nfc-emulate-tag: 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/nfc-emulate-tag - from package: libnfc-examples

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

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