mc.sh: 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/share/mc/bin/mc.sh - from package: mc

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

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