last, chage, chsh, lsof, chown, chmod, useradd, userdel, newusers.
su command is used to change the user.
gpasswd -a Stewart wheel
There are no standardized commands for backing up a Linux system. Backup methods can range from dd to RAID to one of various backup utilities.
useradd
In linux adduser and useradd commands are used to add user account.
Accounting Process is the method of recording and summarizing commands executed on Linux. The modern Linux kernel is capable of keeping process accounting records for the commands being run, the user who executed the command, the CPU time, and much more.
The UPG (User Private Group) scheme in Linux is a method for managing user and group permissions where each user is assigned a unique private group with the same name as their username. This allows users to have their own group for file ownership, ensuring better security and collaboration since files created by a user belong to their private group by default. It simplifies permission management and enhances user isolation on multi-user systems. This scheme is commonly used in modern Linux distributions to facilitate user management.
utilities is nothing but predefined commands in linux
usermod -e, --expiredate EXPIRE_DATE The date on which the user account will be disabled. The date is specified in the format YYYY-MM-DD.
Linux is the kernel, from which many operating systems have branched out - Ubuntu and Linux Mint, to name but two. There is a Graphic User Interface (GUI) that allows a calculator to be used on the the desktop, or it is possible to calculate numbers using python terminal commands.
Innumerable. Remember that any program on Linux can be launched from the command line, so there are as many commands as there are programs.
The last answer to this was incorrect. Whether or not you are the only user on the system or not: Linux is always a multi-user operating system.