iso-read: 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/bin/iso-read - from package: libcdio

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

On Debian possible default full paths are:

/usr/bin/iso-read - from package: libcdio-utils

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

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