nfctool: 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/nfctool - from package: neard-tools

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

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