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What information is stored in/etc/passwd? (Choose three correct answers.)
A. The encrypted password
B. The username
C. The numerical user ID
D. The users default shell
E. The user's storage space limit
Answer: B,C,D
Explanation:
Explanation
The /etc/passwd file is a plain text-based database that contains information for all user accounts on the system. It is owned by root and has 644 permissions. The file can only be modified by root or users with sudo privileges and readable by all system users. Each line of the /etc/passwd file contains seven comma-separated fields, representing a user account. The fields are as follows:
* Username: The string you type when you log into the system. Each username must be a unique string on the machine. The maximum length of the username is restricted to 32 characters.
* Password: In older Linux systems, the user's encrypted password was stored in the /etc/passwd file. On most modern systems, this field is set to x, and the user password is stored in the /etc/shadow file.
* User ID (UID): The user identifier is a number assigned to each user by the operating system to refer to a user. It is used by the kernel to check for the user privileges and grant access to system resources. The UID 0 is reserved for the root user and cannot be assigned to any other user.
* Group ID (GID): The user's group identifier number, referring to the user's primary group. When a user creates a file, the file's group is set to this group. Typically, the name of the group is the same as the name of the user. User's secondary groups are listed in the /etc/group file.
* User ID Info (GECOS): This is a comment field. This field contains a list of comma-separated values with the following information: User's full name or the application name, Room number, Work phone number, Home phone number, Other contact information.
* Home directory: The absolute path to the user's home directory. It contains the user's files and configurations. By default, the user home directories are named after the name of the user and created under the /home directory.
* Login shell: The absolute path to the user's login shell. This is the shell that is started when the user logs into the system. On most Linux distributions, the default login shell is Bash.
Therefore, the correct answers are B, C, and E. The user's storage space limit (A) is not stored in the
/etc/passwd file, but in the /etc/quota file. The encrypted password (D) is not stored in the /etc/passwd file, but in the /etc/shadow file. References:
* Linux Essentials Topic 104: The Linux Operating System, section 104.4: Runlevels and Boot Targets.
* Linux Essentials Topic 106: Security and File Permissions, section 106.1: Basic security and identifying user types.
* Linux Essentials Topic 106: Security and File Permissions, section 106.2: Creating users and groups.
* Understanding the /etc/passwd File | Linuxize
* Understanding the /etc/passwd File - GeeksforGeeks
* passwd(5) - Linux manual page - man7.org
* Understanding /etc/passwd file in Linux - DEV Community
NEW QUESTION # 16
Which of the following examples shows the general structure of a for loop in a shell script?
A. for *.txt as file => echo $file
B. for ls *.txt exec {} ;
C. foreach @{file} { echo $i
}
D. for file in *.txt do
echo $i done
E. for *.txt ( echo $i )
Answer: D
NEW QUESTION # 17
Which of the following DNS record types hold an IP address? (Choose two.)
A. A
B. CNAME
C. AAAA
D. NS
E. MX
Answer: A,C
Explanation:
Explanation
The DNS record types that hold an IP address are the A and AAAA records. These records are used to map a domain name to an IP address of the host, which is necessary for establishing a connection between a client and a server. The A record holds a 32-bit IPv4 address, while the AAAA record holds a 128-bit IPv6 address.
For example, the A record for www.example.com could be: www.example.com. IN A 192.0.2.1
This means that the domain name www.example.com resolves to the IPv4 address 192.0.2.1. Similarly, the AAAA record for www.example.com could be: www.example.com. IN AAAA 2001:db8::1
This means that the domain name www.example.com resolves to the IPv6 address 2001:db8::1.
The other options are incorrect because:
* NS records are used to specify the authoritative name servers for a domain. They do not hold an IP address, but a domain name of the name server. For example, the NS record for example.com could be:
example.com. IN NS ns1.example.com.
This means that the name server ns1.example.com is authoritative for the domain example.com.
* MX records are used to specify the mail exchange servers for a domain. They do not hold an IP address, but a domain name of the mail server and a preference value. For example, the MX record for example.com could be:
example.com. IN MX 10 mail.example.com.
This means that the mail server mail.example.com has a preference value of 10 for receiving email for the domain example.com.
* CNAME records are used to create an alias for a domain name. They do not hold an IP address, but another domain name that the alias points to. For example, the CNAME record for www.example.com could be: www.example.com. IN CNAME example.com.
This means that the domain name www.example.com is an alias for the domain name example.com.
References:
* DNS Record Types: Defined and Explained - Site24x7
* List of DNS record types - Wikipedia
NEW QUESTION # 18
Which permissions are set on a regular file once the permissions have been modified with the command chmod 654 file.txt?
drw-r-xr--
A. d-wxr-x--
B. -rw-r-xr--
C.
D. -rwxrw---x
E. -wxr-x--x
Answer: B
NEW QUESTION # 19
What is true about the owner of a file?
A. Each file is owned by exactly one user and one group.
B. The user owning a file must be a member of the file's group.
C. The owner of a file cannot be changed once it is assigned to an owner.
D. The owner of a file always has full permissions when accessing the file.
E. When a user is deleted, all files owned by the user disappear.
Answer: A
Explanation:
In Linux, every file and directory is associated with an owner and a group. The owner is the user who created the file or directory, and the group is the group to which the owner belongs. Therefore, each file is owned by exactly one user and one group. This is true for option A. The other options are false for the following reasons:
Option B: The owner of a file does not always have full permissions when accessing the file. The permissions are determined by the file mode, which can be changed by the owner or the root user. The file mode specifies the read, write, and execute permissions for the owner, the group, and others. The owner can have different permissions than the group or others.
Option C: The user owning a file does not have to be a member of the file's group. The owner can change the group ownership of the file to any group on the system, regardless of whether the owner belongs to that group or not. However, only the root user or a user with the CAP_CHOWN capability can change the group ownership to a group that the owner is not a member of.
Option D: When a user is deleted, all files owned by the user do not disappear. The files remain on the system, but their owner is changed to an invalid user ID (UID). The files can still be accessed by the group or others, depending on the permissions. The files can also be reclaimed by the root user or a user with the CAP_CHOWN capability, who can change the owner to a valid user.
Option E: The owner of a file can be changed once it is assigned to an owner. The owner can transfer the ownership to another user, or the root user or a user with the CAP_CHOWN capability can change the owner to any user on the system. The command to change the owner of a file is chown. Reference: 1: Chown Command in Linux (File Ownership) | Linuxize 2 3: Linux File Permissions and Ownership Explained with Examples 4 2: 3 Ways to Find File Owner in Linux - howtouselinux 1
NEW QUESTION # 20
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