ledctl: 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/ledctl - from package: ledmon

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

On Debian possible default full paths are:

/usr/sbin/ledctl - from package: ledmon

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

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