lde: 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/lde - from package: lde

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

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