clausefilter: 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/clausefilter - from package: ladr4-apps

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

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