dbwtest: 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/dbwtest - from package: pvm-examples

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

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