simcrs: 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/simcrs - from package: simcrs

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

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