c programing on linux help me!!

[slackman]

#### test.c#####

#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main(int argc, char **argv )
{

if(strcmp(argv[1],"mac_arp")==0)
{
system("arp -en | grep $1 | awk '{print $3}'");
}

}

this program for search mac address with ip address

command to use: test mac_arp 172.168.1.200
result: "it's show mac address of 172.168.1.200"


it's red color i try to define to argv for receive "172.168.1.200".it's dont work.

it not working!! how to change something for working.
** i don't want to use with shell script i need to use c programing only. Thank!!

[lonny]

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define err perror

int main(int argc, char **argv)
{
char buf[1024];

if (argc < 2)
{
err("argc < 2");
return -1;
}

memset(buf, '\0', sizeof(buf));
snprintf(buf, sizeof(buf), "arp -en | grep %s | awk '{print $3}'", argv[1]);
system(buf);

return 0;
}

[slackman]

thank!! for help. But it's dont work for me.
you program: test 172.168.1.200
but i want : test mac_arp 172.168.200