hyc2: 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/hyc2 - from package: python-hy

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

Error in other languages:
hyc2: bevel nie gevind nie
hyc2: comandă negăsită
hyc2: comando não encontrado
hyc2: commande introuvable
hyc2: command not found
hyc2: käsku ei ole
hyc2: không tìm thấy lệnh
hyc2: komanda nerasta
hyc2: Kommando nicht gefunden.
hyc2: kommandot finns inte
hyc2: komut yok
hyc2: nie znaleziono polecenia
hyc2: níor aimsíodh an t-ordú
hyc2: no se encontró la orden
hyc2: no s'ha trobat l'ordre
hyc2: opdracht niet gevonden
hyc2: parancs nem található
hyc2: perintah tidak ditemukan
hyc2: príkaz nenájdený
hyc2: příkaz nenalezen
hyc2: команда не найдена
hyc2: командата не е открита
hyc2: 命令找不到
hyc2: コマンドが見つかりません