zap: 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/zap - from package: xbase-utils

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

On Debian possible default full paths are:

/usr/bin/zap - from package: dvb-apps
/usr/bin/zap - from package: libxbase64-bin

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

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