fauhdlc: 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/fauhdlc - from package: fauhdlc

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

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