filepp: 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/filepp - from package: filepp

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

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