OS_command – Custom Linux Process Viewer

Project Overview

OS_command is a C project that implements a custom command called my_ps.
This command merges process information from two standard Linux commands:

• ps aux → Displays all processes with details like USER, PID, CPU, MEM, COMMAND.
• ps -eLf → Displays thread-level details such as PID, LWP, NLWP.

The merged output is written into merged.txt and displayed on the terminal, effectively behaving like a new process viewer.

Features

• Executes system commands using system().
• Reads outputs from files (x1.txt, x2.txt) using fopen(), fscanf().
• Merges process and thread information by PID.
• Writes combined data into merged.txt using fprintf().
• Displays the merged file in the terminal.

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🛠️ Prerequisites

• Linux environment with ps command available.
• Basic knowledge of:
  • File handling (open(), close(), fscanf(), fprintf()).
  • System calls (system()).
  • Process management concepts.

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How to Compile & Run

gcc main.c -o my_ps ./my_ps

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📄 Example Output

USER   PID   COMMAND        LWP   NLWP
root   123   /usr/bin/bash  123   1
user1  456   /usr/bin/vim   789   3

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📂 Repository Contents

• main.c → Source code for my_OS_command.
• main_Output.png → Screenshot of sample output.
• README.md → Project documentation.

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👉 This README gives your repo a professional look and makes it easy for anyone (including your viva examiner) to understand the project quickly.

Would you like me to also add a flow diagram (ASCII or markdown) showing how ps aux + ps -eLf → merge → merged.txt → terminal, so your README looks even more impressive?