decode: 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/rnews.libexec/decode - from package: inn2-inews

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

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