C 語言實現 cp

//linux cp
#include <stdio.h>
int main(int argc,char *argv[])
{
	if (argc!=3)
 {
 		printf("improper usage input_file output_file\n");
 		return 1;
	}
	char *input=argv[1];
	char *output=argv[2];
	
	FILE *in=fopen(argv[1],"r");
	FILE *out=fopen(argv[2],"w");
	char ch;
	while ((ch=fgetc(in))!=EOF)
		fputc(ch,out);
	fclose(in);
	fclose(out);
	}	

Linux cp 功能用C語言實現。