Operating System [3i Infotech Placement]: Sample Questions 10 - 11 of 81

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Question 10

Operating System



The UNIX shell ________


Choice (4)


Does not give any scope for programming


Does not come with the rest of the system


Forms the interface between the user and the kernel


Does not allow calling one program from within another




  • A Shell provides an interface to the Unix system.
  • It gathers inputs and executes programs based on that input forming an interface between the user and the kernel.
  • When a program finishes executing, it displays program՚s output.
  • Shell provides and environment to run user commands, programs, and shell scripts.
  • There are different flavours of a shell each with its own set of recognized commands and functions.
Different Flavours of a Shell

Question 11

Operating System

Describe in Detail


What is a shell?


Understanding the Structure of Shell
  • Shell is a UNIX term in the operating system- a layer of programming that understands and executes the commands a user enters.
  • The shell is called a command interpreter.
  • A shell usually implies an interface with command syntax.
  • The shell gets started on login and provides quick way to execute utilities
  • A shell is not part of system kernel, but uses system kernel to execute programs and create files.
  • Following are various ways to get shell access:
    • Terminal
    • Connect via secure shell
    • Use the console

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