源码如下：

#include

#include

#include

#include

int main()

{

struct utmp *u ;

FILE *fp = fopen("shutdown_note","w+");

utmpname("/var/log/wtmp");

while((u = getutent()))

{

if(strncmp(u->ut_user,"shutdown",8) == 0)

fprintf(fp," %s time: %s", u->ut_user, ctime((time_t *)(&u->ut_tv.tv_sec)));

}

endutent();

return 0;