hdel: 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/hdel - from package: hfsutils

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

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