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Filters send their output to the standard output and so, by default, display their output on the screen. The simplest filters merely output the contents of files. You have already seen the cat commands. What you may not have realized is that cat is a filter. It receives lines of data and outputs a version of that data. The cat filter receives input and copies it out to the standard output, which, by default, is displayed on the screen. Commonly used filters are listed in Tables 11-3 and 11-4. Table 11-3: Filters Execution Displays a file. It can take filenames for its arguments. It outputs the contents of those files directly to the standard output, which, by default, is the screen. Copies the standard input to a file while sending it on to the standard output. It is usually used with another filter and enables you to save output to a file while sending the output on to another filter or utility. Displays the first few lines of a file. The default is ten lines,
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Table 11-3: Filters Execution but you can specify the number of lines. Displays the last lines in a file. The default is ten lines, but you can specify the number of lines $ tail filenames. Counts the number of lines, words, and characters in a file and outputs only that number. Counts the number of characters in a file. Counts the number of lines in a file. Counts the number of words in a file. Checks the spelling of each word in a file and outputs only the misspelled words. Outputs a sorted version of a file. Compares two files, character by character, checking for differences. Stops at the first difference it finds and outputs the character position and line number. Compares two files, line by line, and outputs both files according to lines that are similar and different for each. Searches files for a pattern and lists any matched lines. Ignores uppercase and lowercase differences. Only outputs a number-the count of the lines with the pattern. Displays the names of the files that contain the matching pattern. Outputs the line number along with the text of those lines with the matching pattern. Outputs all those lines that do not contain the matching pattern. Searches files in the file list for several patterns at the same time. Executes much faster than either grep or egrep; however, fgrep cannot interpret special characters and cannot search for regular expressions. Searches files in the file list for the occurrence of a pattern. Like fgrep, it can read patterns from a file. Like grep, it can use regular expressions, interpreting special characters. However, unlike grep, it can also interpret extended special characters such as , |, and +. Outputs a paginated version of the input, adding headers, page numbers, and any other specified format. Copies files to an archive and extracts files from an archive. Has two modes of operation: one using the -o option to copy files to an archive and the other using the -i option to extract files from an archive. When copying files to an archive, you need first to generate the list of filenames using a command such as ls or find.
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Command sed editing-command file-list
Table 11-4: Edit Filters Execution Outputs an edited form of its input. sed takes as an argument an editing command and a file list. The editing command is executed on input read from files in the file list. sed then outputs an edited version of the files. The editing commands are line editing commands similar to those used for the Ed line editor. With this option, sed does not output lines automatically. This option is usually used with the p command to output only selected lines. With this option, sed reads editing commands filename. (You need to quote any newline characters if you are entering more than one line) Appends text after a line. Inserts text before a line. Changes text. Deletes lines. Prints lines. Writes lines to a file. Reads lines from a file. Quits the sed editor before all lines are processed. Skips processing to next line. Substitutes matched pattern with replacement text. Global substitution on a line. Outputs the modified line. Writes the modified line to a file. A line can be located and referenced by a pattern. Compares two files and outputs the lines that are different as well as the editing changes needed to make the first file the same as the second file. Appends lines from file2 to after f1-linenum in file1. Deletes the lines in file1. Replaces lines in file1 with lines in file2. Ignores any trailing or duplicate blank. Outputs a context for differing lines. Three lines above and below are displayed. Outputs a list of Ed editing commands that, when executed, change the first file into an exact copy of the second file. Outputs a version of the input in which characters in the first
f filename Line Commands a i c d p w r q n s/pattern/replacement/ g s/pat/rep/g p s/pat/rep/p w s/pat/rep/w fname /pattern/ diff filename filename
f1-linenum a f2-line1, f2-line2 f1-line1, f1-line2 d f1-linenum f1-line1, f1-line2 c f2-line1, f2-line2 b c e tr first-character-list
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