pfsouthdrhtml: 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/pfsouthdrhtml - from package: pfstools

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

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