Linux Commands
What command gives you admin access?
sudo su
Command you would use to get a md5 hash of a file
md5sum
Directory in Linux where all users have their files saved?
/home
EXAMPLE: /home/student
Restricts a user from using the same password within a certain time frame
Password History
Command to see hidden files
ls -alh
OR
ll
When a password is hashed using SHA256, it cannot be reversed.
True or False
True
File in Linux that contains rules that specify which users are allowed to run commands with sudo.
(Use the whole file pathway)
/etc/sudoers
MFA stands for _____ ______ ______________
Multi-Factor Authentication
What command would you use to change a user password?
passwd
How many Hexadecimal characters are in every md5 hash?
32
File in Linux that shows every users home folder path AND whether or not they have login shell
(whole file pathway)
/etc/passwd
Authenticate with one Username and Password in order to gain access to multiple services or sites
SSO
OR
Single Sign On
ufw enable
Passwords are usually stored as plain text in Linux OS
True or False
False
Passwords are never stored as plain text
File in Linux that stores user passwords as salted hashes
/etc/shadow
Something you Know
Something you Are
Something you Have
These are all ......
MFA
OR
Multi-Factor Authentication
What command would you use to lock the root account?
(Use the whole command)
passwd -l root
OR
usermod -L root
While you can't reverse a hash, hashes of common passwords can be 'cracked'
True or False
True.
DO NOT USE COMMON PASSWORDS!!!
Directory in Linux that contains files to be copied to a new user's home directory when a user is first created
/etc/skel
What file do you go to in order to change the Minimum and Maximum password age default for new users?
/etc/login.defs