rredtool: 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/rredtool - from package: reprepro

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

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