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In: Computers and Technology

Submitted By okcu2020
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UNIX for DBA`s

Author:

Sandeep Akkasani

1.

INTODUCTION TO UNIX
1.1

Single-User Systems
The personal computer (PC) is a small General-purpose system that can execute programs to perform a wide variety of tasks. The PC, however, was designed for use by one person at a time, that is, it is Single-User oriented with MS-DOS as the de facto standard operating system for this range of machines. Single user systems became very popular due to the low cost hardware and wide range of software available for these machines.

1.2

Multi-User Systems
As opposed to single-user systems there are also larger systems, which more than one person can use at any time. Such systems are referred to as multi-user systems.
Multi-user systems would be required when a number of applications have to be run simultaneously, or common resources, like printers and disks, are to be shared by a number of users.

1.3

Hardware – Multi-User Systems
While the hardware components of a multi-user system are similar to that of a singleuser system, the following differences should be noted.
The CPU of a multi-user system is more powerful and has capabilities to support multi-programming and multi-tasking, two features essential for multi-user systems.
The Hard disk of a multi-user system is bigger in capacity.
Most multi-user systems use magnetic tape as external storage for backup of software.
Single-user systems use floppies as the backup device. This is because multi-user systems have large hard disks, which have to be backed up quickly and conveniently.
Each user communicates with the system through a keyboard and a VDU – these are together referred to as the user terminal or node. A terminal may also be a PC or PCXT. The terminal is connected to the system unit by cables through RS232 ports.
The number of terminals varies between systems.
In multi-user

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