What is RHEL 9? What are the key features of RHEL 9? What is the difference between RHEL and CentOS? What is SELinux in RHEL 9? What is the dnf package manager in RHEL 9? How can y... What is RHEL 9? What are the key features of RHEL 9? What is the difference between RHEL and CentOS? What is SELinux in RHEL 9? What is the dnf package manager in RHEL 9? How can you list installed packages using dnf? What is the default file system in RHEL 9? How do you check the RHEL 9 version? What is the systemctl command used for in RHEL 9? What is a systemd service in RHEL 9? How do you find the hardware details of a RHEL 9 system? What is the /etc/fstab file in RHEL 9? What is the default shell in RHEL 9? How do you create a new user in RHEL 9? How can you change a user's password in RHEL 9? What is the purpose of the /var/log/ directory in RHEL 9? How do you check system resource usage (CPU, memory) in RHEL 9? How do you update the system in RHEL 9? How do you add a repository in RHEL 9? What is the journalctl command used for? What is the lsblk command in RHEL 9? What is a cron job? How do you view the processes running on RHEL 9? What is the hostnamectl command used for in RHEL 9? What is the firewalld service in RHEL 9? What is the chmod command in RHEL 9? How do you check disk usage in RHEL 9? How do you mount a file system in RHEL 9? What is the yum command in RHEL 9? What is NMCLI in RHEL 9? What is the useradd command in RHEL 9? How do you set a password for a user in RHEL 9? What is the groupadd command used for? How do you add a user to a group in RHEL 9? How do you delete a user in RHEL 9? How do you delete a group in RHEL 9? What does the -G option do with useradd command in RHEL 9? What is /etc/passwd file in RHEL 9? What is the /etc/shadow file in RHEL 9? What is the /etc/group file in RHEL 9? What are supplementary groups in RHEL 9? How can you view a list of all users in RHEL 9? How do you change a user’s login shell in RHEL 9? What is the id command used for in RHEL 9? What is the groups command used for? What is the chown command in RHEL 9? What is the chmod command in RHEL 9? What does the -R option do in chown and chmod commands? What are file permissions in RHEL 9? How are file permissions represented in RHEL 9? How do you give execute permission to a file in RHEL 9? What is the difference between r, w, and x in file permissions? What is the umask command in RHEL 9? What is sticky bit in file permissions? What is the setuid permission in RHEL 9? What is the setgid permission in RHEL 9? What is the difference between symbolic and numeric modes in chmod? How do you change the default group for a user in RHEL 9? What is the passwd command used for in RHEL 9? How do you lock a user account in RHEL 9? What does the -f option do with the passwd command? How do you check user account expiration in RHEL 9? What is the /etc/sudoers file used for? How do you edit the /etc/sudoers file safely? What is the sudo command in RHEL 9? How do you view a user’s last login in RHEL 9? What is the chage command used for? How do you disable a user account temporarily in RHEL 9? How do you change the shell for a user in RHEL 9? What is the difference between hard and soft links in RHEL 9? What does the find command do in RHEL 9? How do you give read and write permissions to a file for all users in RHEL 9? What is the role of the /etc/skel directory? How can you check which users are logged in to the system? How can you set an account expiration date for a user in RHEL 9? What is the umask command used for in RHEL 9? What is the difference between a user’s UID and GID? How can you see a user’s password expiration details? How can you check the group memberships of a user in RHEL 9? How do you add a user with specific home directory and shell in RHEL 9?
Understand the Problem
The question set appears to be comprehensive inquiries regarding Red Hat Enterprise Linux 9 (RHEL 9), covering various topics such as commands, system management, user and group management, permissions, package management, and system security features.
Answer
RHEL 9 is an enterprise Linux OS; key features include enhanced security and performance. SELinux is a security feature, and CentOS is a free RHEL rebuild differing mainly in support.
RHEL 9 is the latest version of Red Hat Enterprise Linux, a Linux-based operating system designed for enterprise use. Key features include improved security, performance, and containerization support. SELinux is a security feature in RHEL 9. CentOS is a free rebuild of RHEL, used by developers and for testing, differencing mainly in support and licensing terms.
Answer for screen readers
RHEL 9 is the latest version of Red Hat Enterprise Linux, a Linux-based operating system designed for enterprise use. Key features include improved security, performance, and containerization support. SELinux is a security feature in RHEL 9. CentOS is a free rebuild of RHEL, used by developers and for testing, differencing mainly in support and licensing terms.
More Information
RHEL 9 provides improved support for container-based applications, optimized performance for cloud environments, and better system security features. SELinux in RHEL is crucial for enforcing security policies.
Tips
Misunderstanding the relationship between CentOS and RHEL is common—CentOS is community-supported and does not offer the official support levels that RHEL does.
Sources
- Red Hat Enterprise Linux 9 - Red Hat - redhat.com
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