cat_nvram: 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/sbin/cat_nvram - from package: nvram-wakeup

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

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