zypp-refresh: command not found

Have You tried accessing the binary with the full path?

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/sbin/zypp-refresh - from package: zypper

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