audit2why: 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/audit2why - from package: policycoreutils-python

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

On Debian possible default full paths are:

/usr/bin/audit2why - from package: policycoreutils

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

Error in other languages:
audit2why: bevel nie gevind nie
audit2why: comandă negăsită
audit2why: comando não encontrado
audit2why: commande introuvable
audit2why: command not found
audit2why: käsku ei ole
audit2why: không tìm thấy lệnh
audit2why: komanda nerasta
audit2why: Kommando nicht gefunden.
audit2why: kommandot finns inte
audit2why: komut yok
audit2why: nie znaleziono polecenia
audit2why: níor aimsíodh an t-ordú
audit2why: no se encontró la orden
audit2why: no s'ha trobat l'ordre
audit2why: opdracht niet gevonden
audit2why: parancs nem található
audit2why: perintah tidak ditemukan
audit2why: príkaz nenájdený
audit2why: příkaz nenalezen
audit2why: команда не найдена
audit2why: командата не е открита
audit2why: 命令找不到
audit2why: コマンドが見つかりません