morseOSS: 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/morseOSS - from package: morse

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

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