1.使用标准IO完成两个文件拷贝
#include <head.h>
int main(int argc, const char *argv[])
{//判断输入是否合法if(argc>3){printf("输入不合法\n");return -1;}//定义两个文件指针，用于读写FILE *fp1=NULL;FILE *fp2=NULL;if((fp1=fopen(argv[1],"r"))==NULL){perror("");return -1;}if((fp2=fopen(argv[2],"w"))==NULL){perror("");return -1;}//循环读取搬运while(1){char buf[20];//定义搬运工int res=fread(buf,1,sizeof(buf),fp1);//循环读取字符fwrite(buf,1,res,fp2);//将字符拷贝到第二个文件中if(feof(fp1))//执行上述操作后，判断光标位置{break;//如果光标在结尾则退出循环}}//关闭两个文件fclose(fp1);fclose(fp2);return 0;
}
ubuntu@ubuntu:day3$ ls
04write.c homework1.c stat.c test1.c
ubuntu@ubuntu:day3$ gcc homework1.c
ubuntu@ubuntu:day3$ ./a.out test1.c test2.c
ubuntu@ubuntu:day3$ ls
04write.c a.out homework1.c stat.c test1.c test2.c
ubuntu@ubuntu:day3$
2.使用文件IO完成两个文件的拷贝
#include <head.h>int main(int argc, const char *argv[])
{//判断传入的文件个数if(argc != 3){printf("input file error\n");printf("usage:./a.out srcfile dstfile\n");return -1;}//定义文件描述符变量int srcfd, dstfd;//以只读的形式打开源文件if((srcfd = open(argv[1], O_RDONLY)) ==-1){perror("open srcfile error");return -1;}//以只写的形式打开目标文件if((dstfd = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0664)) ==-1){perror("open dstfile error");return -1;}//不断将源文件中的内容读出，写入的目标文件中//直到源文件全部读取结束char buf[128] = "";while(1){memset(buf, 0, sizeof(buf)); //将容器清空int res = read(srcfd, buf, sizeof(buf)); //从源文件中读取数据write(dstfd, buf, res); //将数据写入目标文件//对读取的数据个数进行判断if(res == 0){break;}}//关闭两个文件close(srcfd);close(dstfd);printf("拷贝成功\n");return 0;
}
ubuntu@ubuntu:day3$ gcc homework2.c
ubuntu@ubuntu:day3$ ./a.out test2.c test3.c
拷贝成功
ubuntu@ubuntu:day3$ diff test2.c test3.c
ubuntu@ubuntu:day3$ 3.实现stat函数
#include <head.h>int main(int argc, const char *argv[])
{//定义文件属性类型的数据struct stat sx; //用于存储获得的文件属性//调用函数的到文件属性stat(argv[1], &sx);switch(sx.st_mode&S_IFMT){case S_IFSOCK:{printf("套接字文件\t");}break;case S_IFLNK:{printf("链接文件\t");}break;case S_IFREG:{printf("普通文件\t");}break;case S_IFBLK:{printf("块设备文件\t");}break;case S_IFDIR:{printf("目录文件\t");}break;case S_IFCHR:{printf("字符设备文件\t");}break;case S_IFIFO:{printf("管道文件\t");}break;}printf("%#o\t%ld\t%ld\n", sx.st_mode&0777, sx.st_size, sx.st_ino);return 0;
}
ubuntu@ubuntu:day3$ gcc homework3.c
ubuntu@ubuntu:day3$ ./a.out test2.c
普通文件 0664 6 667814
ubuntu@ubuntu:day3$ 4.实现目录操作
#include <head.h>int main(int argc, const char *argv[])
{//判断外部传参个数if(argc != 2){printf("input error\n");printf("usage:./a.out name\n");return -1;}//定义目录指针DIR *dp = NULL;//打开目录if((dp = opendir(argv[1])) == NULL){perror("opendir error");return -1;}//读取目录中的文件或目录信息struct dirent *sdp = NULL;while((sdp = readdir(dp)) != NULL){//输出当前文件或目录的信息printf("inode:%10ld, size:%10d, %10s, ",\sdp->d_ino, sdp->d_reclen, sdp->d_name);//输出类型switch(sdp->d_type){case DT_BLK:{printf("b\n");}break;case DT_CHR:{printf("c\n");}break;case DT_DIR:{printf("d\n");}break;case DT_FIFO:{printf("p\n");}break;case DT_LNK:{printf("l\n");}break;case DT_REG:{printf("-\n");}break;case DT_SOCK:{printf("s\n");}break;}}//关闭目录closedir(dp);return 0;
}
ubuntu@ubuntu:day3$ gcc homework4.c
ubuntu@ubuntu:day3$ ./a.out .
inode: 655425, size: 24, .., d
inode: 667813, size: 32, homework4.c, -
inode: 667819, size: 32, homework3.c, -
inode: 667822, size: 32, a.out, -
inode: 667818, size: 32, homework2.c, -
inode: 667816, size: 32, homework1.c, -
inode: 667815, size: 32, test1.c, -
inode: 667812, size: 32, stat.c, -
inode: 667808, size: 24, ., d
inode: 667814, size: 32, test2.c, -
inode: 667811, size: 32, 04write.c, -
inode: 667817, size: 32, test3.c, -
ubuntu@ubuntu:day3$ 
