CS131 Week 1 and Week 2
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Questions and Answers

Which programming language was UNIX initially written in?

  • BCPL
  • PDP-11/20
  • Assembly (correct)
  • C

    • What is one of the main advantages of UNIX?

  • It is not compatible with different types of computing hardware.
  • It allows many users to run many programs at the same time. (correct)
  • It supports only one user at a time.
  • It is not open source.

    • Which programming language was UNIX rewritten in and enhanced in 1973?

  • BCPL
  • PDP-11/20
  • C (correct)
  • Assembly

    • Which command in vi is used to delete a character?

    <p>x</p> Signup and view all the answers

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

    <p>yy</p> Signup and view all the answers

    Which command in vi is used to paste the most recent deleted or yanked text below the current line?

    <p>p</p> Signup and view all the answers

    What does the command 'wc -l searchfile.txt' do?

    <p>Prints the line count</p> Signup and view all the answers

    Which command is used to display the contents of a file in a pager format, allowing you to browse through the file?

    <p>less</p> Signup and view all the answers

    Which command is used to display the beginning (or top) portion of a file?

    <p>head</p> Signup and view all the answers

    Which command is used to display the last 10 lines of a file?

    <p>tail -10 filename</p> Signup and view all the answers

    Which command is used to edit a file with the vi editor?

    <p>vi</p> Signup and view all the answers

    According to the text, what is the role of the kernel in an operating system?

    <p>It is like the brain of the boss, talking directly to the hardware, controlling how programs use the computer's resources, and keeping everything organized and safe.</p> Signup and view all the answers

    According to the text, what is the shell in an operating system?

    <p>It provides an interface for running other applications.</p> Signup and view all the answers

    According to the text, what is the purpose of the system call interface in an operating system?

    <p>It is like the brain of the boss, talking directly to the hardware, controlling how programs use the computer's resources, and keeping everything organized and safe.</p> Signup and view all the answers

    According to the text, which statement about the UNIX kernel is true?

    <p>The UNIX kernel is a large C program that implements a general interface to a computer for writing programs.</p> Signup and view all the answers

    Which symbol is used to reference the contents of a variable in shell scripting?

    <p>$</p> Signup and view all the answers

    Which command is used to set the value of a variable in shell scripting?

    <p>echo</p> Signup and view all the answers

    What does an exit code of 0 mean in shell scripting?

    <p>The program terminated successfully</p> Signup and view all the answers

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

    <p>C</p> Signup and view all the answers

    What is the C Standard Library?

    <p>A set of functions used by C programs</p> Signup and view all the answers

    What is a shell?

    <p>A computer program that presents a command line interface</p> Signup and view all the answers

    What is the most commonly used shell in Linux?

    <p>Bash</p> Signup and view all the answers

    Which programming language was UNIX initially written in?

    <p>Assembly</p> Signup and view all the answers

    What is one of the main advantages of UNIX?

    <p>Multi-user and multi-tasking</p> Signup and view all the answers

    According to the text, what is the purpose of the system call interface in an operating system?

    <p>To provide a generic interface to different types of computing hardware</p> Signup and view all the answers

    Which command in vi is used to delete a line?

    <p>dd</p> Signup and view all the answers

    What is the purpose of the 'yy' command in vi?

    <p>Yank (copy) the current line</p> Signup and view all the answers

    Which command in vi is used to start a forward search?

    <p>/</p> Signup and view all the answers

    Which statement about the UNIX operating system is true?

    <p>The UNIX kernel is responsible for managing hardware dependent functions.</p> Signup and view all the answers

    What is the role of the shell in the UNIX operating system?

    <p>The shell provides an interface for running other applications.</p> Signup and view all the answers

    Which shell is considered better for interactive work?

    <p>tcsh (Turbo C-Shell)</p> Signup and view all the answers

    Which programming language was the UNIX operating system initially written in?

    <p>C</p> Signup and view all the answers

    What is the purpose of a shell program?

    <p>To interpret commands and carry out desired actions</p> Signup and view all the answers

    What is the purpose of the system call interface in the UNIX operating system?

    <p>The system call interface provides access to the UNIX system services.</p> Signup and view all the answers

    What is the most basic entity in a UNIX system?

    <p>Regular file</p> Signup and view all the answers

    What is the structure of a regular file in UNIX?

    <p>Named, variable length, sequence of bytes</p> Signup and view all the answers

    Which command is used to display the contents of a file in a pager format, allowing you to browse through the file?

    <p>less</p> Signup and view all the answers

    What does the command 'tail -f file' do?

    <p>Follow the file and display data as it is being written to the file</p> Signup and view all the answers

    Which command is used to edit a file with the vi editor?

    <p>vi</p> Signup and view all the answers

    What does the command 'ls -latr' do?

    <p>List all files in the current directory, including hidden files, sorted by modification time in reverse order</p> Signup and view all the answers

    Study Notes

    UNIX Fundamentals

    • UNIX was initially written in assembly language.
    • One of the main advantages of UNIX is its portability.

    UNIX Rewritten

    • UNIX was rewritten in C and enhanced in 1973.

    vi Editor Commands

    • The x command in vi is used to delete a character.
    • The yy command in vi is used to yank (copy) the current line.
    • The p command in vi is used to paste the most recent deleted or yanked text below the current line.
    • The dd command in vi is used to delete a line.

    File Management Commands

    • The wc -l searchfile.txt command counts the number of lines in a file.
    • The less command is used to display the contents of a file in a pager format, allowing you to browse through the file.
    • The head command is used to display the beginning (or top) portion of a file.
    • The tail command is used to display the last 10 lines of a file.
    • The vi command is used to edit a file with the vi editor.

    Operating System Components

    • The kernel in an operating system is responsible for managing hardware resources and providing services to applications.
    • The shell in an operating system is a user-level interface that provides a command-line interface to interact with the operating system.
    • The system call interface in an operating system is a layer of abstraction that provides a way for applications to interact with the kernel.

    Shell Scripting

    • The dollar sign ($) is used to reference the contents of a variable in shell scripting.
    • The set command is used to set the value of a variable in shell scripting.
    • An exit code of 0 in shell scripting means that the program executed successfully.

    Programming Languages

    • The C programming language is used to write the Unix operating system itself.
    • The C Standard Library is a collection of libraries that provide a set of functions for performing common tasks.

    Shells

    • A shell is a command-line interface that provides a way for users to interact with the operating system.
    • The most commonly used shell in Linux is Bash.
    • Bash is considered better for interactive work.

    UNIX Operating System

    • The purpose of the system call interface in the UNIX operating system is to provide a way for applications to interact with the kernel.
    • The purpose of a shell program in the UNIX operating system is to provide a user-level interface to interact with the operating system.
    • The most basic entity in a UNIX system is a process.
    • A regular file in UNIX has a structure consisting of a header, data, and attributes.

    Command Usage

    • The tail -f file command is used to display the last few lines of a file and continue to update the display as new lines are added to the file.
    • The ls -latr command is used to list the contents of a directory in a long format, with the most recent files last.

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    Test your knowledge of command line basics with this quiz! From navigating directories to listing files and using wildcards, this quiz covers essential commands that will "grow" on you. Challenge yourself and see how well you fare!

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