which it occurred in each file. Preceding each line is the name of the file in which the line is located. grep can search for only one pattern, whereas fgrep can search for more than one pattern at a time. The grep and fgrep filters, along with their options, are described in Table 11-3.
The grep filter takes two types of arguments. The first argument is the pattern to be searched for; the second argument is a list of filenames, which are the files to be searched. You enter the filenames on the command line after the pattern. You can also use special characters, such as the asterisk, to generate a file list.
$ grep pattern filenames-list
In the next example, the grep command searches the lines in the preface file for the pattern "stream":
$ cat preface A text file in Unix consists of a stream of characters. An editor can be used to create such text files, changing or adding to the character data in the file. $ grep stream preface consists of a stream of
If you want to include more than one word in the pattern search, you enclose the words within single quotation marks. This is to quote the spaces between the words in the pattern. Otherwise, the shell would interpret the space as a delimiter or argument on the command line, and grep would try to interpret words in the pattern as part of the file list. In the next example, grep searches for the pattern "text file":
$ grep 'text file' preface A text file in Unix text files, changing or
If you use more than one file in the file list, grep will output the name of the file before the matching line. In the next example, two files, preface and intro, are searched for the pattern "data". Before each occurrence, the filename is output.
$ grep data preface intro preface: data in the file. intro: new data
As mentioned earlier, you can also use shell wildcard characters to generate a list of files to be searched. In the next example, the asterisk wildcard character is used to generate a list of all files in your directory. This is a simple way of searching all of a directory's files for a pattern.
$ grep data *
The special characters are often useful for searching a selected set of files. For example, if you want to search all your C program source code files for a particular pattern, you can specify the set of source code files with *.c. Suppose you have an unintended infinite loop in your program and you need to locate all instances of iterations. The next example searches only those files with a .c extension for the pattern "while" and displays the lines of code that perform iterations:
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