nftl_format: 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/sbin/nftl_format - from package: mtd-utils

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

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