hnb: 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/hnb - from package: hnb

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

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