auditd: 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/auditd - from package: audit

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

On Debian possible default full paths are:

/sbin/auditd - from package: auditd

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

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