File Permissions, Users, and Security

Which one of the following statements concerning Linux passwords is true?

• All passwords can be decrypted using the system administrator's master password.

• Passwords may never start with a non-letter.

• Users cannot change their password once it has been set.

• Passwords are only stored in encrypted form.

• Passwords may be at most six characters long.

Which of the following commands can be used to determine the time of the last login of a given user?

• showlog

• recent

• last

• history

• login

Which of the following files holds the definition of the local user accounts?

• /etc/secret

• /etc/users

• /etc/passwd

• /etc/id

• /etc/home

What permissions are set on a file with the command chmod 654 file.txt?

• drw-r-xr--

• d--wxr-x--

• --wxr-x--x

• -rwxrw---x

• -rw-r-xr—

Given the following directory permissions:

drwxrwxrwt 14 root root 36864 2012-03-02 11:17 /tmp

What does the letter t at the end of drwxrwxrwt indicate?

• It is the sticky bit that causes all commands in this directory to be launched as root.

• It means that even though the directory is globally writable only the owner can delete their own files.

• It makes the directory accessible for everybody.

• It indicates that this directory contains only temporary files that may be deleted.

• It is a temporary bit that prevents launching commands in this directory.

When a new user is added, where does the user ID get stored?

• /etc/users

• /etc/realm

• /etc/pass

• /etc/shpasswd

• /etc/passwd

Which statement about users and user groups is correct?

• A group can only have one main user.

• There can be only one user group on a system.

• Users do not have to belong to a user group.

• Every user belongs to a least one user group.

What are the three sets of permissions for a file?

• user, group, others

• administrator, group, others

• user, standard user, others

• administrator, standard user, others

Which command displays the list of groups to which a user belongs?

• whoami

• lsgroup

• who

• id

Which of the following will change the group that is associated with a file?

• chmod

• chmod -w

• chown

• ls -g