Book Image

Hands-On Data Science with the Command Line

By : Jason Morris, Chris McCubbin, Raymond Page
Book Image

Hands-On Data Science with the Command Line

By: Jason Morris, Chris McCubbin, Raymond Page

Overview of this book

The Command Line has been in existence on UNIX-based OSes in the form of Bash shell for over 3 decades. However, very little is known to developers as to how command-line tools can be OSEMN (pronounced as awesome and standing for Obtaining, Scrubbing, Exploring, Modeling, and iNterpreting data) for carrying out simple-to-advanced data science tasks at speed. This book will start with the requisite concepts and installation steps for carrying out data science tasks using the command line. You will learn to create a data pipeline to solve the problem of working with small-to medium-sized files on a single machine. You will understand the power of the command line, learn how to edit files using a text-based and an. You will not only learn how to automate jobs and scripts, but also learn how to visualize data using the command line. By the end of this book, you will learn how to speed up the process and perform automated tasks using command-line tools.
Table of Contents (8 chapters)

Math in bash itself

Bash itself is able to do simple integer arithmetic. There are at least three different ways to accomplish this in bash.

Using let

You can use the let command to do simple bash arithmetic:

$ let x=1
$ echo $x
$ let x=$x+1
$ echo $x

Basic arithmetic

You can do addition, subtraction, multiplication (be sure to escape the * operator with \*) and integer division:

expr 1 + 2
expr 3 \* 10

The numbers must be separated by spaces.