drblpush: 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/drblpush - from package: drbl

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

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