rmanage: 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/rmanage - from package: rmanage

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

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