zrm-pre-scheduler: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/zrm-pre-scheduler - from package: MySQL-zrm

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