mhc-sync: 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/mhc-sync - from package: mhc-utils

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

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