mcxdump: 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 Debian possible default full paths are:

/usr/bin/mcxdump - from package: mcl

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

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