xmdump2: 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/xmdump2 - from package: med-tools

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

Error in other languages:
xmdump2: bevel nie gevind nie
xmdump2: comandă negăsită
xmdump2: comando não encontrado
xmdump2: commande introuvable
xmdump2: command not found
xmdump2: käsku ei ole
xmdump2: không tìm thấy lệnh
xmdump2: komanda nerasta
xmdump2: Kommando nicht gefunden.
xmdump2: kommandot finns inte
xmdump2: komut yok
xmdump2: nie znaleziono polecenia
xmdump2: níor aimsíodh an t-ordú
xmdump2: no se encontró la orden
xmdump2: no s'ha trobat l'ordre
xmdump2: opdracht niet gevonden
xmdump2: parancs nem található
xmdump2: perintah tidak ditemukan
xmdump2: príkaz nenájdený
xmdump2: příkaz nenalezen
xmdump2: команда не найдена
xmdump2: командата не е открита
xmdump2: 命令找不到
xmdump2: コマンドが見つかりません