auditctl: 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:

/sbin/auditctl - from package: audit

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

On Debian possible default full paths are:

/sbin/auditctl - from package: auditd

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

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