avr-run: 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/avr-run - from package: avr-gdb

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

On Debian possible default full paths are:

/usr/bin/avr-run - from package: gdb-avr

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

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