hdevtools: 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/hdevtools - from package: hdevtools

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

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