#include<stdio.h>#include<unistd.h>#include<stdlib.h>intmain(intargc,char*argv[]){pid_tpid;//进程标识符printf("**Thisisatestforexecseriesfun**\n");//打印提示符if(fork()==0)//创建一个子进程{execl("/bin/date","/bin/date",(char*)0);//使用execl函数调用date命令exit(0);//退出}else{sleep(1);//主进程休眠execl("/bin/time","/bin/time",(char*)0);}exit(0);}