Data Analyst Vs Business Analyst Vs Data Engineer Vs BI Specialist

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  Data Science - Complete Track • Step 1 - Identify the business problem/value addition/question – ( Data Insights ) this has to be the starting point. • Step 2 - Data availability ( Data Governance ) - Have the structure of your data set defined – The real challenge starts here-                o Do we have the data?                o Do we have access to the required data? • Step 3 -Getting Data ( Data Mining / Data Pipeline ) – How to collect the data from different sources in the system • Step 4 - Data preparation (ETL / ELT) – Once you have data there will be lot of cleaning and preparation required, reduce/increase/combine/split the predictors, determine and eliminate outliers, populate missing values convert few categorical variables into numerical etc. • Step 5 –Exploratory Data Analysis (EDA) – In this step we do descriptive and diagnostic analysis of the existing data. We build multiple graphs that give us direction towards the next steps of predictive analytics. We migh
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First Commands After Installing Kali Linux

first-commands-after-installing-kali-linux


IMPORTANT POINTS TO BE NOTED:


Sudo stands for either “substitute user do” or “super user do”

"root" (aka "superuser") is the name of the system administrator account.

Root user has user id 0 and nominally has unlimited privileges.

Root can access any file, run any program, execute any system call, and modify any setting.

The "sudo" command lets you execute commands with superuser privileges as long as your

user id is in the sudoers file, giving you the necessary authorization.


Enable Root Login and Set Kali Root Password:

Check Login User

                                        whoami

                                        sudo apt update

                                        sudo apt install kali-root-login

Login as Root in the Terminal

                                        sudo -i

Check Login User Again

                                    whoami

Set the Kali Linux Root Password

                                    passwd

                                    exit

Click Log Out

Login as root with its password


User Accounts Management

Create a New Normal User in the terminal

                                useradd -m username

-m creates a home directory for the user.

Set a password for the user

                                passwd username

OR

                                sudo password username

Specify the shell for new user

                                chsh -s /bin/bash username

Delete a Normal User

                                sudo deluser username

Delete the user's home directory and its contents

                                sudo deluser --remove-home username

Grant Sudo Privileges to a Regular or Normal User

                                sudo usermod -aG sudo username

The option -a means to add and ‘-G sudo’ means to add the user to the sudo group.

OR

                                usermod -a -G sudo username


To verify a User Added in "sudo" group is Working

Creates a New Folder or Directory "xyz"

                                sudo mkdir /xyz

Remove Directory or Folder

For Empty folder

                                rmdir dirname

For Non-Empty folder

                                rm -r dirname

Remove sudo privileges of a User

                                sudo deluser username sudo

OR

                                sudo gpasswd -d username sudo

Verify the user "username" has been really removed from sudo group using command:

                                 sudo -l -U username


FIND USER ACCOUNT INFO:

1. id Command

id is a simple command line utility for displaying a real and effective user and group IDs.

                                id username

2. groups Command

groups command is used to show all the groups a user belongs to like this.

                                groups username

3. lslogins Command

lslogins command shows information about known users in the system.

-u flag only displays user accounts.

                                lslogins -u

4. users Command

users command shows the usernames of all users currently logged on the system.

                                users

5. who Command

who command is used to display users who are logged on the system.

Including the terminals they are connecting from.

                                who -u

6. w Command

w command shows all users who are logged on the system and what they are doing.

                                w

7. last or lastb commands

last/lastb commands displays a list of last logged in users on the system.

                                last

                                last -a

                                last -ap now

-a show host name on the last column

-p show all users present at a specified time

8. lastlog Command

lastlog command is used to find the details of a recent login of all users or of a given user.

                                lastlog

                                lastlog -u username

-u show lastlog records for a specific user







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