pfsoutpfm: 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/pfsoutpfm - from package: pfstools

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

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