openct-control: 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/openct-control - from package: openct

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

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