#include<unistd.h>#include<stdio.h>#include<stdlib.h>intmain(intargc,char*argv[]){pid_tpid;pid=fork();if(pid==0)//子进程{execl("/bin/ls","ls","-al","/etc/passwd",(char*)0);//执行bin下的ls命令，查找etc下的passwd文件，参数为lsexit(0);}else{execl("/bin/ls","ls","-al","./exam702fork.c",(char*)0);//执行bin下的ls命令，查找当前文件夹下的exam81getpid.c文件exit(1);}return0;}