mcopy: 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 CentOS possible default full paths are:

/usr/bin/mcopy - from package: mtools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mcopy - from package: mtools

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

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