Classical

Unix - Filters and Commands

1:  

Which of the following features of UNIX may be used for inter process communication?

A. Signals
B. Pipes
C. Semaphore
D. All of these
 
 

Option: D

Explanation :


2:  

 In a system, if 5 people are currently using the vi editor. then the number of corresponding processes will be

A. 1
B. 5
C. 2
D. 0
 
 

Option: B

Explanation :


3:  

 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)
 
 

Option: D

Explanation :
/dev/tty is a synonym for the terminal you are currently using.
If echo welcome >/dev/tty, is a part of a shell. welcome will be echoed in the terminal in which the script is run, doesn't matter which terminal it is.


4:  

 dev/null

A. Is a file
B. Has write permission for all
C. Is the UNIX built-in dustbin
D. All of these
 
 

Option: D

Explanation :
/dev/null can be called UNIX built-in dust-bin. To prevent a program from filling the monitor with garbage.
/dev/null comes in handy. Just redirect it to /dev/nul1. It
gladly accepts garbage. It is a universal sink.


5:  

The advantage of binary files over text files is that

A. It is compact
B. It can be accessed faster
C. They are more reliable
D. All of these
 
 

Option: D

Explanation :




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Syllabus covered in this section is-

  • The UNIX System: File system, process management.
  •  Bourne shell, shell variables, command line programming
  •  Filters and Commands: Pr. Head, tail, cut. Paste. Sort. uniq, tr, join, etc, grep, egrep, fgrep, etc, sed, awk, etc.
  • System Calls (like) : Create, open. Close, read, write, iseek, link, unlink, stat, fstat, umask, chmod, exec, fork, wait, system.
  • Unix :Operating System
  •  Structure of Unix Operating System
  • UNIX Commands. Interfacing with Unix
  •  Editors and Compilers for Unix LEX  and YACC
  •  File system, System calls.
  • Filters, Shell programming

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  • Post Graduate Computer Science Test
  •  PhD Entrance Exam
  • Computer Engineering
  • National Eligibility Test (NET)
  • State Eligibility Test (SET)

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