pfsflip: 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/pfsflip - from package: pfstools

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

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