maketestzone: 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/maketestzone - from package: dnssec-tools

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

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