plzip: 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/plzip - from package: plzip

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

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