For security- every user needs to have an account and password. This also indicates who owns the files and directories on the system and what groups the users may belong to.
The account in Unix that has the most power is the administrative account 'root'. It can do anything on the system.
For the most part, every Unix-based and Unix-like (and by extension, Linux) distribution will have a root account (equivalent to a system administrator account in Windows). The remaining accounts will be allocated for the users and for certain applications.
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The root account. It can do anything on the computer.
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The UNIX OS is an operating system, which has the primary responsibility of managing security and resources for users. It has the same "purpose" as any other operating system, such as Windows, z/os, VMS, etc.
Unix web hosting is very reasonably priced and offers tons of other features. Unix can also offer you a domain name and help with setting everything up.
They are both administrator accounts and have privileges to do anything on the system.
Essentially, a command in Unix is a program that you execute for a certain purpose. It could be anything, from a shell script, to copying or deleting files, etc.
Unix is an multitasking, multi-user computer operating system developed by AT&T. It is currently owned by The Open Group. The Unix operating system was originally intended to be used for developing software.
This includes the presence of a switch or option - in this case the 'a' option. Every command in Unix is free to interpret what they means differently as there is no universal meaning for this switch.