dellLEDCtl: 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/dellLEDCtl - from package: smbios-utils-bin

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

On Debian possible default full paths are:

/usr/sbin/dellLEDCtl - from package: smbios-utils

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

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