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Free download in PDF Unix Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The command who sort - file1 > file2
[A]
Results in an error
[B]
Sorts the contents of file1 and puts it in file2
[C]
Both (a) and (b)
[D]
None of the above
Answer: None of the above
(2)
Choose the correct statements.
[A]
| can be used to direct output to programs
[B]
> can be used to direct output to a named file
[C]
The symbols > and | are both processed by shell
[D]
All of above
(3)
Which of the following are not filter programs?
[A]
date
[B]
sort
[C]
catr
[D]
grep
(4)
The main reasons for the success of pipes are
[A]
The availability of many filter programs
[B]
UNIX treats devices as files
[C]
It provides a 2-way communication channel
[D]
Both (a) and (b)
(5)
Which of the following file names can be found in more than one directoy?
[A]
passwd
[B]
bin
[C]
date
[D]
Both (a) and (b)
(6)
If cat x. prints garbage. then x is probably a
[A]
Binary file
[B]
Text file
[C]
Data file
[D]
Source file
(7)
The file that stores an integer as a sequence of characters is a
[A]
Text file
[B]
Data file
[C]
Binary file
[D]
Core file
(8)
The differences between malloc( ) and calloc() are:
[A]
Malloc is used for dynamic allocation of memory, while cal:1�c can't be used for that purpose
[B]
Malloc needs only one argument. while cal loc needs two.
[C]
unlike malloc, calloc allocates memory and initializes it to 0.
[D]
Both (b) and (c)
(9)
Which of the following remarks about realloc are true?
[A]
It allocates memory of required size that need not be contiguous
[B]
It may shift the existing block
[C]
It can work only with an existing block of memory
[D]
Both (b) and (c)
(10)
To allow only one user to work with a particular file at a particular time, one has to use
[A]
Semaphore
[B]
Critical region
[C]
Locking
[D]
Dedicated mode
(11)
Files that store data in the same format as used in program are called
[A]
Source file
[B]
Core
[C]
Text file
[D]
binary files
(12)
Choose the incorrect statements.
[A]
Shell scripts are compiled
[B]
Shell is a programming language
[C]
Shell scripts are interpreted
[D]
Shell scripts can accept arguments
Answer: Shell scripts are compiled
(13)
Shell script is preferable to other forms of programming because it
[A]
Occupies less space
[B]
Enhances portability
[C]
Makes programming task easier
[D]
All of these
(14)
Let x.c be a C source code. The command cc x.c > y
[A]
is equivalent to the command cc x.c;mv a.out y
[B]
is equivalent to the command cc -o y x.c
[C]
serves no purpose
[D]
None of the above
Answer: serves no purpose
(15)
Which of the following string functions can be used to find the last occurrence of a given character in a given string?
[A]
strchr
[B]
strncpy
[C]
strncmp
[D]
None of the above
(16)
Writing a C program that accepts input from keyboard, rather than from a file is advantageous because
[A]
Keyboard is a file that is already open
[B]
It can be used in a pipe, if it writes to stdout
[C]
Both (a) and (b)
[D]
None of the above
(17)
If one doesn't want anyone else to read or write to a file named datfile, except through a program in a file filex , then he may use
[A]
chmod u+s filex ; chmod go_rw datfile
[B]
chmod 4711 filex ; chmod go_rw datfile
[C]
chmod 4711 datfile ; chmod go_rw filex
[D]
Both (a) and (b)
(18)
The advantage of binary files over text files is that
[A]
It can be accessed faster
[B]
It is compact
[C]
They are more reliable
[D]
All of these
(19)
The command echo welcome > /dev / tty
[A]
Echoes welcome in all the terminals that are switched on.
[B]
Echoes welcome in all the terminals that are logged on.
[C]
Echoes welcome only in the terminal in which it is run.
[D]
Both (a) and (c)
(20)
Which of the following features of UNIX may be used for inter process communication?
[A]
Semaphore
[B]
Signals
[C]
Pipes
[D]
All of these
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