scotch_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 CentOS possible default full paths are:

/usr/bin/scotch_mtst - from package: scotch

You may install the required package with command yum install {package}

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