lysdr: 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/lysdr - from package: lysdr

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

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