时间以及执行所有命令行参数

#include <stdio.h>
#include <stdlib.h>
#include <sys/times.h>
#include <unistd.h>


static void do_cmd( char * );
static void pr_times( clock_t, struct tms *, struct tms  *);

int main( int argc, char *argv[] )
{
	int	i;

	setbuf( stdout, NULL );
	for( i = 1; i < argc; i++ )
		do_cmd( argv[i] );
	exit( 0 );

}

static void do_cmd( char *cmd )
{
	struct tms	tmsstart, tmsend;
	clock_t	start,	 end;
	int		status;

	printf( "\ncommand: %s\n", cmd );

	if( (start = times( &tmsstart )) < 0 )
		printf( "times error\n" );

	if( (status = system( cmd )) < 0 )
		printf( "system error\n" );

 	if(( end = times( &tmsend ) ) < 0 ) 
		printf( "times error\n" );
	

	pr_times( end - start, &tmsstart, &tmsend );
	
}

static void pr_times( clock_t real, struct tms *tmsstart, struct tms *tmsend )
{
	static	long	clktck = 0;
	
	if( clktck == 0 )
		if(( clktck = sysconf(_SC_CLK_TCK ) ) < 0 )
			printf( "sysconf error\n" );

	printf( "	real:	%7.2f\n", real / ( double )clktck );
	printf( "	user:	%-7.2f\n",
		(double)(tmsend->tms_utime - tmsstart->tms_utime) / clktck );

	printf( "	sys:	%7.3f\n",
		(double)(tmsend->tms_stime - tmsstart->tms_stime ) / clktck );
	

}	

运行结果如下：

wangkai@ubuntu:~/Test$ ./a.out "sleep 5" "date"

command: sleep 5
	real:	   5.00
	user:	0.00   
	sys:	  0.000

command: date
2012年 05月 26日 星期六 06:07:43 PDT
	real:	   0.01
	user:	0.00   
	sys:	  0.000
wangkai@ubuntu:~/Test$