drbl-ocs: 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/drbl-ocs - from package: clonezilla

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

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