operating-system

This repository contains a collection of shell scripts and C programs related to basic operating system functionalities. Each experiment is organized into separate folders (Exp 1 to Exp 8). Here's a brief overview of each experiment:

Exp 1: Basic Calculator

• Script: basicCalculator.sh
• Description: This shell script implements a basic calculator functionality allowing users to perform addition, subtraction, multiplication, and division.

Exp 2: Combinations and File Comparison

• combinations.sh: Generates all combinations of the numbers 1, 2, and 3.
• fileCompare.sh: Compares two input files and determines if they are the same.

Exp 3: End of Script and Reverse Number

• endOfScriptAtEND.sh: Allows the user to input lines into a file until they type "end" or "END."
• reverseNumber.sh: Reverses a user-input number.

Exp 4: Head and Tail Commands

• scriptOfHead.sh: Simulates the head command of bash.
• scriptOfTail.sh: Simulates the tail command of bash.

Exp 5: Directory Management

• Script: Exp5.sh
• Description: Manages directories with features such as listing directories, creating directories, modifying directories, and navigating.

Exp 6: Database Management System (DBMS)

• database.txt: Database file to store student details.
• DBMS.sh: Manages student details in the database, allowing for addition, deletion, and modification.

Exp 7: Fork Process in C

• File: Exp7.c
• Description: C code demonstrating the use of the fork system call to create child processes and obtain process IDs.

Exp 8: Custom Grep Command

• grep.c: A C program replicating the grep command in Linux.
• test.txt: A sample text file with 10 lines for testing the custom grep command.

How to Execute Grep Command:

• Compile the grep.c file.
• Run the compiled executable with the following commands:
• ./grep test.txt contains life (to find lines containing "life").
• ./grep test.txt notcontains life (to find lines not containing "life").
• ./grep test.txt print (to print the entire text file).

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Feel free to explore each experiment folder for detailed scripts and functionalities. If you encounter any issues or have suggestions, please open an issue in the repository.