drbl-list-tarball: 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/drbl-list-tarball - from package: drbl

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

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