aft: 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/aft - from package: aft

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

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