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Redirects file contents to standard input. Appends file contents to standard input.
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bash also has logical operators, including the less than (lt) operator, which uses the test facility to make numerical comparisons between two operands. Other commonly used operators include the following:
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Let s look at an example with the cat command, which displays the contents of files, and the echo command, which echoes the contents of a string or an environment variable that has been previously specified. For example, imagine that you want to maintain a database of endangered species in a text file called animals.txt. If you want to add the first animal zebra to an empty file, you could use this command:
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$ echo "zebra" > animals.txt
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You could then check the contents of the file animals.txt with this command:
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$ cat animals.txt zebra
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Thus, the insertion was successful. Now, imagine that you want to add a second entry (the animal emu ) to the animals.txt file. You could try using this command:
$ echo "emu" > animals.txt
However, the result may not be what you expected:
$ cat animals.txt emu
You get this result because the > operator always overwrites the contents of an existing file, whereas the >> operator always appends to the contents of an existing file. Let s run that command again with the correct operators:
$ echo "zebra" > animals.txt $ echo "emu" >> animals.txt
6:
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This time, the output is just what we expected:
$ cat animals.txt zebra emu
Once you have a file containing a list of all the animals, you would probably want to sort it alphabetically, which simplifies searching for specific entries. To do this, you can use the sort command:
$ sort animals.txt emu zebra
The sorted entries are then displayed on the screen in alphabetical order. You can also redirect the sorted list into another file (called sorted_animals.txt) by using this command:
$ sort animals.txt > animals_sorted.txt
If you want to check that the sorting process actually worked, you could compare the contents of the animals.txt file line by line with the sorted_animals.txt file, by using the diff command:
$ diff animals.txt sorted_animals.txt 1d0 < zebra 2a2 > zebra
This result indicates that the first and second lines of the animals.txt and sorted_ animals.txt files are different, as expected. If the sorting process had failed, the two files would have been identical, and no differences would have been reported by diff. A related facility is the basename facility, which is designed to remove file extensions from a filename specified as an argument. This is commonly used to convert files with one extension to another extension. For example, imagine that you have a graphics file conversion program that takes as its first argument the name of a source JPEG file, and takes the name of a target bitmap file. Somehow, you need to convert a filename of the form filename.jpg to a file of the form filename.bmp. You can do this with the basename command. In order to strip a file extension from an argument, you need to pass the filename and the extension as separate arguments to basename. For example, the command
$ basename maya.gif .gif
Part II:
System Essentials
produces this output:
maya
If you want the .gif extension to be replaced by a .bmp extension, you could use the command
$ echo `basename maya.gif`.bmp
to produce the following output:
maya.bmp
Of course, you are not limited to extensions like .gif and .bmp. Also, keep in mind that the basename technique is entirely general and because Solaris does not have mandatory filename extensions, you can use the basename technique for other purposes, such as generating a set of strings based on filenames.
Procedures
The following procedures are required for advanced text processing.
sed and awk
So far, we ve looked at some fairly simple examples of text processing. However, the power of Solaris-style text processing lies with advanced tools like sed and awk. sed is a command-line editing program that can be used to perform search-and-replace operations on very large files, as well as to perform other kinds of noninteractive editing. awk, on the other hand, is a complete text-processing programming language that has a C-like syntax and can be used in conjunction with sed to program repetitive text-processing and editing operations on large files. These combined operations include double- and triple-spacing files, printing line numbers, left- and right-justifying text, performing field extraction and field substitution, and filtering on specific strings and pattern specifications. We examine some of these applications shortly. To start this example, create a set of customer address records stored in a flat-text, tab-delimited database file called test.dat:
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