dnprint: 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/dnprint - from package: dnet-progs

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

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