hcidump: 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/hcidump - from package: bluez-hcidump

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

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