linuxmain函数的入参

#include <stdio.h>

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

    printf("Opening file: %s\n", argv[1]);

    // 这里可以添加打开文件的代码

    return 0;
}

#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    int opt;

    while ((opt = getopt(argc, argv, "abc:")) != -1) {
        switch (opt) {
            case 'a':
                printf("Option a\n");
                break;
            case 'b':
                printf("Option b\n");
                break;
            case 'c':
                printf("Option c with value '%s'\n", optarg);
                break;
            case '?':
                fprintf(stderr, "Usage: %s [-a] [-b] [-c value]\n", argv[0]);
                return 1;
        }
    }

    return 0;
}