gpg-zip: 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 CentOS possible default full paths are:

/usr/bin/gpg-zip - from package: gnupg2

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gpg-zip - from package: gnupg

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

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