ifmetric: 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/ifmetric - from package: ifmetric

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

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