how to add many argv with my command

[slackman]

### check_mac.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}'");
}

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

}

i use c programing for call system command on linux fedora and how to call argv ($1) for filter ip address


check_mac mac_arp 172.168.1.200
result it's show mac address of 172.168.1.200


check_mac ip_arp 00:00:00:00:00:01
result it's show ip address of 00:00:00:00:00:01


(and if i want to add another argv such as check_mac mac_arp 172.168.1.200 $2 $3 $4,how to!!)


i can try this it's not working. please help me

[Cabhan]

If I understand your question correctly, it's about multiple parameters to a C program.

All of the parameters are placed in the argv array. So for instance, if I call:

my_program arg1 arg2 arg3

then my argv array will be:

argv[0] = "my_program"
argv[1] = "arg1"
argv[2] = "arg2"
argv[3] = "arg3"

Furthermore, argc is set to the length of the argv array. So in the above example, argc = 4.

This allows you to write loops that go through every argument:

int i;
for(i = 1; i < argc; i++)
{
    char *arg = argv[i];
    /* ... process arg ... */
}

I hope that this will help point you in the right direction.