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

Viewing and managing processes using the top command

The top command, which means table of processes, is similar in nature to Windows Task Manager. You will find a wide variety of Linux distributions that support the top command. The top command is essentially used to derive the system's CPU and memory utilization. The output is structured by creating a list of running processes selected by user-specified criteria; the output is in real time. The PID for each process is listed in the first column. Let's fire it up:

[philip@localhost ~]$ top
top - 12:50:44 up 5 days, 11:44, 2 users, load average: 0.01, 0.02, 0.05
Tasks: 165 total, 1 running, 164 sleeping, 0 stopped, 0 zombie
%Cpu(s): 12.1 us, 1.4 sy, 0.0 ni, 86.1 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st
KiB Mem : 999696 total, 95804 free, 633636 used, 270256 buff/cache
KiB Swap: 2097148 total, 1852900 free...