mtst-long: 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-long - from package: scotch

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

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