osirrox: 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/osirrox - from package: xorriso

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