ex4

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>

#define MAX_INPUT_SIZE 1024

int main() {
    char input[MAX_INPUT_SIZE];

    while (1) {
        printf("MyShell> ");
        fgets(input, MAX_INPUT_SIZE, stdin);

        // Remove newline character
        input[strlen(input) - 1] = '\0';

        if (strcmp(input, "exit") == 0) {
            printf("Exiting MyShell...\n");
            break;
        }

        pid_t child_pid = fork();

        if (child_pid == -1) {
            perror("fork");
            return 1;
        } else if (child_pid == 0) {
            // Child process

            // Tokenize the input into arguments
            char *args[MAX_INPUT_SIZE / 2];
            int arg_count = 0;

            char *token = strtok(input, " ");
            while (token != NULL) {
                args[arg_count] = token;
                arg_count++;
                token = strtok(NULL, " ");
            }

            args[arg_count] = NULL;

            // Check if the last argument is "&" for running in the background
            int run_in_background = 0;
            if (arg_count > 0 && strcmp(args[arg_count - 1], "&") == 0) {
                run_in_background = 1;
                args[arg_count - 1] = NULL; // Remove the "&" from arguments
            }

            // Execute the command
            if (execvp(args[0], args) == -1) {
                perror("execvp");
                exit(1);
            }
        } else {
            // Parent process

            // If not running in the background, wait for the child to finish
            if (strcmp(input, "") != 0 && input[strlen(input) - 1] != '&') {
                wait(NULL);
            }
        }
    }

    return 0;
}