CS131 Week 4

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Questions and Answers

Which symbol is used to represent the root directory in the UNIX file system?

/ (correct)

What is the purpose of the dot symbol in the UNIX file system?

Refers to the previous directory

Refers to the current directory (correct)

Refers to the parent directory

Refers to the root directory

What is the purpose of the dot-dot symbol in the UNIX file system?

Refers to the current directory

Refers to the root directory

Refers to the parent directory (correct)

Refers to the previous directory

Which command is used to search for files and directories across the entire filesystem or within a specified directory, including subdirectories?

find Signup and view all the answers

Which option is used with the find command to search for files with names ending in '.conf'?

-name '*.conf' Signup and view all the answers

Which command is used to read items from standard input and execute a specified command with those items as arguments?

xargs Signup and view all the answers

Which character represents the root directory in UNIX-like operating systems?

/ Signup and view all the answers

Which of the following is the most common file type on a filesystem?

a) Ordinary (data) file Signup and view all the answers

What does the character device file /dev/tty represent?

a) Terminal device Signup and view all the answers

Which types of files can be read from and written to using the character device file /dev/tty?

c) Both terminal and disk devices Signup and view all the answers

Which command is used to create a new directory in Linux?

mkdir Signup and view all the answers

What does the 'ls -l' command do in Linux?

Lists all files and directories with detailed information Signup and view all the answers

What permissions will 'chmod 755' set?

rwx for owner, rx for group and others Signup and view all the answers

What permissions are required to cd to a directory and access files in it?

Execute (x) permission Signup and view all the answers

Which of the following is true about a directory in UNIX?

A directory is a file that contains information about the files and subdirectories it contains Signup and view all the answers

Which of the following is true about an inode in UNIX?

An inode contains all the information about a file Signup and view all the answers

What does the 'mv' command do in UNIX?

Rename a file to a different name Signup and view all the answers

What happens when you call 'rmdir' on a non-empty directory in UNIX?

The command fails Signup and view all the answers

Study Notes

The root directory in the UNIX file system is represented by the slash (/) symbol.

The dot (.) symbol represents the current working directory in the UNIX file system.
The dot-dot (..) symbol represents the parent directory in the UNIX file system.
The find command is used to search for files and directories across the entire filesystem or within a specified directory, including subdirectories.
The find command with the -name option is used to search for files with names ending in a specific pattern, such as .conf.
The xargs command is used to read items from standard input and execute a specified command with those items as arguments.

File System Structure

The character / represents the root directory in UNIX-like operating systems.
Regular files are the most common file type on a filesystem.
The character device file /dev/tty represents the controlling terminal of a process.

File Operations

The mkdir command is used to create a new directory in Linux.
The ls -l command displays detailed information about files and directories in a long format.
The chmod 755 command sets permissions to allow the owner to read, write, and execute, and others to read and execute.
Execute permission is required to cd to a directory and access files in it.

Directories and Inodes

A directory in UNIX is a special type of file that contains a list of filenames and inode numbers.
An inode in UNIX is a data structure that contains information about a file, such as its ownership, permissions, and location on disk.

File Management

The mv command is used to rename or move files in UNIX.
When you call rmdir on a non-empty directory in UNIX, it returns an error message and does not delete the directory.

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Description

Test your knowledge on the find command and its purpose in searching files and directories. Learn about the various criteria it can be used with, including name, type, size, modification time, and permissions.