scotch_gtst: 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_gtst - from package: scotch

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

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