mdump2: 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
/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/mdump2 - from package: med-tools

You may install the required package with command yum install {package}
Error in other languages:
mdump2: bevel nie gevind nie
mdump2: comandă negăsită
mdump2: comando não encontrado
mdump2: commande introuvable
mdump2: command not found
mdump2: käsku ei ole
mdump2: không tìm thấy lệnh
mdump2: komanda nerasta
mdump2: Kommando nicht gefunden.
mdump2: kommandot finns inte
mdump2: komut yok
mdump2: nie znaleziono polecenia
mdump2: níor aimsíodh an t-ordú
mdump2: no se encontró la orden
mdump2: no s'ha trobat l'ordre
mdump2: opdracht niet gevonden
mdump2: parancs nem található
mdump2: perintah tidak ditemukan
mdump2: príkaz nenájdený
mdump2: příkaz nenalezen
mdump2: команда не найдена
mdump2: командата не е открита
mdump2: 命令找不到
mdump2: コマンドが見つかりません