users.go

package main

import (
	"fmt"
	"log"
	"sort"

	"github.com/EricLagergren/go-gnulib/utmp"
)

func main() {
	utmps, err := utmp.ReadUtmp(utmp.UtmpFile, 2, utmp.CheckPIDs)
	if err != nil {
		log.Fatalln(err)
	}

	names := make([]string, 0, len(utmps))
	for _, u := range utmps {
		if u.IsUserProcess() {
			names = append(names, u.ExtractTrimmedName())
		}
	}
	sort.Strings(names)
	for _, name := range names {
		fmt.Println(name)
	}
}