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CentOS System Administration Essentials

You're reading from   CentOS System Administration Essentials Become an efficient CentOS administrator by acquiring real-world knowledge of system setup and configuration

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Product type Paperback
Published in Nov 2014
Publisher Packt
ISBN-13 9781783985920
Length 174 pages
Edition 1st Edition
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Author (1):
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Andrew Mallett Andrew Mallett
Author Profile Icon Andrew Mallett
Andrew Mallett
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Toc

Table of Contents (13) Chapters Close

Preface 1. Taming vi 2. Cold Starts FREE CHAPTER 3. CentOS Filesystems – A Deeper Look 4. YUM – Software Never Looked So Good 5. Herding Cats – Taking Control of Processes 6. Users – Do We Really Want Them? 7. LDAP – A Better Type of User 8. Nginx – Deploying a Performance-centric Web Server 9. Puppet – Now You Are the Puppet Master 10. Security Central 11. Graduation Day Index

Special permissions

The permissions or mode of a file you we will be familiar with is Read, Write, and eXecute (RWX). These permissions can be set to the three objects:

  • User
  • Group
  • Others

The standard permissions are shown with their octal notation, should you want a quick revision exercise, as follows:

Special permissions

There is a fourth block of permissions that precedes user, group, and others. This block is for the special permissions; however, rather than representing RWX, the permissions comprise of:

  • The set user ID (SUID) bit
  • The set group ID (SGID) bit
  • The sticky bit

Using symbolic notations, these permissions can be added to file1, which acts as our axiom for the filename during the following demonstration:

$ chmod u+s file1 #adding the SUID Bit
$ chmod g+s file1 #adding the SGID Bit
$ chmod o+t file1 #adding the Sticky Bit

The SUID bit

The set user ID bit is used when a program needs to run using another user ID other than the user running the program. When set, the program runs with the permissions of the...

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