openct-tool: 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/openct-tool - from package: openct

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

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