Book Image

CompTIA Linux+ Certification Guide

By : Philip Inshanally
Book Image

CompTIA Linux+ Certification Guide

By: Philip Inshanally

Overview of this book

The Linux+ certification provides a broad awareness of Linux operating systems, while giving professionals an upper hand in the IT industry. With this certification, you’ll be equipped with the all-important knowledge of installation, operation, administration, and troubleshooting services. This CompTIA Linux+ Certification Guide will give you an overview of the system architecture. You’ll understand how to install and uninstall Linux distributions, followed by working with various package managers. You’ll then move on to manipulating files and processes at the command-line interface (CLI) and creating, monitoring, killing, restarting, and modifying processes. As you progress, you’ll be equipped to work with display managers and learn how you can create, modify, and remove user accounts and groups, as well as understand how to automate tasks. The last set of chapters will help you configure dates and set up local and remote system logging. In addition to this, you’ll explore different internet protocols, and delve into network configuration, security administration, Shell scripting, and SQL management. By the end of this book, you’ll not only have got to grips with all the modules you need to study for the LX0-103 and LX0-104 certification exams, but you’ll also be able to test your understanding with practice questions and mock exams.
Table of Contents (23 chapters)
19
Mock Exam - 1
20
Mock Exam - 2

Managing groups

So far, we've been creating user accounts within our system; what about group accounts? Well, here's the thing, when we create an account using the useradd command, we are also indirectly creating a group account using the same name as the user. To prove this, let's take a look at the /etc/login.def file:

root@ubuntu:/home/philip# cat /etc/login.defs | grep GRO
# TTYGROUP Login tty will be assigned this group ownership.
# which owns the terminals, define TTYGROUP to the group number and
# TTYPERM to 0620. Otherwise leave TTYGROUP commented out and assign
TTYGROUP tty
# If USERGROUPS_ENAB is set to "yes", that will modify this UMASK default value
USERGROUPS_ENAB yes
#CONSOLE_GROUPS floppy:audio:cdrom
root@ubuntu:/home/philip#

Based on the preceding output, the USERGROUPS_ENAB yes variable enables...