mupprnt: 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/mupprnt - from package: mup

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

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