morseexec: 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/morseexec - from package: morse-simulator

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

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