mwc: 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/mwc - from package: mwc

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

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