shell.h

#ifndef SHELL_H              // Prevent multiple inclusion: if SHELL_H is not defined
#define SHELL_H              // Define SHELL_H now

#include <stdio.h>           // Standard I/O functions (e.g., printf, fgets)
#include <stdlib.h>          // General utilities (e.g., exit, malloc)
#include <string.h>          // String functions (e.g., strtok, strcmp)
#include <unistd.h>          // POSIX functions (e.g., fork, exec)
#include <sys/wait.h>        // For wait() function to wait for child processes

#define MAX_INPUT 1024        // Define a constant for max input length
#define MAX_ARGS 64           // Define a constant for max number of arguments

void execute_command(char *input);   // Function to execute parsed command
void print_error(const char *msg);   // Function to print error messages

#endif                        // End of ifndef/define block