What is the use of SUID SGID STICKY BIT ACL and CHATTR

How to set set and remove above permissions

What is umask and how to set permanently

Command to change the owner and group of file

What is the of tar command

Command to archive and extract the files

How to archive with gzip

How to list the content of archive files

What is the use of SUDO

log files of sudo?

What are three all in sudoers files?

Configuration file of sudo?

What is wheel group in sudoers

what is the use of visudo command

Difference between sysmlink and hardlink

How to create symlink nd hardlink files

Explain fileds /etc/passwd and /etc/shadow file

How to check user password policy

Difference between useradd and usermod

What are the user types

UID range for normal user?

Command to change the uid of normal user

How to set password expiry

Command to lock the user account