hot: 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/hot - from package: hopenpgp-tools

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

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