yamdi: 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/yamdi - from package: yamdi

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

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