drr: 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/bin/drr - from package: plastimatch

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

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