zypper-log: 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/zypper-log - from package: zypper

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