…You may recall that back in the movie operators and arrays, I mentioned that…arrays are one of awk's most powerful…features and that I'd talk about them later.…Well, now it's later.…If you've used any other programming languages at all,…you are probably familiar with arrays with numeric subscripts.…Such as array sub 1, array sub 2 and so on.…As you've seen, awk handles this type of array quite well.…But this is just a special case of awk's array handling.…The fact is, that in awk, an array…subscript can be any number or string whatsoever.…
For example, we'll define a new array called a, and we'll assign…to its element first, that is a string, the value of field 1.…Likewise, we'll assign to the subscript second, the value of field 2.…And to third, the value of field 3.…Then we'll print them in reverse order.…We'll use the standard input for this, and so if we put in one, two, three,…you'll see that one is assigned to the…element of the array labeled with the subscript first.…
Two to second and three to third and these…
Author
Released
5/21/2014In this course, award-winning author and teacher David D. Levine shows you how to use AWK to read and write data in a variety of formats, produce reports, and automate repetitive tasks. He reviews the nuts and bolts of the language, such as field separators, pattern matching, variables, operators, expressions, and control structures; functions available for manipulating data; and integration with other programs like Excel.
- Determine what AWK is.
- Recognize how to write an AWK program.
- Determine how to use AWK command-line flags.
- Identify how to specify field and record separators with variables.
- Distinguish how to change a CVS file to a tab-separated one.
- Break down how to work with operators and arrays.
- Discover how to format output.
- Interpret how to string data with functions.
Skill Level Intermediate
Duration
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Introduction
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Welcome59s
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1. What Is AWK?
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What is AWK?3m 11s
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2. AWK Command Line Basics
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Writing an AWK program2m 51s
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Using AWK command-line flags6m 18s
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3. Understanding Records and Fields
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4. Understanding Variables and Operators
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5. A Quick Introduction to Regular Expressions
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Regular expression basics5m 19s
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6. Using Control Structures
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Building control structures4m 14s
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Creating an HTML table4m 45s
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7. Formatting the Output
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8. Functions and Arrays
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Manipulating strings7m 28s
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Using associative arrays4m 55s
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9. Combining AWK with Other Tools
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Using pipes7m 6s
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Scripting with AWK4m 56s
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Challenge: Perform a join1m 13s
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Solution: Perform a join2m 55s
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Conclusion
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Goodbye1m 10s
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Video: Using associative arrays