zp: 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 Debian possible default full paths are:

/usr/bin/zp - from package: zp

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

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