rootd: 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/rootd - from package: root-rootd

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

On Debian possible default full paths are:

/usr/bin/rootd - from package: root-system-rootd

You may install the required package with command apt-get install {package}

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