kid3: 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 Debian possible default full paths are:

/usr/bin/kid3 - from package: kid3

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

Error in other languages:
kid3: bevel nie gevind nie
kid3: comandă negăsită
kid3: comando não encontrado
kid3: commande introuvable
kid3: command not found
kid3: käsku ei ole
kid3: không tìm thấy lệnh
kid3: komanda nerasta
kid3: Kommando nicht gefunden.
kid3: kommandot finns inte
kid3: komut yok
kid3: nie znaleziono polecenia
kid3: níor aimsíodh an t-ordú
kid3: no se encontró la orden
kid3: no s'ha trobat l'ordre
kid3: opdracht niet gevonden
kid3: parancs nem található
kid3: perintah tidak ditemukan
kid3: príkaz nenájdený
kid3: příkaz nenalezen
kid3: команда не найдена
kid3: командата не е открита
kid3: 命令找不到
kid3: コマンドが見つかりません