Go Systems Programming

Using a host name as input

The name of this DNS utility will be lookHost.go and will be presented in three parts. The first part of the lookHost.go utility is the following:

package main 
 
import ( 
   "fmt" 
   "net" 
   "os" 
) 

The second part of the program has the following Go code:

func main() { 
   arguments := os.Args 
   if len(arguments) == 1 { 
         fmt.Println("Please provide an argument!") 
         os.Exit(100) 
   } 
 
   hostname := arguments[1] 
   IPs, err := net.LookupHost(hostname) 

Similarly, the net.LookupHost() function also returns a string slice with the desired information.

The third part of the program has the following code, which is for error checking and printing the output of net.LookupHost():

 if err != nil { fmt.Println(err) os.Exit(100) } for _, IP := range ...