…So far most of the AWK programs that we've seen are very simple, performing…a basic operation like printing each line or perhaps only some lines from its input.…But AWK is a full-fledged programming language with a full complement…of control structures to control the flow of execution through a program.…AWK's Control Structures are generally similar…to those of C programming language.…The if statement executes a block of code…if, and only if, a certain condition is true.…The condition is any expression that can have a true or false value.…Conditional operators like = =, which tests…for numerical string of quality, or ~ which…tests for regular expression matching, are true…if the condition is true and false otherwise.…
A numeric value is considered false if its value is…0 and true if its value is anything other than 0.…String values are considered false if…they're the empty string and true otherwise.…The braces around the if statements are optional, if there's only…one statement, but it's very good practice to use braces every time.…
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: Building control structures