unbound-control-setup: 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/unbound-control-setup - from package: unbound

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

On Debian possible default full paths are:

/usr/sbin/unbound-control-setup - from package: unbound

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

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