Go Systems Programming

Finding all the groups a user belongs to

Each user can belong to more than one group: this section will show how to find out the list of groups a user belongs to, given their username.

The name of the utility will be listGroups.go, and it will be presented in four parts. The first part of listGroups.go is the following:

package main 
 
import ( 
   "fmt" 
   "os" 
   "os/user" 
) 

The second part has the following Go code:

func main() { 
   arguments := os.Args 
   var u *user.User 
   var err error 
   if len(arguments) == 1 { 
         u, err = user.Current() 
         if err != nil { 
               fmt.Println(err) 
               return 
         } 

The approach that listGroups.go takes when there are no command-line arguments is similar to the one found in userID.go. However, there is a big difference, as this time you do not ...