edusers: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/edusers - from package: mailagent

You may install the required package with command apt-get install {package}

Error in other languages:
edusers: bevel nie gevind nie
edusers: comandă negăsită
edusers: comando não encontrado
edusers: commande introuvable
edusers: command not found
edusers: käsku ei ole
edusers: không tìm thấy lệnh
edusers: komanda nerasta
edusers: Kommando nicht gefunden.
edusers: kommandot finns inte
edusers: komut yok
edusers: nie znaleziono polecenia
edusers: níor aimsíodh an t-ordú
edusers: no se encontró la orden
edusers: no s'ha trobat l'ordre
edusers: opdracht niet gevonden
edusers: parancs nem található
edusers: perintah tidak ditemukan
edusers: príkaz nenájdený
edusers: příkaz nenalezen
edusers: команда не найдена
edusers: командата не е открита
edusers: 命令找不到
edusers: コマンドが見つかりません