audial: 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/audial - from package: nas

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

On Debian possible default full paths are:

/usr/bin/audial - from package: nas-bin

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

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