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Questions and Answers
What is the Linux shell?
What is the Linux shell?
It is the Command Line Interface (CLI) or Text User Interface (TUI) that administrators use to control a Linux operating system.
What does TUI stand for?
What does TUI stand for?
Text User Interface
What is the Bourne-again shell (bash)?
What is the Bourne-again shell (bash)?
The standard shell used in most Linux computers, similar to a UNIX shell.
What is 'sh'?
What is 'sh'?
What does 'ksh' stand for?
What does 'ksh' stand for?
What does 'csh' represent?
What does 'csh' represent?
What is 'tcsh'?
What is 'tcsh'?
A list of shells is stored in the ______
A list of shells is stored in the ______
What is the Kernel?
What is the Kernel?
What does the tilde symbol (~) indicate in a prompt?
What does the tilde symbol (~) indicate in a prompt?
What is a command path?
What is a command path?
How do you see the command path?
How do you see the command path?
How do you add a directory to a path?
How do you add a directory to a path?
How do you execute programs in Linux?
How do you execute programs in Linux?
What command do you type to run an executable in the present working directory?
What command do you type to run an executable in the present working directory?
What does the '/' symbol indicate?
What does the '/' symbol indicate?
What is a pathname?
What is a pathname?
File names and paths in Linux are case sensitive.
File names and paths in Linux are case sensitive.
What key do you press to complete a file, command, or directory name?
What key do you press to complete a file, command, or directory name?
What command shows the present working directory?
What command shows the present working directory?
What command displays the current username?
What command displays the current username?
What is the purpose of the 'uname' command?
What is the purpose of the 'uname' command?
What does the '-a' option of 'uname' do?
What does the '-a' option of 'uname' do?
What does the '-o' option of 'uname' print?
What does the '-o' option of 'uname' print?
What does the '-p' option of 'uname' do?
What does the '-p' option of 'uname' do?
What does the 'su' command do?
What does the 'su' command do?
What does 'su -l user_name' do?
What does 'su -l user_name' do?
What does 'su user_name' do?
What does 'su user_name' do?
What is the difference between 'su - user_name' and 'su user_name'?
What is the difference between 'su - user_name' and 'su user_name'?
The '#' symbol indicates the current user is a normal user.
The '#' symbol indicates the current user is a normal user.
The '$' symbol indicates the current user is a normal user.
The '$' symbol indicates the current user is a normal user.
What is the purpose of the 'exit' command?
What is the purpose of the 'exit' command?
What does 'exec' do?
What does 'exec' do?
What does 'cd' command do?
What does 'cd' command do?
What does 'cd bin' do?
What does 'cd bin' do?
What does 'cd /usr/bin' do?
What does 'cd /usr/bin' do?
What command shows names of files and directories in the current directory?
What command shows names of files and directories in the current directory?
What does 'ls -a' command do?
What does 'ls -a' command do?
What does 'ls -l' command show?
What does 'ls -l' command show?
Study Notes
Linux Shell Overview
- The Linux shell serves as the Command Line Interface (CLI) or Text User Interface (TUI) for interacting with the Linux operating system.
- Users and programs send commands to the system through the shell.
Types of Shells
- Bash (Bourne-again shell): The default shell in most Linux systems; features include command completion, command history, and improved arithmetic functions.
- sh (Bourne shell): The original shell created by Steve Bourne; predecessors to Bash.
- ksh (Korn shell): Developed by David Korn; includes unique features not found in Bash and is an evolution of the Bourne shell.
- csh (C shell): Utilizes syntax similar to C programming language.
- tcsh: An enhanced version of csh, featuring command line editing and completion.
Shell Configuration
- /etc/shells file: Contains a list of shells recognized by the system.
- The kernel interacts with all shells and isolates their functionality from the core system.
Navigating the Shell
- The tilde symbol (~) in the prompt denotes that the current working directory is the user's home directory.
- The command path defines directories where executable files for commands are located.
- Enter
echo $PATHto display the current command path.
Executing Programs
- To run an executable in the current directory, type
./filename. - The pathname allows execution of files from any location in the filesystem.
File Handling
- File names and paths in Linux are case-sensitive.
- The Tab key can be used for auto-completing file, command, or directory names.
Useful Shell Commands
pwd: Displays the present working directory.whoami: Shows the username of the current user.uname: Prints system information; options include-afor all info,-ofor operating system, and-pfor processor architecture.
User Management
su: Switches users without loading new environmental variables; requires the user's password.su -l usernameandsu - username: Switch to a specified user with or without loading user-specific environment settings.- Root user: Identified by the
#prompt; normal users are indicated by the$prompt. exit: Exits the current shell or logs out from a user session.
Directory Management
cd: Changes directories; can change to subdirectories or absolute paths (e.g.,cd /usr/bin).ls: Lists files and directories; variations includels -afor all files andls -lfor detailed information about files.
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Description
Test your knowledge of Linux shell terminology with these flashcards. This quiz covers key concepts like the Command Line Interface, Text User Interface, and the Bourne-again shell (bash). Enhance your understanding of Linux environments and their command structures.
