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Questions and Answers
What is stored with the inode, not the name?
What is stored with the inode, not the name?
What command can be used to see the inode numbers paired with each name?
What command can be used to see the inode numbers paired with each name?
What is the purpose of the link count in a hard link?
What is the purpose of the link count in a hard link?
What is a soft link also known as?
What is a soft link also known as?
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What is the link count of an empty directory?
What is the link count of an empty directory?
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What can the super-user account root do on a Unix system?
What can the super-user account root do on a Unix system?
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Why are soft links considered second-class citizens?
Why are soft links considered second-class citizens?
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What happens when you try to access a dangling symlink?
What happens when you try to access a dangling symlink?
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What is the purpose of the -inum expression operator in the find command?
What is the purpose of the -inum expression operator in the find command?
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What is the difference between a hard link and a symbolic link?
What is the difference between a hard link and a symbolic link?
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What is the primary function of the /etc/passwd file?
What is the primary function of the /etc/passwd file?
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What is the purpose of the usermod command?
What is the purpose of the usermod command?
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How many owners can a file system inode have?
How many owners can a file system inode have?
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What determines the permissions of a process?
What determines the permissions of a process?
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What is the purpose of the groups command?
What is the purpose of the groups command?
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What type of permission is required to execute a file?
What type of permission is required to execute a file?
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What happens when you change the permissions of a symbolic link?
What happens when you change the permissions of a symbolic link?
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What is the purpose of the chmod command?
What is the purpose of the chmod command?
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What type of link is a directory entry that points to an inode?
What type of link is a directory entry that points to an inode?
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What is the relationship between a directory and its inode?
What is the relationship between a directory and its inode?
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What is the term 'file' often referred to in Unix/Linux?
What is the term 'file' often referred to in Unix/Linux?
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What can be read as if it were a regular file, with sufficient permissions?
What can be read as if it were a regular file, with sufficient permissions?
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What do directories map?
What do directories map?
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What is a characteristic of inodes?
What is a characteristic of inodes?
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What is stored in inodes?
What is stored in inodes?
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What is the relationship between a directory and its inode?
What is the relationship between a directory and its inode?
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What is the purpose of the ROOT directory inode?
What is the purpose of the ROOT directory inode?
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What is the result of having multiple names for one inode?
What is the result of having multiple names for one inode?
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What is the relationship between an inode and a file system object?
What is the relationship between an inode and a file system object?
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What do the file system diagrams show?
What do the file system diagrams show?
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Which operation is not a directory operation?
Which operation is not a directory operation?
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What is the purpose of a link count in a hard link?
What is the purpose of a link count in a hard link?
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What happens when you try to access a symbolic link that points to a non-existent file?
What happens when you try to access a symbolic link that points to a non-existent file?
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What is the relationship between a directory and its inode?
What is the relationship between a directory and its inode?
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What is the primary advantage of having multiple names for one inode?
What is the primary advantage of having multiple names for one inode?
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What is the term for a directory entry that points to an inode?
What is the term for a directory entry that points to an inode?
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What is the primary function of the /etc/group file?
What is the primary function of the /etc/group file?
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What is the purpose of the usermod and groupmod commands?
What is the purpose of the usermod and groupmod commands?
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What is the relationship between a directory and its inode?
What is the relationship between a directory and its inode?
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What is the purpose of the id command?
What is the purpose of the id command?
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How many group IDs can a process have?
How many group IDs can a process have?
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What is the purpose of the whoami command?
What is the purpose of the whoami command?
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What is stored in the inode?
What is stored in the inode?
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What is the result of having multiple names for one inode?
What is the result of having multiple names for one inode?
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What is a directory in Unix/Linux?
What is a directory in Unix/Linux?
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What is the purpose of inodes in a file system?
What is the purpose of inodes in a file system?
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What is the result of having multiple names for one inode?
What is the result of having multiple names for one inode?
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What is stored in an inode?
