mysql-zrm-purge: 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/mysql-zrm-purge - from package: MySQL-zrm

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

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