Deck 13: Unix Operating Systems

Question 1

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

Answer 1

False

Question 2

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

Answer 2

True

Question 3

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

Answer 3

True

Question 4

In UNIX,swapping uses a round robin memory-management policy.

Question 5

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

Question 6

A strength of UNIX is its true multitasking capabilities.

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

Demand paging requires more complicated hardware configurations than swapping in that it increases the system overhead and under heavy loads,might lead to thrashing.

Question 15

UNIX and Linux strongly resemble each other in many ways but are different operating systems.

Question 16

IBM and Hewlett-Packard were among the companies that established The Open Group,which still owns the trademark to the name UNIX.

Question 17

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

Question 18

The portability of UNIX is attributed to the fact that most of it is written in the high-level language Java.

Question 19

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

Question 20

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

Question 21

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

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

Question 22

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 ____.

A) contains the size of the disk
B) holds free blocks available for file storage
C) includes a list of file definitions
D) is reserved for booting

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 for an execution slot
C) with the least amount of time remaining to execute
D) with the longest time spent on the secondary storage

Question 24

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

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

Question 25

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 26

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 27

When was the first version of UNIX written?

A) 1969
B) 1971
C) 1975
D) 1984

Question 28

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

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

Question 29

UNIX uses the ____ page replacement algorithm.

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

Question 30

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 event
D) synchronization problem

Question 31

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 32

____ 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 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

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 35

In UNIX,a ____ table is allocated to each active process that includes information such as the user and group identification numbers to determine file access privileges.

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

Question 36

UNIX uses a ____ to keep track of which processes are using shared program code.

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

Question 37

There is no return from a successful ____ call.

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

Question 38

To change to a directory that is up one level from the current working directory in the UNIX hierarchical directory tree structure,you can type ____.

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

Question 39

____ 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 40

A terminal has two input queues.As a user types each character to the terminal,it is collected in the ____ queue.

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

Question 41

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

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

Question 42

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

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

Question 43

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

A) section_a = chapt1 + chapt2
B) cp chapt1 section_a,cp chapt2 section_a
C) cat chapt1 chapt2 > section_a
D) ls chapt1,chapt2,section_a