User Management Commands
Duration: 5 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- About the course: About the Course
- General Knowledge: Polity, Physics, Biology, State Wise GK, Chemistry, History, Geography, GK- Current Affairs, Indian Economy, Static General Knowledge, Environment, Evolution of Indian Banking (Banking & Financial Awareness)
- Mental Aptitude and Reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Vocabulary, Profit and Loss, Arithmetic, Mental Ability, Percentage, Algebra, Mensuration and Geometry, Age Problems, Clock, Calendar, Verbal Analogy (Word Based Analogy), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Analogy, Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Selection Decision Table (Decision Making), Cubes & Dices, Blood Relations, Venn Diagram, Logical Sequence Of Words, Inequality, Directions (Direction Test), Data Arrangement, Facts, Inference and Judgements, Syllogisms, Seating Arrangements, Ranking, Order and Sequence
- CS | Computer Fundamentals: Basics of COA, Number System, Number Representation, C Fundamentals, Algorithm Analysis, Input Output Organisation
- CS | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, SQL
- CS | Workplace productivity Tools: MS Office Applications, Keyboard Shortcuts
- CS | Computer Networks: Introduction to CN, Data Communication, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, Application Layer, Hardware Basics, Network Security
- CS | The Internet: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Web Publishing & Hosting, Server Side & Security, Emerging Technologies
- CS | Emerging Technologies: Artificial Intelligence, Emerging Tech Trends, Introduction to OS, Windows OS, Linux OS, Unix OS, JavaScript-Basics
- CS | Boolean algebra: Digital Systems & Boolean Basics, Boolean Expression, Boolean Minimization, Logic Gates & Hardware
- CS | Data Structures: Introduction to DS, Array, Stack, Queue
- CS | Cryptography: Society, Law & Ethics, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security
- UP Police Previous Year Papers:
- UP Police Full Mock Tests:
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
This lecture introduces Linux user management commands using a structured table format. The first half covers identity inspection commands: whoami, which displays the current logged-in username; who, which lists all currently logged-in users with terminal and login details; and id, which reports user ID, group ID, and supplementary groups. The instructor uses red annotations to connect each command to its terminal output. The second half shifts to administrative commands: passwd for changing the current user's password, sudo useradd alice for creating a new account, and sudo userdel alice for removing it. Verification is shown using id alice before and after deletion. A note emphasizes that most user management commands require superuser privileges.
Chapters
0:00 – 2:00 00:00-02:00
The slide titled 'User Management Commands' presents a table for whoami, who, and id. The instructor highlights the on-screen text 'Display the current logged-in username' for whoami and points to its output. Red annotations connect the command user@linux:~$ whoami to the result 'user'. The who command is then emphasized, with its description 'Show all currently logged-in users' and output columns such as USER and TTY highlighted to explain session details.
2:00 – 5:00 02:00-05:00
The lecture continues with the id command, using red boxes to outline user ID, group ID, and groups in its output. The focus then shifts to administrative commands passwd, useradd, and userdel. The table shows 'Change the password of the current user' for passwd. For useradd, the example sudo useradd alice is demonstrated, followed by verification with id alice showing output like 'uid=1001(alice) gid=1001(alice)'. The userdel command is then shown with sudo userdel alice, and id alice confirms the account no longer exists. A note states most commands require superuser privileges.
5:00 – 5:21 05:00-05:21
The final segment displays the static slide for passwd, useradd, and userdel. The instructor gestures toward the terminal examples in the bottom right corner. The visible table reiterates 'Add a new user to the system' and 'Delete a user from the system', with red underlines emphasizing key command names. The example output for id alice remains visible, reinforcing the verification method after user creation and deletion.
The lesson follows a clear progression from read-only identity commands to privileged administrative actions. First, whoami, who, and id establish how users inspect their own identity and system sessions. The use of red arrows and boxes helps map command syntax to specific output fields, such as TTY columns for who and UID/GID values for id. Second, passwd, useradd, and userdel demonstrate account lifecycle management. The worked example of adding 'alice' and then deleting her provides a complete cycle, with id alice serving as the verification tool at each stage. The recurring note about superuser privileges is a key exam point, distinguishing commands that require sudo from those that do not. The table format consistently organizes command name, function, and example output for easy revision.