CS131 - Week 1 and 2 (Hard)

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Questions and Answers

Which programming language was UNIX initially written in?

BCPL

Assembly (correct)

PDP-11/20

What is one of the key features of UNIX?

Portability

Stability and Reliability

Large Software Ecosystem

Powerful Command-Line Interface (CLI) (correct)

What is one of the benefits of using UNIX?

Multi-user and multi-tasking

Open source

Geared for high programmer productivity

All of the above (correct)

Which programming language is used to write the Unix operating system itself?

C Signup and view all the answers

What is the role of a shell in a computer system?

To interpret and execute commands Signup and view all the answers

What is a regular file in a UNIX system?

A file that contains a sequence of bytes Signup and view all the answers

Which shell is considered the default shell in most Linux versions?

bash Signup and view all the answers

Which command is used to list files in a directory?

ls Signup and view all the answers

Which wildcard character matches exactly one character?

? Signup and view all the answers

What does the command 'head -n 10 filename' do?

Print the first 10 lines of filename Signup and view all the answers

What does the command 'tail -100 filename' do?

Print the last 100 lines of filename Signup and view all the answers

Which of the following is NOT true about UNIX?

UNIX is the only operating system used for software development Signup and view all the answers

What is the purpose of the shell in UNIX?

To provide an interface for running other applications Signup and view all the answers

What is the role of the kernel in UNIX?

To manage all the hardware dependent functions Signup and view all the answers

What is the purpose of Git and Github in this course?

To submit assignments and worksheets Signup and view all the answers

Which command in vi is used to delete a line?

dd Signup and view all the answers

Which command in vi is used to copy the current line?

yy Signup and view all the answers

In vi, what command is used to start a forward search?

/ Signup and view all the answers

Study Notes

UNIX Basics

UNIX was initially written in the C programming language.
One of the key features of UNIX is its portability across different platforms.

UNIX Benefits

One of the benefits of using UNIX is its multi-user capability, allowing multiple users to access the system simultaneously.

UNIX Operating System

The C programming language is used to write the UNIX operating system itself.

Shell in UNIX

The shell plays a crucial role in a computer system, acting as an interface between the user and the operating system.
The shell interprets commands and executes them accordingly.

File System in UNIX

A regular file in a UNIX system is a file that contains data or program instructions.

Default Shell in Linux

Bash (Bourne-Again SHell) is considered the default shell in most Linux versions.

File Management Commands

The ls command is used to list files in a directory.
The ? wildcard character matches exactly one character.
The head -n 10 filename command displays the first 10 lines of a file.
The tail -100 filename command displays the last 100 lines of a file.

UNIX Characteristics

It is not true that UNIX is a single-user operating system.

Shell and Kernel Roles

The shell's purpose in UNIX is to provide a command-line interface for users to interact with the operating system.
The kernel's role in UNIX is to manage the system's hardware resources and provide services to the shell.

Version Control Systems

The purpose of Git and Github in this course is to manage and track changes in code repositories.

vi Editor Commands

The dd command in vi is used to delete a line.
The yy command in vi is used to copy the current line.
The / command in vi is used to start a forward search.

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Description

Test your knowledge of C programming and Unix operating system with this quiz! Learn about the significance of "C" and "libc", as well as the basics of a shell and how it allows you to control your computer through command line interface.