tudu: 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/tudu - from package: tudu

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

On Debian possible default full paths are:

/usr/bin/tudu - from package: tudu

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

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