open a file in from terminal

#include <stdio.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    FILE *file = fopen(argv[1], "r");
    if (file == NULL) {
        perror("Error opening file");
        return 2;
    }

    // Your code to process the file goes here

    fclose(file);
    return 0;
}