mydumper: 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/mydumper - from package: mydumper

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

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