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/*execlp.c*/ 
#include  
#include  
#include  
 
int main() 
{ 
	if(fork()==0){ 
/*调用execlp函数，这里相当于调用了“ps -ef”命令*/ 
		if(execlp("ps","ps","-ef",NULL)<0) 
			perror("execlp error!"); 
	} 
}