matroxset: 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/matroxset - from package: matroxset

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

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