xmdump: 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/xmdump - from package: med-tools

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

On Debian possible default full paths are:

/usr/bin/xmdump - from package: libmed-tools

You may install the required package with command apt-get install {package}

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