netmdcli: 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/netmdcli - from package: minidisc-utils

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

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