hv3: 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/hv3 - from package: hv3

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

Error in other languages:
hv3: bevel nie gevind nie
hv3: comandă negăsită
hv3: comando não encontrado
hv3: commande introuvable
hv3: command not found
hv3: käsku ei ole
hv3: không tìm thấy lệnh
hv3: komanda nerasta
hv3: Kommando nicht gefunden.
hv3: kommandot finns inte
hv3: komut yok
hv3: nie znaleziono polecenia
hv3: níor aimsíodh an t-ordú
hv3: no se encontró la orden
hv3: no s'ha trobat l'ordre
hv3: opdracht niet gevonden
hv3: parancs nem található
hv3: perintah tidak ditemukan
hv3: príkaz nenájdený
hv3: příkaz nenalezen
hv3: команда не найдена
hv3: командата не е открита
hv3: 命令找不到
hv3: コマンドが見つかりません