（一）发行版：Ubuntu16.04.7

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（二）记录：

（1）不传参，指定拷贝文件，指定复制到文件

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>int main(int argc,char *argv[])
{
int copya_fd;  
int copyb_fd;
ssize_t read_byte;
ssize_t write_byte;char buff[36]={0};//打开要复制的文件
copya_fd = open("copya.c",O_RDWR);
if(copya_fd == -1)printf("fail to open copya.c\n");
elseprintf("open copya.c successfully:%d\n",copya_fd);
//打开将要复制到的文件
copyb_fd = open("copyb.c",O_RDWR|O_CREAT,0666);
if(copyb_fd == -1)printf("fail to open copyb.c\n");
elseprintf("open copyb.c successfully:%d\n",copyb_fd);
//读取文件内容到buff中
read_byte=read(copya_fd,buff,36);
write_byte=write(copyb_fd,buff,36);
printf("read %d bytes from copya.c\n",read_byte);
printf("write %d bytes to copyb.c\n",write_byte);
//关闭文件
close(copya_fd);
close(copyb_fd);return 0;
}

 makefile

copy:main.cgcc main.c -o copyclean:rm -rf copy copyb.c

 （2）参入文件夹拷贝

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>int main(int argc,char *argv[])
{
int copya_fd;  
int copyb_fd;
ssize_t read_byte;
ssize_t write_byte;char buff[36]={0};if(argc != 3)
{
printf("error number of file\n");
return 0;
}
//打开要复制的文件
copya_fd = open(argv[1],O_RDWR);
if(copya_fd == -1)printf("fail to open copyed\n");
elseprintf("open copyed successfully:%d\n",copya_fd);
//打开将要复制到的文件
copyb_fd = open(argv[2],O_RDWR|O_CREAT,0666);
if(copyb_fd == -1)printf("fail to open copy\n");
elseprintf("open copy successfully:%d\n",copyb_fd);
//读取文件内容到buff中
read_byte=read(copya_fd,buff,36);
write_byte=write(copyb_fd,buff,36);
printf("read %d bytes from copyed\n",read_byte);
printf("write %d bytes to copy\n",write_byte);
//关闭文件
close(copya_fd);
close(copyb_fd);return 0;
}

makefile

copy:main.cgcc main.c -o copychuancan:chuancan.cgcc chuancan.c -o chuancanclean:rm -rf copy copyb.c chuancan

第二种方法中，因为./exe为第一个参数，所以为argv[0]，所以我们传入的参数实际为argv[1]和argv[2]。 所以我们的argv[1]为copya.c，argv[2]为copye.c

./chuancan copya.c copye.c

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（三）命令：