wmcpuload: command not found

Have You tried accessing the binary with the full path?

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/wmcpuload - from package: wmcpuload

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