scotch_atst: 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_atst - from package: scotch

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

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