Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows:

"The following command collects the /dev/sda1 volume, stores it in a file called sda1.img".

A block of code is set as follows:

hdfs dfs -put ./testFile.txt /home/hadoopFile.txt
hdfs dfs –get /home/hadoopFile.txt ./testFile_copy.txt
md5sum testFile.txt
md5sum testFile_copy.txt

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

hdfs dfs -put ./testFile.txt /home/hadoopFile.txt
hdfs dfs –get /home/hadoopFile.txt ./testFile_copy.txt
md5sum testFile.txt
md5sum testFile_copy.txt

Any command-line input or output is written as follows:

#!/bin/bash
hive -e "show tables;" > hiveTables.txt
for line in $(cat hiveTables.txt) ;
do
hive -hiveconf tablename=$line -f tableExport.hql > ${line}.txt
done

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Enter the Case Number and Examiner information, and click Next."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.