Join David D. Levine for an in-depth discussion in this video Using pipes, part of AWK Essential Training.
…Unix operating systems use the idea of a pipe to…connect the output of one program to the input of another.…Which let's you string together small, general…purpose tools to perform various tasks without programming.…For example, back in the movie about associative arrays, I showed you…an AWK program to count the occurrences of each word in its input.…It was a program called wordusage.awk.…We'll take our dukeofyork.txt input.…And you see it produces a count of the…number of times each word was found in the input.…
It comes out in arbitrary order because we…used the for in loop to produce the output.…If we wanted to sort this output alphabetically, we don't…have to go back and add code to the program.…Instead, you can just pipe the output of AWK, do…the sort command which sorts its output alphabetically by default.…Another very common pipe is to add the more…command to display the output one screenful at a time.…So, here we see the beginning of the alphabetical output, followed by a…prompt indicating to press the space bar to see the rest of it.…
Author
David D. Levine
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
Views
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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 pipes