redet: command not found

Have You tried accessing the binary with the full path?

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/redet - from package: redet

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