#include <stdio.h>

int main(int argc, char **argv)
{
FILE *fp;
int offset;
char buf[100];
int len;

fp=fopen(argv[1], "r");
offset=strtol(argv[2], NULL, 0);

fseek(fp, -offset, SEEK_END);
while((len=fread(buf, 1, 100, fp))!=0)
{
fwrite(buf, 1, len, stdout);
}
}