mcpmv: 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/mcpmv - from package: mrename

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

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