fdpowermon: 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/fdpowermon - from package: fdpowermon

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

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