#include "apue.h" #include int main(void) { int status; if ((status = system("date")) < 0) err_sys("system() error"); pr_exit(status); if ((status = system("nosuchcommand")) < 0) err_sys("system() error"); pr_exit(status); if ((status = system("who; exit 44")) < 0) err_sys("system() error"); pr_exit(status); exit(0); }