om-led: 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 Debian possible default full paths are:

/usr/bin/om-led - from package: omhacks

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

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