mcv-long: 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-long - from package: scotch

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

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