…AWK provides a large library of string manipulation functions.…Here are some of the most useful.…Note that AWK always numbers characters within strings beginning at one.…For example, in the string Snoopy the s is…character number one and the p is character number five.…The first and most useful string manipulation function is length…which simply returns the length of the specified string in characters.…If you omit the string argument, length returns the length of $0, the whole line.…
Index looks for the string target within…the string string and returns the location within…the string where the first occurrence was found or zero if it is not found.…For example, index looking for…blish within the string antidisestablishmentarianism returns…12 because blish begins at the 12th character of the word.…The function match is similar to index but it…looks for a regular expression rather than a simple string.…In addition to returning the location in the string where the first match…was found, it also sets the variable RSTART to the location of the match.…
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: Manipulating strings