get-assigned-hn-by-ip: 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/share/drbl/bin/get-assigned-hn-by-ip - from package: drbl

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

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