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.
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.
Innumerable. Remember that any program on Linux can be launched from the command line, so there are as many commands as there are programs.
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.
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.
ls