sabayon-apply: 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/sbin/sabayon-apply - from package: sabayon-apply

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

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