mtst: 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/mtst - from package: scotch

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

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