Book Image

Linux Shell Scripting Essentials

By : Sinny Kumari, Khem Raj
Book Image

Linux Shell Scripting Essentials

By: Sinny Kumari, Khem Raj

Overview of this book

Table of Contents (15 chapters)
Linux Shell Scripting Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Chapter 2. Getting Hands-on with I/O, Redirection Pipes, and Filters

In day-to-day work, we come across different kinds of files such as text files, source code files from different programming languages (for example, file.sh, file.c, and file.cpp), and so on. While working, we often perform various operations on files or directories such as searching for a given string or pattern, replacing strings, printing few lines of a file, and so on. Performing these operations is not easy if we have to do it manually. Manual searching for a string or pattern in a directory having thousands of files can take months, and has high chances of making errors.

Shell provides many powerful commands to make our work easier, faster, and error-free. Shell commands have the ability to manipulate and filter text from different streams such as standard input, file, and so on. Some of these commands are grep, sed, head, tr, sort, and so on. Shell also comes with a feature of redirecting output from one command to...