hexbin: 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/hexbin - from package: macutils

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

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