RunSimTest: 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/RunSimTest - from package: ibutils

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

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