Join David D. Levine for an in-depth discussion in this video Solution: Print only those lines consisting of a complete HTML entity, part of AWK Essential Training.
…The challenge in this case is to print from an…HTML file only lines that consist of complete HTML entities.…That is, lines that begin with an HTML…tag, and end with the corresponding closing tag.…This is one possible solution.…In the Begin section, we set the Field Separator to a regular expression, which…consists of a single character which is…either an opening or a closing angle bracket.…Let me show you the effect that this has on an HTML line.…
This line begins with the <li> and ends with the </li>.…With the field separator, bracket, angle bracket, angle…bracket bracket, which specifies a single character which is…either an opening or a closing angle bracket,…the number of fields in this case is nine.…The first one is an empty field, which is the no characters…that exist between the beginning of the line and the opening angle bracket.…The second field is the li.…The third field this is a, fourth field is the…i, fifth is list, sixth is the slash i, seventh…is space item, eighth is the slash li, and the…ninth field is the empty field after the closing angle bracket.…
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: Solution: Print only those lines consisting of a complete HTML entity