Users and Groups
Provides introductions and tutorial on user and group management. Topics include commands to add and remove groups; commands to associate users with primary and supplementary groups; commands to file group ownership and group access permissions; commands to add and delete users; run 'sudo' command to gain 'roo' permision.
Manage User Groups
Group Access Permissions on Files
"sudo" Command and Privilege
"adduser/usermod/userdel" - Commands to Manage Users
- Use "groupadd" command to add a new explicitly.
- Use "usermod -g" command to change user's primary group.
- Use "gpasswd -a" command to assign supplementary group memership to a user.
- Use "getent group" command to view supplementary group members of a given group.
- Use "id" command to view primary group and supplementary groups of a given user.
- Use "chgrp" command to change group ownership of a given file.
- Use "chmod g=" command to change group access permissions of a given file.
- Use "wheel" or "sudo" group to grant "sudo" privilege.
- Use "sudo" command gain "root" permission for a given sub-command.
- Use "adduser" command to add a new user.
- Use "passwd" command to reset a user's password.
- Use "userdel" command to delete a user's login access and home directory.
Table of Contents
About This Book
Introduction to Linux Systems
Cockpit - Web Portal for Administrator
Files and Directories
►Users and Groups
Block Devices and Partitions
LVM (Logical Volume Manager)
SELinux - Security-Enhanced Linux
Network Connection on CentOS
Software Package Manager on CentOS - DNF and YUM
Running Apache Web Server (httpd) on Linux Systems
Running PHP Scripts on Linux Systems
Running MySQL Database Server on Linux Systems
Running Python Scripts on Linux Systems
vsftpd - Very Secure FTP Daemon
Postfix - Mail Transport Agent (MTA)
Dovecot - IMAP and POP3 Server
Email Client Tools - Mail User Agents (MUA)
LDAP (Lightweight Directory Access Protocol)
GCC - C/C++ Compiler
Conda - Environment and Package Manager
Tools and Utilities
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