pfni: 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/pfni - from package: adacontrol

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

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