rollinit: 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/rollinit - from package: dnssec-tools

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

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