avibench: 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/avibench - from package: libavifile-0.7-bin

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

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