kup: 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/kup - from package: kup

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

On Debian possible default full paths are:

/usr/bin/kup - from package: kup-client

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

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