avrdude: 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/avrdude - from package: avrdude

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

On Debian possible default full paths are:

/usr/bin/avrdude - from package: avrdude

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

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