hidrd-convert: command not found

Have You tried accessing the binary with the full path?

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/hidrd-convert - from package: hidrd

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