mcv: 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/mcv - from package: scotch

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

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