The Data Wrangler's Handbook

Simple Tools for Powerful Results

Data manipulation and analysis are far easier than you might imagine-in fact, using tools that come standard with your desktop computer, you can learn how to extract, manipulate, and analyze data (and metadata) of any size and complexity. Les mer
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Om boka

Data manipulation and analysis are far easier than you might imagine-in fact, using tools that come standard with your desktop computer, you can learn how to extract, manipulate, and analyze data (and metadata) of any size and complexity. In this handbook, data wizard Banerjee will familiarize you with easily digestible but powerful concepts that will enable you to feel confident working with data. With his expert guidance, you'll learn how to

use a single-word command to sort files of any size by any criteria, identify duplicates, and perform numerous other common library tasks;
understand data formats, delimited text and CSV files, XML, JSON, scripting, and other key components of data;
undertake more sophisticated tasks such as comparing files, converting data from one format to another, reformatting values, combining data from multiple files, and communicating with APIs (Application Programming Interfaces);
save time and stress through simple techniques for transforming text, recognizing symbols that perform important tasks, a Regular Expression cheat sheet, a glossary, and other tools.


Library technologists and those involved in maintaining and analyzing data and metadata will find Banerjee's resource essential.

Fakta

Innholdsfortegnelse

List of Figures and Tables
Acknowledgments
Introduction
Chapter 1 Getting Started with the Command Line
Finding the Command Line
Mac
Windows
Meet the Command Line
Chapter 2 Command Line Concepts
Two Powerful Symbols
Direct Output to a File (Greater Than Symbol)
Direct Output to Another Program (Pipe Symbol)
Command Substitution
Regular Expressions-The Swiss Army Knife for Data
Literal Characters
Special Characters
Wildcard Characters
Logical Operators
Grouping
Scripting
Chapter 3 Understanding Formats, by David Forero
Chapter 4 Simplify Complicated Problems
Isolating Specific Data Elements
Converting Data into Formats That Are Easier to Work With
Chapter 5 Delimited Text
CSV (Comma Separated Values)
Commas and Quotation Marks in CSV Files
Multiline Fields in CSV Files
Multivalued Fields in Delimited Files
Chapter 6 XML
So What Is XML, Really?
What Makes XML So Useful?
Why Is XML So Easy?
DOM (Document Object Model)
XPath
XSLT (eXtensible Stylesheet Language Transformations)
Working with Large XML Files
Working with Complex XML Files
XmlStarlet
Installing XmlStarlet
Converting XML Documents
Chapter 7 JSON (JavaScript Object Notation)
Chapter 8 Scripting
Variables
Arguments
Conditional Execution
Loops
Chapter 9 Solving Common Problems
Viewing Large Files
Locating Files That Contain Particular Data
Finding Files with Specific Characteristics
Working with Internal Metadata
Working with APIs
Combining Data from Different Sources
Other Tasks
Chapter 10 Conclusions
One-Line Wonders
Locating, Viewing, and Performing Basic File Operations
Combine Information from Multiple Files into a Single File
Combine Three Files, Each Consisting of a Single Column into a Three-Column Table
Extract 1,000 Random Lines or Records from a File
Find Files with Specific Characteristics
Find All Lines in All Files in the Current Directory as Well as All Subdirectories Containing a Regular Expression
Identify All Files in Current Directories and Subdirectories That Contain a Value
List All Files in Current Directory and Subdirectories over a 100 MB in Order of Decreasing Size
List the Names, Pixel Dimensions, and File Sizes of All Files in the Current Directory and Subdirectories in Tab Delimited Format
Print Line Number of File That Match Occurred On
Split Large Files into Smaller Chunks with Each File Breaking on a Line
View 200 Characters Starting at Position 38562 in a File
View Lines 4369-4374 of a File
Retrieving and Sending Information over a Network
Retrieve a Document from the Web and Send It to a File
Send an XML Document to an API Requiring HTTP Authentication
Sorting, Counting, Deduplication, and File Comparison
Combine Two Files on a Common Field
Compare Two Sorted Files
Count Occurrences for Each Entry in a File, Listed in Order of Decreasing Frequency
Count Records Containing an Expression
Count Words, Lines, and Characters in Files
Identify All Unique Entries and Supply a Count of How Many Times Each Occurs
Sort a File and Remove Duplicates, Show Only Duplicated Entries, or Show Only Unique Entries
Useful Scripting Operations
Capture Parameters Passed to a Script
Divide a Line into Parameters
Iterate through Every Item in Parameter List
Perform a Loop
Perform an Operation Conditionally
Run a Script on Every Line of a File
Send the Output of a Command as Arguments to Another Command
Send the Output of a Command to Another Command
Send the Output of a Command to a File
Store the Output of a Command in a Variable
Use Foreign Character Sets in a Terminal Window
Transforming Text
Convert File of Dates to YYYY-MM-DD Format
Convert to Title Case
Convert to Upper Case
Convert List of Names from Direct Order to Indirect Order
Extract and Manipulate All Lines in a File That Match a Complex Pattern
Extract and Manipulate All Entries in All Files in an Entire Directory Hierarchy That Match a Pattern
Remove Lines from a File That Match a Pattern
Remove Carriage Return Characters Inserted by Windows Programs from a File
Remove Newline Characters from a File
Replace Newlines in a File with Character 7 (Bell)
Replace Search_Expr with Replace_Expr Only on Lines That Contain Condition_Expr
Replace Search_Expr with Replace_Expr Except on Lines That Contain Condition_Expr
Replace Smart Quotes with Straight Quotes
Working with Delimited Files
Convert Comma Delimited File Where Some Values Are Quoted and Some Values Are Not to Tab Delimited
Convert Multiline Records to Table
Extract Individual Fields from Files
Find the Most Common Values in the Second Field of a File
Find All Lines in Tab Delimited File Not Containing Six Fields
Fix Delimited File That Contains Line Breaks in Fields
Remove Trailing and Leading Whitespace from Tab Delimited Data Fields
Reorder Fields in a Tab Delimited File
Working with JSON and XML
Add an Attribute to an XML Document
Add an Element to an XML Document
Apply XSLT Stylesheet to XML Document
Convert JSON to Tab Delimited Format
Delete Elements, Attributes, or Values Based on XPath Expressions
Display Structure of XML File
Pretty Print JSON Document
Pretty Print XML Document
Glossary
Symbols That Perform Important Tasks
Useful Commands
Regular Expression Cheat Sheet
Index

Om forfatteren

Kyle Banerjee has wrangled data for diverse purposes in academic, government, and nonprofit environments since 1996. A firm believer that understanding people is the key to building services of the future from the systems and data of the past, his professional interests revolve around understanding workflows and identifying opportunities in data previously thought inconsistent or incomplete. He has published several books and numerous articles on a variety of topics related to applying technology in library settings.