#include <stdio.h> 


char *fgets(char *s, int size, FILE *stream);
		

#include <stdio.h>

#include <string.h>
#include <unistd.h>

int main(int argc, char **argv)
{
    FILE *fp_stdin;
    FILE *fp_out;

    char buf_in[255];

    if (argc != 2)
    {
        printf("Usage : ./line_edit [저장파일이름]\n");
        exit(0);
    }

    if (access(argv[1], F_OK) == 0) 
    {
        printf("이미 파일이 존재하고 있음 : %s\n", argv[1]);
        exit(0);
    }

    fp_out  = fopen(argv[1], "w");    
    if (fp_out == NULL)
    {
        perror("file open error 1 : ");
        exit(0);
    }

    while(fgets(buf_in, 255, stdin) != NULL)
    {
        if ( strncmp(buf_in,"quit\n", 5) == 0)
            break;
        fputs(buf_in, fp_out); 
    }

    fclose(fp_out);
}