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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

By : Sinny Kumari
4.5 (2)
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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

4.5 (2)
By: Sinny Kumari

Overview of this book

Shell scripting is a quick method to prototype complex applications or problems. Shell scripts are a collection of commands to automate tasks, usually those for which the user has a repeated need, when working on Linux-based systems. Using simple commands or a combination of them in a shell can solve complex problems easily. This book starts with the basics, including essential commands that can be executed on Linux systems to perform tasks within a few nanoseconds. You’ll learn to use outputs from commands and transform them to show the data you require. Discover how to write shell scripts easily, execute script files, debug, and handle errors. Next, you’ll explore environment variables in shell programming and learn how to customize them and add a new environment. Finally, the book walks you through processes and how these interact with your shell scripts, along with how to use scripts to automate tasks and how to embed other languages and execute them.
Table of Contents (10 chapters)
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9
Index

Chapter 6. Working with Files

For simplicity, everything in UNIX and Linux-based operating systems is treated as a file. Files in the filesystem are arranged in a hierarchical tree like a structure with the root of the tree denoted by '/' (forward slash). A node of the tree is either a directory or file where the directory is also a special type of file containing inode numbers and a corresponding filename entry of the list of files inside it. An inode number is an entry in an inode table that contains metadata information related to the file.

In this chapter, we will take a closer look at the important and commonly used file types. We will see how we can create, modify, and perform other useful operations on files. We will also see how to monitor a list of files opened by a process or user.

This chapter will cover the following topics in detail:

  • Performing basic file operations
  • Moving and copying files
  • Comparing files
  • Finding files
  • Links to a file
  • Special files
  • Temporary files...
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