realminit: 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/realminit - from package: dnssec-tools

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

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