getds: 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/getds - from package: dnssec-tools

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

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