zonecheck: 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/zonecheck - from package: zonecheck

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

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