zmap: 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/sbin/zmap - from package: zmap

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

On Debian possible default full paths are:

/usr/sbin/zmap - from package: zmap

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

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