dnsget: 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/dnsget - from package: udns

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

On Debian possible default full paths are:

/usr/bin/dnsget - from package: udns-utils

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

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