mpage: 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/mpage - from package: mpage

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

On Debian possible default full paths are:

/usr/bin/mpage - from package: mpage

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

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