audex: 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/audex - from package: audex

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

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