filterm: 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/filterm - from package: konwert

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

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