pfsintiff: command not found

Have You tried accessing the binary with the full path?

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/lib/debug/usr/bin/pfsintiff - from package: pfstools-dbg
/usr/bin/pfsintiff - from package: pfstools

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