nload: 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/nload - from package: nload

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

On Debian possible default full paths are:

/usr/bin/nload - from package: nload

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

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