devdiscover: 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/torrus/bin/devdiscover - from package: torrus-common

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

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