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$ sed q < test.dat Bloggs Joe 24 City Rd
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If you want to print a certain number of lines, you can use sed to extract the first q lines:
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$ sed 2q < test.dat Bloggs Joe 24 City Rd Lee Yat Sen 72 King St
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The grep command is often used to detect strings within files. However, you can also use sed for this purpose, as shown in the following example, where the string CA (representing California) is searched for:
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$ cat test.dat | sed '/CA/!d' Rowe Sarah 3454 Capitol St Los Angeles
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However, this is a fairly gross and inaccurate method, because CA might match a street address like 1 CALGARY Rd , or 23 Green CAPE . Thus, you need to use the field-extraction features of awk. In the following example, use awk to extract and print the fifth column in the data file, representing the state:
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$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $5}' VA MA CA NY
Note that the tab character (\t) is specified as the field delimiter. Now, if you combine the field-extraction capability of awk with the string-searching facility of sed, you should be able to print out a list of all occurrences of the state CA:
$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $5}' | sed '/CA/!d' CA
or, you could simply count the number of records that contain CA in the state field:
$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $5}' | sed '/CA/!d' \ | sed -n '$=' 1
When you are producing reports, selectively displaying fields in a different order is useful. For example, although surname is typically used as a primary key, and is generally
Part II:
System Essentials
the first field, most reports would display the first name before the surname, which you can achieve by using awk:
$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $2,$1}' Joe Bloggs Yat Sen Lee Sarah Rowe Akira Sakura
You can also split such reordered fields across different lines, and use different format specifiers. For example, the following script prints the first name and surname on one line, and the state on the following line. Such code is the basis of many mail-merge and bulk-printing programs.
$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $2,$1,"\n"$5}' Joe Bloggs VA Yat Sen Lee MA Sarah Rowe CA Akira Sakura NY
Because awk is a complete programming language, it contains many common constructs, like if/then/else evaluations of logical states. These states can be used to test business logic cases. For example, in a mailing program, you could check the bounds of valid ZIP codes by determining whether the ZIP code lay within a valid range. For example, the following routine checks to see whether a ZIP code is less than 9999, and rejects it as invalid if it is greater than 9999:
$ cat test.dat | awk 'BEGIN {FS = "\t"}{print $2,$1}{if($6<9999) \ {print "Valid zipcode"} else {print "Invalid zipcode"}}' Joe Bloggs Invalid zipcode Yat Sen Lee Valid zipcode Sarah Rowe Invalid zipcode Akira Sakura Invalid zipcode
PERL Programming
PERL stands for the Practical Extraction and Reporting Language, and was originally developed by Larry Wall. One of the things that developers really like about PERL is how quickly it is possible to write a full-blown application literally within a few
6:
Te x t P r o c e s s i n g a n d E d i t i n g
minutes. When teamed up with the Common Gateway Interface (CGI) provided by Web servers such as Apache, PERL provides an easy way to write applications that can be executed on a server when requested by a client. This means that HTML pages can be generated dynamically by a PERL application and streamed to a client. Coupled with PERL s database access libraries (known as the PERL Database Interface, or DBI), PERL can be used to create multitiered applications, which is especially useful for system-management applications. To create a PERL application, simply follow these five steps: 1. Create a text file by using the vi editor or pico editor. 2. Give the file executable permissions, by using the chmod command. 3. Instruct the shell to execute the PERL interpreter by including a directive in the first line of the script. 4. Write the PERL code. 5. Run the application. As an example, let s create a PERL program that simply prints a line of text to the screen (for example, the string Hello World! ). First, create a file called helloworld.pl by using the command touch:
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