What is stored in an inode?
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What is the root directory inode?
What is the root directory inode?
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What do file system diagrams show?
What do file system diagrams show?
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Study Notes
Directories and Inodes
- Every directory except the ROOT directory has a name, which is stored in a directory inode above it.
- Directories hold only names and inode numbers, not attributes.
- Attributes are stored with the inode, not the name.
Inodes
- An inode stores attribute information of a file system object.
- To find out attribute information, you must use the inode number to find the inode and look at the item's attributes.
- Inodes contain pointers to disk blocks.
- Inodes contain attributes (owners, permissions, times, etc.).
- Inodes are unique inside a file system.
- Inodes are a fixed resource.
Hard Links
- Multiple names can point to the same inode (hard links).
- The link count counts the number of names pointing to an inode.
- Creating a hard link (ln) increases the link count, while removing a name (rm) decreases the link count.
- An empty directory has a link count of two.
Soft Links (Symbolic Links)
- Soft links are created using the ln command with the -s option.
- Soft links can be dangling, meaning the target does not exist.
- Soft links are second-class citizens.
- Relative and absolute targets can be used for soft links.
File Systems and Permissions
- Unix/Linux is a multi-user system, with the super-user account (root) having access to everything.
- File systems contain names of directories and files.
- Files are a list of bytes.
- Even hardware devices have file names.
- Inodes contain information on file system objects.
- Permissions are used to control access to file system objects.
Users, Groups, and Processes
- The password file (/etc/passwd) maps a user ID number to a name.
- The group file (/etc/group) maps each group ID number to a name.
- User IDs and group IDs are used to calculate permissions.
- Processes run with a user ID and multiple group IDs.
Permissions and Inodes
- Inodes have one owner (user ID) and one group.
- Permissions are used to match the login user ID and groups to inode owner and group.
- Symbolic mode and numeric mode can be used to set permissions.
- Permissions can be set for the owner, group, and others.
- Execute/Search permissions are used for directories.
Directories and Inodes
- Every directory except the ROOT directory has a name, which is stored in a directory inode above it.
- Directories hold only names and inode numbers, not attributes.
- Attributes are stored with the inode, not the name.
Inodes
- An inode stores attribute information of a file system object.
- To find out attribute information, you must use the inode number to find the inode and look at the item's attributes.
- Inodes contain pointers to disk blocks.
- Inodes contain attributes (owners, permissions, times, etc.).
- Inodes are unique inside a file system.
- Inodes are a fixed resource.
Hard Links
- Multiple names can point to the same inode (hard links).
- The link count counts the number of names pointing to an inode.
- Creating a hard link (ln) increases the link count, while removing a name (rm) decreases the link count.
- An empty directory has a link count of two.
Soft Links (Symbolic Links)
- Soft links are created using the ln command with the -s option.
- Soft links can be dangling, meaning the target does not exist.
- Soft links are second-class citizens.
- Relative and absolute targets can be used for soft links.
File Systems and Permissions
- Unix/Linux is a multi-user system, with the super-user account (root) having access to everything.
- File systems contain names of directories and files.
- Files are a list of bytes.
- Even hardware devices have file names.
- Inodes contain information on file system objects.
- Permissions are used to control access to file system objects.
Users, Groups, and Processes
- The password file (/etc/passwd) maps a user ID number to a name.
- The group file (/etc/group) maps each group ID number to a name.
- User IDs and group IDs are used to calculate permissions.
- Processes run with a user ID and multiple group IDs.
Permissions and Inodes
- Inodes have one owner (user ID) and one group.
- Permissions are used to match the login user ID and groups to inode owner and group.
- Symbolic mode and numeric mode can be used to set permissions.
- Permissions can be set for the owner, group, and others.
- Execute/Search permissions are used for directories.
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Description
This quiz explores the concepts of directories and inodes in file system management, including their structure and attributes. Learn how directories and inodes are organized and how they store information about file system objects.