hercules-run: command not found

Have You tried accessing the binary with the full path?

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/sbin/hercules-run - from package: hercules

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