radius: 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/lib/news/bin/auth/passwd/radius - from package: inn2

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

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