Golang : Get all local users and print out their home directory, description and group id



Tags : golang home-directory os-user local-user-list

In this short tutorial, we will explore how to get a list of users from the local machine and iterate each one of them to find out their home directory, group ID and description. The code is pretty much self-explanatory and please take note that the code can only be executed on Linux/Unix machine as it will parse the /etc/passwd file to get the users list. For Windows machine, please see https://www.nextofwindows.com/the-net-command-line-to-list-local-users-and-groups. You can dump out the net users output to a text file first and then parse the text file to build the users list from there. Here you go! package main import ( "bufio" "fmt" "io" "os" "os/user" "strings" ) var Users []string func main() { // this is for Linux/Unix machines // for Windows // see https://www.nextofwindows.com/the-net-command-line-to-list-local-users-and-groups file, err := os.Open("/etc/passwd") if err != nil { fmt.Println(err) os.Exit(1) defer file.Close() reader := bufio.NewReader(file) for { line, err := reader.ReadString('\n') // skip all line starting with # if equal := strings.Index(line, "#"); equal < 0 { // get the username and description lineSlice := strings.FieldsFunc(line, func(divide rune) bool { return divide == ':' // we divide at colon ) if len(lineSlice) > 0 { Users = append(Users, lineSlice[0]) if err == io.EOF { break if err != nil { fmt.Println(err) os.Exit(1) // now we have a list of users // iterate(cycle) each of them to // print out HomeDir, GroupID, description, etc for _, name := range Users { usr, err := user.Lookup(name) if err != nil { panic(err) // see https://golang.org/pkg/os/user/#User fmt.Printf("username:%s\n", usr.Username) fmt.Printf("homedir:%s\n", usr.HomeDir) fmt.Printf("groupID:%s\n", usr.Gid) fmt.Printf("DisplayName:%s\n", usr.Name) fmt.Println("*********************************") Hope this helps and happy coding! References: https://www.socketloop.com/tutorials/golang-how-to-get-a-user-home-directory-path#comment-3195013804 https://www.socketloop.com/references/golang-bytes-fieldsfunc-function-example https://www.socketloop.com/tutorials/golang-skip-or-discard-items-of-non-interest-when-iterating-example https://golang.org/pkg/strings/#FieldsFunc

  See also : Golang : Reverse IP address for reverse DNS lookup example



Tags : golang home-directory os-user local-user-list

By Adam Ng

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