dt-getname: 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/dt-getname - from package: dnssec-tools

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

On Debian possible default full paths are:

/usr/bin/dt-getname - from package: libval-bin

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

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