mupdisp: 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/mupdisp - from package: mup

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

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