Olushile Paul / Олушиле Пол - Essential Linux Commands: 100 Linux commands every system administrator should know / Основные команды Linux: 100 команд Linux, которые должен знать каждый системный администратор [2023, PDF, EPUB, ENG]

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Preface xiii
Part 1: Server Installations and
Management Commands
1
Getting a CentOS
Server Up and Running 3
Downloading the OS installation
file 4
Downloading and setting up a
hypervisor 7
Package installation commands 28
YUM package management system 28
Common package installation
commands 29
Information commands 30
Summary 32
2
Linux User and Group Commands 33
useradd, userdel, and usermod 34
useradd 34
userdel 36
usermod 38
Files, directories, and permission
commands 40
chmod 41
chown 41
chgrp 41
groupdel, groupmod, groupadd,
and grpck 42
pwck, chage, and passwd
commands 44
find, locate, and whereis
commands 48
Summary 50
3
File Compression and Archival Commands 51
gunzip and gzip 52
tar, rar, and unrar 55
zip and unzip 57
bunzip2, bzip2, and more 58
Summary 63
Part 2: Frequently Used Commands - Part 1
4
Format and Disk Space Commands 67
The history and evolution of disk
formatting and partitioning in
Linux 68
Steps to create a partition 69
fdisk, lsblk, df, and du 73
Checking the disk space usage of a
directory 75
Finding large files in a directory 76
Displaying (dpkg and rpm)
package space 76
Installing a package 77
Querying the details of a package 77
mkfs, mke2fs, fdformat, and
more 78
Summary 84
5
Linux Permissions Commands 87
Why permission commands? 88
Types of permissions 89
chmod 90
chown 94
Utilizing absolute paths in
commands 96
chgrp 98
umask 99
sudo 101
Summary 103
6
Filesystem Mount and Manipulation Commands 105
Linux mount commands 106
The mount command 106
The umount command 109
The fuser command 111
File manipulation using cat,
grep, and more 114
Summary 117
Part 3: Frequently Used Commands - Part 2
7
File Content and Conversion Commands 121
The tail and file commands 122
The convert command 124
Using dos2unix to convert MS-DOS
files to Unix 127
Using unix2dos to convert Unix
files to MS-DOS 129
The recode command 131
Summary 132
8
Linux SWAP Commands 133
The swapon command 134
The free command 136
Summary 138
9
Linux Monitoring and Debugging Commands 139
The top command 140
The ps command 143
The pstree command 145
The strace command 146
The watch command 148
The smartctl command 148
The uptime command 149
The lsof command 150
The lsmod command 151
The last reboot command 153
The last command 153
The w command 154
The vmstat command 154
The kill command 156
The pkill command 157
Summary 158
10
Linux IPTABLES and Network Commands 159
iptables -t ACCEPT 160
iptables -t DROP 162
ifconfig, ip, route, and netstat 163
ip, route, and netstat 163
Hostname and nslookup 165
host 167
Summary 168
11
File Transfer, Downloading, and Managing Log Files 169
Copying files into remote systems
using netcat and socat 170
Downloading files with wget and curl 173
Exploring common log files 175
Summary 178
Part 4: Linux Security and the Cloud
12
Exploring Linux Security 181
Utilizing enforcing and permissive
modes 182
A short introduction to Linux hardening and
the role of SELinux’s enforcing and passive
modes 183
The role of enforcing mode 183
The role of permissive mode 183
Enabling or disabling SELinux
Boolean values 184
Searching for a Boolean and getting its
information 186
Enabling a SELinux Boolean value 187
Disabling a SELinux Boolean value 187
Locking user accounts 188
Securing SSH 189
Summary 192
13
Linux in the Cloud 193
Creating EC2 instances on AWS 194
Connecting to a created EC2
instance using PuTTY 207
Working on our EC2 instance 212
Summary 218
Index 219
Other Books You May Enjoy 228