Configuring Permissions Linux 3

What is the octal representation for the permission 'rw- r-- ---'?

• 640

• 550

• 770

• 440

Answer explanation

The octal representation for the permission 'rw- r-- ---' is 640. In this permission set, the owner has read and write (rw-) permissions, which is 6 in octal. The group has read (r--) permission, which is 4 in octal. Others have no permissions (---), which is 0 in octal. So, the octal representation is 640.

What command is used to set the default permissions on newly created files and directories?

• umask

• tmask

• usermask

• rmask

Answer explanation

The correct answer is 'umask'. The 'umask' command is used to set the default permissions on newly created files and directories in Unix-based systems. It helps in controlling the access permissions for files and directories, ensuring that only authorized users can access them. The other options, 'tmask', 'usermask', and 'rmask', are not valid commands for setting default permissions.

What command is used to modify permissions on file / directories?

• chmod

• umod

• changemod

• gmod

Answer explanation

The correct command to modify permissions on files and directories is 'chmod'. The other options, 'umod', 'changemod', and 'gmod', are not valid commands for this purpose. 'chmod' stands for 'change mode' and is used to set or modify the access permissions of files and directories in Unix and Unix-like operating systems.

What command is used to change ownership for a file or directory?

• chown

• chngown

• changeown

• own

Answer explanation

The correct command to change ownership for a file or directory in Unix-like operating systems is 'chown'. The other options 'chngown', 'changeown', and 'own' are not valid commands. 'chown' stands for 'change owner' and is used to change the owner and group of files, directories and links.

What command is used to change group ownership of a file or directory?

• chgrp

• changegrp

• groupch

• groupchange

Answer explanation

The correct command to change group ownership of a file or directory is 'chgrp'. This command allows you to modify the group associated with a file or directory, making it easier to manage permissions and access control. The other options, 'changegrp', 'groupch', and 'groupchange', are not valid commands for this purpose.

What command is used to list attributes of files or directory?

• lsattr

• attrls

• listattr

• list

Answer explanation

The correct answer to the question 'What command is used to list attributes of files or directory?' is 'lsattr'. This command is used in Unix and Linux based systems to list the attributes of files and directories. The other options 'attrls', 'listattr', and 'list' are not valid commands for this purpose.

What command is used to change the attributes of files or directories?

• chattr

• attrlch

• chngattr

• attribute

What is the permission that allows a user to have similar permissions as the file's user or owner?

• suid

• idsu

• sudoid

• idsuper

Answer explanation

The correct answer is 'suid'. 'suid' stands for 'Set User ID'. It is a special type of permission that allows a user to execute a file with the permissions of the file's owner. This means the user will have similar permissions as the file's owner. The other options 'idsu', 'sudoid', and 'idsuper' do not represent this concept.

What is the permission that allows a user to have similar permissions as the file's group owner?

• sgid

• idsg

• gpid

• idgp

Answer explanation

The correct answer is 'sgid'. SGID (Set Group ID) is a permission that allows a user to have similar permissions as the file's group owner. It is used to ensure that users can access and modify files and directories belonging to the group, without granting them full ownership permissions.

What is the special permission bit called that protects files in a directory?

• sticky bit

• bit sticky

• sticky

• bit

Answer explanation

The special permission bit that protects files in a directory is called the 'sticky bit'. It ensures that only the file owner, directory owner, or root user can delete or rename the files within the directory, providing additional security and control over the files.