Deck 13: Unix Operating System

Question 1

The immediate goals for UNIX were twofold, to develop an operating system that would support software development, and to keep its algorithms as simple as possible.

Answer 1

True

Question 2

Each physical device in UNIX is identified by a minor device number, a major device number, and a contact address.

Answer 2

False

Question 3

The UNIX I/O system is divided into the "block I/O" system and the "interactive I/O" system.

Answer 3

False

Question 4

In UNIX the process table is set up when the process is created and is deleted when the process terminates.

Question 5

While Linux and UNIX are different operating systems, they strongly resemble each other in many ways.

Question 6

The portability of UNIX is attributed to the fact that most of it is written in a high-level language, C++.

Question 7

The UNIX process scheduling algorithm picks the process that will run in the shortest amount of time to be run first.

Question 8

The Processor Manager of a UNIX system kernel handles the allocation of the CPU, process scheduling, and the satisfaction of process requests.

Question 9

The UNIX kernel does not reside in memory permanently, it can be swapped out when needed to provide more space for applications.

Question 10

UNIX can be mastered by novice programmers in a matter of weeks.

Question 11

By 1990, there were about two dozen versions of UNIX, among them AT&T's UNIX System V.

Question 12

Demand paging requires more complicated hardware configurations; it increases the system overhead and under heavy loads might lead to thrashing.

Question 13

The exec family of commands-execl, execv, execls, execlp and execvp-is used to start execution of a new program from another program.

Question 14

In 1991, AT&T's Unix System Laboratories developed System V release 6, which incorporated almost all of the features found in System V release 3.

Question 15

Swapping uses a round robin policy.

Question 16

UNIX Version 4 was hardware independent.

Question 17

UNIX is a true multitasking operating system.

Question 18

UNIX has grown to become one of the most widely used operating systems in history.

Question 19

UNIX is designed to ensure device dependence to the applications running under it.

Question 20

The system command, split, splits a program into two copies, which are both running from the statement after the command.

Question 21

The UNIX file management system organizes the disk into blocks of 1024 bytes each and divides the disk into four basic regions.

Question 22

When using a terminal, as the user types in each character, it is collected in the ____ queue.

A) raw input
B) canonical input
C) character
D) buffer

Question 23

When the UNIX Processor Manager is deciding which process from the READY queue will be loaded into memory to be run first, it chooses the process ____.

A) with the lowest priority
B) which has been waiting longest
C) with the lowest amount of time remaining to execute
D) with the longest time spent on the secondary storage

Question 24

In UNIX, the file ____ contains the parameters that control resources such as the number of internal buffers for the kernel and the size of the swap space.

A) config.sys
B) conf.ini
C) ctrl.conf
D) conf.c

Question 25

____ is a family of IEEE standards that define a portable operating system interface to enhance the portability of programs from one operating system to another.

A) POSIX
B) POSFIX
C) LINUX
D) STD

Question 26

The command ____ is used to find a specified string of characters in a file.

A) cp
B) mv
C) grep
D) ls

Question 27

The ____ command allows the programmer to synchronize process execution by suspending the parent until the child is finished.

A) exec
B) fork
C) wait
D) pause

Question 28

The second column in a directory listing indicates the number of links, also known as the number of aliases, that refer to the same physical file.

Question 29

A pipe is the operating system's way to connect the output from one program to the input of another without the need for temporary or intermediate files.

Question 30

the first official version of UNIX introduced was in ____.

A) 1969
B) 1971
C) 1973
D) 1981

Question 31

A disadvantage of Linux and UNIX is ____.

A) They are device dependent.
B) Programmers do not like using the interface.
C) It is difficult for novice users to learn.
D) It is not portable from smaller to larger systems.

Question 32

UNIX uses a ____ to keep track of which processes are using which program code, and the memory is not released until the program code is no longer needed.

A) pointer
B) text table
C) binary file
D) database

Question 33

For multiprogramming systems, most UNIX operating systems use either ____ management techniques.

A) indirect paging and hot swapping
B) simple memory and paging
C) virtual memory and swapping
D) swapping or demand paging memory

Question 34

UNIX uses the ____ page replacement algorithm.

A) least recently used
B) round robin
C) priority
D) oldest first

Question 35

The C shell is usually available as an unbundled product.

Question 36

Subroutines that work with the operating system to supervise the transmission of data between main memory and a peripheral unit are called the ____.

A) device controllers
B) device drivers
C) control drivers
D) controllers

Question 37

In UNIX, a ____ table is allocated to each active process.

A) process
B) subtext
C) user
D) database

Question 38

There is no return from a successful ____ call.

A) nest
B) exec
C) duplicate
D) fork

Question 39

A ____ may occur if an event happens during the process's transition between deciding to wait for the event and entering the WAIT state.

A) race
B) deadlock
C) starvation
D) synchronization problem

Question 40

UNIX stores files as sequences of bytes and does not impose any structure on them.

Question 41

If a program's execution is expected to take a long time, you can start its execution and then log off the system without having to wait for it to finish by using the command ____.

A) fin
B) finproc
C) keep
D) nohup

Question 42

The following command ____ will store the names of all users logged on to the system in the file called temporary.

A) ls user temporary
B) who > temporary
C) users > temporary
D) view users temporary

Question 43

The command ____ is used to lower the priority of a process.

A) lp
B) set priority
C) nice
D) low

Question 44

The UNIX file management system organizes the disk into blocks of 512 bytes each and divides the disk into four basic regions, the first of which is ____.

A) contains the size of the disk and the boundaries of the other regions
B) free blocks available for file storage
C) a list of file definitions
D) reserved for booting

Question 45

A ____ is several programs simultaneously processing the same I/O stream.

A) pipeline
B) pipe
C) filter
D) redirect

Question 46

The following command ____ , will copy the contents of chapt1 and chapt2 into a file named sectiona.

A) chapt1, chapt2 < sectiona
B) cp chapt1 sectiona, cp chapt2 sectiona
C) cat chapt1 chapt2 > sectiona
D) ls chapt1, chapt2, sectiona

Question 47

The ____ command is used to delete a file or directory.

A) rm
B) mv
C) del
D) erase

Question 48

____ are the device drivers that provide the interface to I/O hardware.

A) Dev files
B) Dev drivers
C) Special files
D) Store files

Question 49

The maximum number of bytes that can be allocated to a single file in UNIX is ____.

A) 128
B) 16,522
C) 2,113,674
D) 1,082,201,088

Question 50

Using ____ in a path name will move you upward in the hierarchy.

A) /
B) ..
C) .
D) ^