Book Image

Linux Shell Scripting Cookbook, Second Edition - Second Edition

Book Image

Linux Shell Scripting Cookbook, Second Edition - Second Edition

Overview of this book

The shell remains one of the most powerful tools on a computer system — yet a large number of users are unaware of how much one can accomplish with it. Using a combination of simple commands, we will see how to solve complex problems in day to day computer usage.Linux Shell Scripting Cookbook, Second Edition will take you through useful real-world recipes designed to make your daily life easy when working with the shell. The book shows the reader how to effectively use the shell to accomplish complex tasks with ease.The book discusses basics of using the shell, general commands and proceeds to show the reader how to use them to perform complex tasks with ease.Starting with the basics of the shell, we will learn simple commands with their usages allowing us to perform operations on files of different kind. The book then proceeds to explain text processing, web interaction and concludes with backups, monitoring and other sysadmin tasks.Linux Shell Scripting Cookbook, Second Edition serves as an excellent guide to solving day to day problems using the shell and few powerful commands together to create solutions.
Table of Contents (16 chapters)
Linux Shell Scripting Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Checking disks and filesystems for errors


Data is the most important thing in any computer system. Naturally, it is important to monitor the consistency of data stored on physical media.

Getting ready

We will use the standard tool, fsck to check for errors in the filesystems. This command should be preinstalled on all modern distros. If not, use your package manager to install it.

How to do it...

Let us see how to use fsck with its various options to check filesystems for errors, and optionally fix them.

  1. To check for errors on a partition or filesystem, just pass its path to fsck:

    # fsck /dev/sdb3
    fsck from util-linux 2.20.1
    e2fsck 1.42.5 (29-Jul-2012)
    HDD2 has been mounted 26 times without being checked, check forced.
    Pass 1: Checking inodes, blocks, and sizes
    Pass 2: Checking directory structure
    Pass 3: Checking directory connectivity
    Pass 4: Checking reference counts
    Pass 5: Checking group summary information
    HDD2: 75540/16138240 files (0.7% non-contiguous), 48756390/64529088 blocks
    
  2. To check...