tnb: 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/tnb - from package: pvm-examples

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

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