autodns-dhcp_cron: 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/sbin/autodns-dhcp_cron - from package: autodns-dhcp

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

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