havp: 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/sbin/havp - from package: havp

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

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