#define HISNUM 11
#define BUFSIZE 200
typedef struct ENV_HISTROY{
	int start;
	int end;
	char his_cmd[HISNUM][100];
} ENV_HISTORY;typedef struct NODE{	pid_t pid;	char cmd[100];	char state[10];	struct NODE *link;} NODE;

void init_environ();
char *envpath[10],buf[BUFSIZE],*input=NULL;pid_t pid1=0;int sig_flag=0,sig_z=0;
ENV_HISTORY envhis;NODE *head,*end;