eyeD3: 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/eyeD3 - from package: python-eyed3

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

On Debian possible default full paths are:

/usr/bin/eyeD3 - from package: eyed3

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

Error in other languages:
eyeD3: bevel nie gevind nie
eyeD3: comandă negăsită
eyeD3: comando não encontrado
eyeD3: commande introuvable
eyeD3: command not found
eyeD3: käsku ei ole
eyeD3: không tìm thấy lệnh
eyeD3: komanda nerasta
eyeD3: Kommando nicht gefunden.
eyeD3: kommandot finns inte
eyeD3: komut yok
eyeD3: nie znaleziono polecenia
eyeD3: níor aimsíodh an t-ordú
eyeD3: no se encontró la orden
eyeD3: no s'ha trobat l'ordre
eyeD3: opdracht niet gevonden
eyeD3: parancs nem található
eyeD3: perintah tidak ditemukan
eyeD3: príkaz nenájdený
eyeD3: příkaz nenalezen
eyeD3: команда не найдена
eyeD3: командата не е открита
eyeD3: 命令找不到
eyeD3: コマンドが見つかりません