zg-policy-rc.d: 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/zg-policy-rc.d - from package: policyrcd-script-zg2

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