hf77: 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/hf77 - from package: lam4-dev

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

Error in other languages:
hf77: bevel nie gevind nie
hf77: comandă negăsită
hf77: comando não encontrado
hf77: commande introuvable
hf77: command not found
hf77: käsku ei ole
hf77: không tìm thấy lệnh
hf77: komanda nerasta
hf77: Kommando nicht gefunden.
hf77: kommandot finns inte
hf77: komut yok
hf77: nie znaleziono polecenia
hf77: níor aimsíodh an t-ordú
hf77: no se encontró la orden
hf77: no s'ha trobat l'ordre
hf77: opdracht niet gevonden
hf77: parancs nem található
hf77: perintah tidak ditemukan
hf77: príkaz nenájdený
hf77: příkaz nenalezen
hf77: команда не найдена
hf77: командата не е открита
hf77: 命令找不到
hf77: コマンドが見つかりません