thb: 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/thb - from package: pvm-examples

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

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