文件操作举例

cat功能的实现

#include <stdio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{ 
	int temp;
	FILE *fpr;
	if(argc==1)
	{ 
		printf("Parameter missing!\n");
		exit(0);
	}
	if((fpr=fopen(argv[1],"r"))==NULL)
	{ 
		printf("Can not open the source file!\n");
		exit(0);
	}
	fseek(fpr,0L,0);
	while(!feof(fpr))
	{ 
		temp=fgetc(fpr);
		putchar(temp);
	}
	fclose(fpr);
	return 0;
}

删除文件功能的实现

#include <stdio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{ 
	int res;
	if(argc==1)
	{ 
		printf("Parameter missing!\n");
		exit(0);
	}
	res = remove( argv[1] );
	if(res == 0)
	{ 
		printf("deleted!\n");
		exit(0);
	}
	else if(res == -1)
	{ 
		printf("error happend!\n");
		exit(0);
	}
	return 0;
}

cp功能的实现

#include <stdio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{ 
	char c;
	FILE *fp1, *fp2;
	if(argc<=2)
	{ 
		printf("Parameter missing!\n");
		exit(0);
	}
	if((fp1=fopen(argv[1],"rb"))==NULL)
	{ 
		printf("Can not open the source file!\n");
		exit(0);
	}
	if((fp2=fopen(argv[2],"a+"))==NULL)
	{ 
		printf("Can not establish the output file!\n");
		exit(0);
	}
	fseek(fp1,0L,0);
	fseek(fp2,0L,0);
	while(!feof(fp1))
	{ 
		fread(&c, 1, 1, fp1);
		fwrite(&c, 1, 1, fp2);
	}
	fclose(fp1);
	fclose(fp2);
	return 0;
}