hlfsd: 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 CentOS possible default full paths are:

/usr/sbin/hlfsd - from package: am-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/hlfsd - from package: am-utils

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

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