pfsrotate: 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/pfsrotate - from package: pfstools

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

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