hexbox: 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/hexbox - from package: hexbox

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

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