tinydns: 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/tinydns - from package: ndjbdns

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

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