Process Management Commands

Duration: 12 min

This video lesson is available to enrolled students.

Return to /learn/UPPSC-COMPUTER-OPERATOR-GRADE-B/operating-system/unix-os/essential-commands/asset-process-management-commands after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Reading Comprehension, Vocabulary, Idioms and Phrases, Narrative Sequencing, Critical Reasoning
  2. Reasoning and Aptitude: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Seating Arrangements, Puzzle Solving (Puzzles), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Sufficiency, Selection Decision Table (Decision Making), Calendar, Clock, Cubes & Dices, Data Arrangement, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning), Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mensuration and Geometry, Arithmetic, Mixture and Alligation, Age Problems, Data Interpretation, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Logical Deduction and Induction, Simplification and Approximation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Algebra, Traverse Surveying, Clocks and Calendars, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Ratio and Proportion, Mensuration, Permutations and Combinations, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Probability, Trigonometry, Measurement and Quantity Take-Off, Statistics, Data Sufficiency, Blood Relations, Speed, Time and Distance, Time and Work, Data Interpretation, Sequence and Series (Series), Algebra, Permutation and Combination, Combinatorics
  3. General Awareness: Physics, Chemistry, Biology, Geography, History, Polity, Indian Economy
  4. Computer Fundamentals: Basics of COA, Number System, Number Representation, Semiconductor Memories and Programmable Logic, Timing, Hazards and Testing, Processor Organization and Instructions, Number Systems and Codes, Combinational Logic Design, Combinational Logic Circuits, Number Systems and Codes
  5. Operating System: Introduction to OS, Unix OS, Linux OS
  6. C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  7. OOPS with C++ & Java: OOPS with C++, Java
  8. Database Management System: Basics of DBMS, SQL
  9. MS Office: MS Office Applications
  10. Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces Unix process management commands, focusing on tools for monitoring and controlling system processes. The instructor begins by defining the 'ps' command as a utility that displays information about currently running processes at a specific snapshot in time. A comparative table is presented alongside handwritten annotations to distinguish between 'ps', 'top', 'kill', and 'pkill'. The session progresses through live monitoring with the 'top' command, which provides real-time statistics on CPU and memory usage. Subsequent sections cover process termination using 'kill' with Process IDs (PIDs) and 'pkill' by name, followed by priority management via 'nice', 'renice', and 'killall'. The lecture concludes with specialized search tools like 'pgrep' for finding processes by name and the 'jobs' command for managing background tasks within a terminal session.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture opens with an introduction to the 'ps' command, defined on-screen as a tool that shows information about processes currently running on the system. The instructor emphasizes the phrase 'currently running' to clarify that this command captures a static snapshot rather than live data. A slide titled 'Process Management Unix Commands' displays a comparison table listing 'ps', 'top', 'kill', and 'pkill'. Handwritten notes appear next to the 'ps' entry, adding '(screenful)' to describe its output format. The visual presentation includes terminal examples for 'ps aux', highlighting how the command lists active processes with specific columns.

  2. 2:00 – 5:00 02:00-05:00

    The instructor shifts focus to the 'top' command, explaining that it provides a live view of running processes and displays CPU and memory usage statistics in real-time. The slide contrasts this with 'ps' by showing a terminal output example where the command continuously updates system resource consumption. Red underlines emphasize key terms like 'live view' and 'CPU and memory'. The instructor discusses the utility of 'top' for monitoring system performance dynamically. Terminal examples illustrate specific columns such as PID, %CPU, and %MEM, which are critical for identifying resource-intensive processes. The section reinforces the distinction between static snapshots ('ps') and dynamic monitoring ('top').

  3. 5:00 – 10:00 05:00-10:00

    This segment covers process termination and priority management. The instructor explains the 'kill' command, which stops a running process using its Process ID (PID), with handwritten notes adding '(pid)' to the description. The 'pkill' command is introduced as a method to stop processes by name instead of PID, with the term 'forcefully' annotated for emphasis. The lecture then introduces 'killall', which terminates all processes with a specified name, and 'renice' to change the priority of an already running process. Terminal examples show commands like 'killall -9 firefox' and 'renice -n 5 1234'. The instructor also explains the 'nice' command for starting new processes with a specified priority level and demonstrates process hierarchy visualization using 'pstree'.

  4. 10:00 – 12:17 10:00-12:17

    The final section details two additional commands: 'pgrep' and 'jobs'. The instructor explains that 'pgrep' searches for a running process by name and displays its Process ID (PID), illustrated with an example output searching for 'firefox'. The 'jobs' command is defined as a tool that lists all background jobs currently running or stopped in the current terminal session. Visual examples show output formats including job status codes like 'Running' and 'Stopped', along with their corresponding PIDs. The slide presents the syntax 'user@unix:~$ jobs' and a table-like output structure '[JOB] STAT PID COMMAND'. This concludes the overview of process management utilities, focusing on search and background job tracking.

The lecture systematically builds a framework for Unix process management, moving from observation to control. It begins with 'ps' and 'top' as observational tools, distinguishing between static snapshots and live monitoring of CPU/memory usage. The progression then shifts to control mechanisms: 'kill' and 'pkill' for termination, with a clear distinction between using Process IDs versus process names. Priority management is addressed through 'nice', 'renice', and 'killall', demonstrating how system resources can be allocated or reclaimed. The session concludes with specialized utilities like 'pgrep' for targeted searching and 'jobs' for managing background tasks within a shell session. Key visual cues include terminal output examples, red underlines emphasizing critical terms like 'currently running' and 'live view', and handwritten annotations clarifying flags such as '(pid)' or '(screenful)'. The consistent use of command syntax and output examples grounds the theoretical definitions in practical application.

Loading lesson…