dmitry: 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/dmitry - from package: dmitry

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

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