mwlQuery: 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/mwlQuery - from package: ctn

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

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